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Regulatory Capital Requirements (Tables)
 12 Months Ended
Dec. 31, 2020
Regulatory Capital Requirements Abstract [Abstract]  
Risk-Based Capital Amounts and Ratios for Northern Trust on Consolidated Basis and for Bank
The following table provides capital ratios for the Corporation and the Bank determined by Basel III phased in requirements.

TABLE 143: RISK-BASED AND LEVERAGE CAPITAL AMOUNTS AND RATIOS
DECEMBER 31, 2020DECEMBER 31, 2019
($ In Millions)STANDARDIZED APPROACHADVANCED APPROACHSTANDARDIZED APPROACHADVANCED
APPROACH
BALANCERATIOBALANCERATIOBALANCERATIOBALANCERATIO
Common Equity Tier 1 Capital
Northern Trust Corporation$9,962.2 12.8 %$9,962.2 13.4 %$8,898.7 12.7 %$8,898.7 13.2 %
The Northern Trust Company10,003.3 13.0 10,003.3 13.8 8,476.0 12.3 8,476.0 13.0 
Minimum to qualify as well-capitalized:
Northern Trust CorporationN/AN/AN/AN/AN/AN/AN/AN/A
The Northern Trust Company4,994.4 6.5 4,717.1 6.5 4,472.0 6.5 4,230.0 6.5 
Tier 1 Capital
Northern Trust Corporation10,822.2 13.9 10,822.2 14.5 10,152.0 14.5 10,152.0 15.0 
The Northern Trust Company10,003.3 13.0 10,003.3 13.8 8,476.0 12.3 8,476.0 13.0 
Minimum to qualify as well-capitalized:
Northern Trust Corporation4,659.7 6.0 4,467.6 6.0 4,205.3 6.0 4,051.6 6.0 
The Northern Trust Company6,147.0 8.0 5,805.6 8.0 5,504.0 8.0 5,206.2 8.0 
Total Capital
Northern Trust Corporation12,085.7 15.6 11,825.8 15.9 11,456.7 16.3 11,332.3 16.8 
The Northern Trust Company11,123.1 14.5 10,863.3 15.0 9,610.4 14.0 9,486.0 14.6 
Minimum to qualify as well-capitalized:
Northern Trust Corporation7,766.2 10.0 7,446.0 10.0 7,008.8 10.0 6,752.7 10.0 
The Northern Trust Company7,683.7 10.0 7,257.0 10.0 6,880.1 10.0 6,507.7 10.0 
Tier 1 Leverage
Northern Trust Corporation10,822.2 7.6 10,822.2 7.6 10,152.0 8.7 10,152.0 8.7 
The Northern Trust Company10,003.3 7.0 10,003.3 7.0 8,476.0 7.3 8,476.0 7.3 
Minimum to qualify as well-capitalized:
Northern Trust CorporationN/AN/AN/AN/AN/AN/AN/AN/A
The Northern Trust Company7,105.0 5.0 7,105.0 5.0 5,835.4 5.0 5,835.4 5.0 
Supplementary Leverage(1)
Northern Trust CorporationN/AN/A10,822.2 8.6 N/AN/A10,152.0 7.6 
The Northern Trust CompanyN/AN/A10,003.3 7.7 N/AN/A8,476.0 6.4 
Minimum to qualify as well-capitalized:
Northern Trust CorporationN/AN/AN/AN/AN/AN/AN/AN/A
The Northern Trust CompanyN/AN/A3,883.4 3.0 N/AN/A3,983.6 3.0 
(1) In November 2019, the Federal Reserve and other U.S. federal banking agencies adopted a final rule that established a deduction for central bank deposits from the total leverage exposures of custodial banking organizations, including Northern Trust Corporation and The Northern Trust Company, equal to the lesser of (i) the total amount of funds the custodial banking organization and its consolidated subsidiaries have on deposit at qualifying central banks and (ii) the total amount of client funds on deposit at the custodial banking organization that are linked to fiduciary or custodial and safekeeping accounts. The rule became effective on April 1, 2020.
Further, on April 1, 2020, the Federal Reserve issued an interim final rule that requires bank holding companies, including Northern Trust Corporation, to deduct, on a temporary basis, deposits with the Federal Reserve and investments in U.S. Treasury securities from their total leverage exposure. The U.S. Treasury securities deduction is applied in addition to the central bank deposits relief referred to above. This rule became effective on April 1, 2020 and will remain in effect through the first quarter of 2021. On May 15, 2020, the U.S. federal banking agencies released an interim final rule that permits insured depository institutions of bank holding companies also to temporarily exclude deposits with the Federal Reserve and investments in U.S. Treasury securities from their total leverage exposure. The Northern Trust Company did not elect to take this deduction.
The supplementary leverage ratios at December 31, 2020 for the Northern Trust Corporation and The Northern Trust Company reflect the impact of these final rules.