101 - Document - Document and Entity Information
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103 - Statement - Consolidated Balance Sheet
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104 - Statement - Consolidated Balance Sheet (Parenthetical)
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105 - Statement - Consolidated Statement of Income
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106 - Statement - Consolidated Statement of Comprehensive Income
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107 - Statement - Consolidated Statement of Income (Parenthetical)
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108 - Statement - Consolidated Statements of Changes in Stockholders' Equity
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109 - Statement - Consolidated Statement of Cash Flows
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110 - Disclosure - Basis of Presentation
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111 - Disclosure - Recent Accounting Pronouncements
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112 - Disclosure - Fair Value Measurements
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113 - Disclosure - Securities
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114 - Disclosure - Securities Sold Under Agreements to Repurchase
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115 - Disclosure - Loans and Leases
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116 - Disclosure - Allowance for Credit Losses
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117 - Disclosure - Pledged Assets
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118 - Disclosure - Goodwill and Other Intangibles
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119 - Disclosure - Reporting Segments
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120 - Disclosure - Stockholders' Equity
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121 - Disclosure - Accumulated Other Comprehensive Income (Loss)
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122 - Disclosure - Net Income Per Common Share Computations
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123 - Disclosure - Net Interest Income
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124 - Disclosure - Income Taxes
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125 - Disclosure - Pension and Postretirement Health Care
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126 - Disclosure - Share-Based Compensation Plans
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127 - Disclosure - Variable Interest Entities
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128 - Disclosure - Contingent Liabilities
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129 - Disclosure - Derivative Financial Instruments
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130 - Disclosure - Offsetting of Assets and Liabilities
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131 - Disclosure - Fair Value Measurements (Tables)
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132 - Disclosure - Securities (Tables)
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133 - Disclosure - Securities Sold Under Agreements to Repurchase (Tables)
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134 - Disclosure - Loans and Leases (Tables)
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135 - Disclosure - Allowance for Credit Losses (Tables)
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136 - Disclosure - Goodwill and Other Intangibles (Tables)
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137 - Disclosure - Reporting Segments (Tables)
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138 - Disclosure - Accumulated Other Comprehensive Income (Loss) (Tables)
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139 - Disclosure - Net Income Per Common Share Computations (Tables)
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140 - Disclosure - Net Interest Income (Tables)
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141 - Disclosure - Pension and Postretirement Health Care (Tables)
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142 - Disclosure - Share-Based Compensation Plans (Tables)
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143 - Disclosure - Derivative Financial Instruments (Tables)
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144 - Disclosure - Offsetting of Assets and Liabilities (Tables)
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145 - Disclosure - Fair Value Measurements - Additional Information (Detail)
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146 - Disclosure - Valuation Techniques, Significant Unobservable Inputs, and Quantitative Information (Detail)
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147 - Disclosure - Assets and Liabilities Measured at Fair Value on Recurring Basis Segregated by Fair Value Hierarchy Level (Detail)
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148 - Disclosure - Assets and Liabilities Measured at Fair Value on Recurring Basis Segregated by Fair Value Hierarchy Level (Parenthetical) (Detail)
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149 - Disclosure - Changes in Level 3 Assets (Detail)
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150 - Disclosure - Changes in Level 3 Liabilities (Detail)
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151 - Disclosure - Valuation Techniques, Significant Unobservable Inputs, Quantitative Information Non-recurring Basis (Detail)
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152 - Disclosure - Book and Fair Values of All Financial Instruments (Detail)
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153 - Disclosure - Reconciliation of Amortized Cost to Fair Value of Securities Available for Sale (Detail)
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154 - Disclosure - Reconciliation of Amortized Cost to Fair Values of Securities Held to Maturity (Detail)
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155 - Disclosure - Remaining Maturity of Securities Available for Sale and Held to Maturity (Detail)
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156 - Disclosure - Securities - Additional Information (Detail)
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157 - Disclosure - Securities Continuous Unrealized Loss Position (Detail)
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158 - Disclosure - Credit Related Impairment Losses Recognized in Earnings on Other Than Temporarily Impaired Securities (Detail)
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159 - Disclosure - Credit-Related Losses Recognized in Earnings on Debt Securities Other-Than-Temporarily Impaired (Detail)
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160 - Disclosure - Repurchase Agreements Accounted for as Secured Borrowings (Detail)
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161 - Disclosure - Amounts Outstanding for Loans and Leases by Segment and Class (Detail)
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162 - Disclosure - Loans and Leases - Additional Information (Detail)
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163 - Disclosure - Loan and Lease Segment and Class Balances Segregated by Borrower Ratings into "One to Three", "Four to Five" and "Six to Nine" (Watch List) Categories (Detail)
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164 - Disclosure - Balances and Delinquency Status of Performing and Nonperforming Loans and Leases by Segment and Class as well as Total OREO and Nonperforming Asset Balances (Detail)
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165 - Disclosure - Impaired Loans by Segment and Class (Detail)
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166 - Disclosure - Number of Loans and Leases Modified in TDRs and Total Recorded Investments and Unpaid Principal Balances (Detail)
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167 - Disclosure - Changes in Allowance for Credit Losses by Segment (Detail)
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168 - Disclosure - Allowances for Credit Losses and Recorded Investments in Loans and Leases by Segment (Detail)
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169 - Disclosure - Pledged Assets - Additional Information (Detail)
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170 - Disclosure - Changes by Reporting Segment in Carrying Amounts of Goodwill, including Effect of Foreign Exchange Rates on Non-U.S.-Dollar-Denominated Balances (Detail)
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171 - Disclosure - Other Intangible Assets Subject to Amortization (Detail)
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172 - Disclosure - Goodwill and Other Intangibles - Additional Information (Detail)
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173 - Disclosure - Earnings Contribution of Northern Trust's Reporting Segments (Detail)
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174 - Disclosure - Earnings Contribution of Northern Trust's Reporting Segments (Parenthetical) (Detail)
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175 - Disclosure - Stockholders' Equity - Additional Information (Detail)
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176 - Disclosure - Components of Accumulated Other Comprehensive Income (Loss) (AOCI) (Detail)
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177 - Disclosure - Accumulated Other Comprehensive Income (Loss) Changes During Period (Detail)
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178 - Disclosure - Reclassification Adjustments out of Accumulated Other Comprehensive Income (Loss) (Detail)
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179 - Disclosure - Computations of Net Income Per Common Share (Detail)
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180 - Disclosure - Computations of Net Income Per Common Share (Parenthetical) (Detail)
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181 - Disclosure - Components of Net Interest Income (Detail)
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182 - Disclosure - Components of Net Interest Income (Parenthetical) (Detail)
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183 - Disclosure - Income Taxes - Additional Information (Detail)
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184 - Disclosure - Components of Company's Net Periodic Benefit Cost (Detail)
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185 - Disclosure - Compensation Expense for Share-Based Payment Arrangements and Associated Tax Impacts (Detail)
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186 - Disclosure - Variable Interest Entities - Additional Information (Detail)
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187 - Disclosure - Contingent Liabilities - Additional Information (Detail)
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188 - Disclosure - Derivative Financial Instruments - Additional Information (Detail)
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189 - Disclosure - Notional and Fair Value Amounts of Client-related and Trading Derivative Financial Instruments (Detail)
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190 - Disclosure - Gains and Losses Recorded in Consolidated Statements of Income Related to Client Related and Trading Derivative Financial Instruments (Detail)
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191 - Disclosure - Types and Classifications of Derivative Instruments Designated as Hedges (Detail)
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192 - Disclosure - Gains and Losses Recorded in Consolidated Statements of Income Related to Fair Value Hedges (Detail)
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193 - Disclosure - Cash Flow Hedge Derivative Gains and Losses Recognized in AOCI and the Amounts Reclassified to Earnings (Detail)
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194 - Disclosure - Net Investment Hedge Gains and Losses Recognized in AOCI (Detail)
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195 - Disclosure - Types of Risk Management Derivative Instruments Not Formally Designated as Hedges and Their Notional Amounts and Fair Values (Detail)
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196 - Disclosure - Gains and Losses Recorded in Consolidated Statements of Income related to Derivative Instruments Not Formally Designated as Hedges (Detail)
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197 - Disclosure - Offsetting of Derivative Assets and of Securities Purchased Under Agreements to Resell Within Consolidated Balance Sheets (Detail)
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198 - Disclosure - Offsetting of Derivative Assets and of Securities Purchased Under Agreements to Resell Within Consolidated Balance Sheets (Parenthetical) (Detail)
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199 - Disclosure - Offsetting of Derivative Liabilities and of Securities Sold Under Agreements to Repurchase Within Consolidated Balance Sheet (Detail)
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200 - Disclosure - Offsetting of Derivative Liabilities and of Securities Sold Under Agreements to Repurchase Within Consolidated Balance Sheet (Parenthetical) (Detail)
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