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Regulatory Capital Requirements (Tables)
 12 Months Ended
Dec. 31, 2021
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 139: RISK-BASED AND LEVERAGE CAPITAL AMOUNTS AND RATIOS
DECEMBER 31, 2021DECEMBER 31, 2020
($ In Millions)STANDARDIZED APPROACHADVANCED APPROACHSTANDARDIZED APPROACHADVANCED
APPROACH
BALANCERATIOBALANCERATIOBALANCERATIOBALANCERATIO
Common Equity Tier 1 Capital
Northern Trust Corporation$10,277.1 11.9 %$10,277.1 13.2 %$9,962.2 12.8 %$9,962.2 13.4 %
The Northern Trust Company10,315.7 12.0 10,315.7 13.5 10,003.3 13.0 10,003.3 13.8 
Minimum to qualify as well-capitalized:
Northern Trust CorporationN/AN/AN/AN/AN/AN/AN/AN/A
The Northern Trust Company5,578.7 6.5 4,964.5 6.5 4,994.4 6.5 4,717.1 6.5 
Tier 1 Capital
Northern Trust Corporation11,142.2 12.9 11,142.2 14.3 10,822.2 13.9 10,822.2 14.5 
The Northern Trust Company10,315.7 12.0 10,315.7 13.5 10,003.3 13.0 10,003.3 13.8 
Minimum to qualify as well-capitalized:
Northern Trust Corporation5,177.6 6.0 4,668.4 6.0 4,659.7 6.0 4,467.6 6.0 
The Northern Trust Company6,866.1 8.0 6,110.2 8.0 6,147.0 8.0 5,805.6 8.0 
Total Capital
Northern Trust Corporation12,126.8 14.1 11,942.0 15.3 12,085.7 15.6 11,825.8 15.9 
The Northern Trust Company11,158.4 13.0 10,973.7 14.4 11,123.1 14.5 10,863.3 15.0 
Minimum to qualify as well-capitalized:
Northern Trust Corporation8,629.3 10.0 7,780.7 10.0 7,766.2 10.0 7,446.0 10.0 
The Northern Trust Company8,582.6 10.0 7,637.8 10.0 7,683.7 10.0 7,257.0 10.0 
Tier 1 Leverage
Northern Trust Corporation11,142.2 6.9 11,142.2 6.9 10,822.2 7.6 10,822.2 7.6 
The Northern Trust Company10,315.7 6.4 10,315.7 6.4 10,003.3 7.0 10,003.3 7.0 
Minimum to qualify as well-capitalized:
Northern Trust CorporationN/AN/AN/AN/AN/AN/AN/AN/A
The Northern Trust Company8,019.5 5.0 8,019.5 5.0 7,105.0 5.0 7,105.0 5.0 
Supplementary Leverage(1)
Northern Trust CorporationN/AN/A11,142.2 8.2 N/AN/A10,822.2 8.6 
The Northern Trust CompanyN/AN/A10,315.7 7.6 N/AN/A10,003.3 7.7 
Minimum to qualify as well-capitalized:
Northern Trust CorporationN/AN/AN/AN/AN/AN/AN/AN/A
The Northern Trust CompanyN/AN/A4,081.7 3.0 N/AN/A3,883.4 3.0 
(1) In November 2019, the Federal Reserve Board 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 the Corporation and the Bank, 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 Board issued an interim final rule that requires bank holding companies, including the Corporation, to deduct, on a temporary basis, deposits with the Federal Reserve Board 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 expired on April 1, 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 Board and investments in U.S. Treasury securities from their total leverage exposure. The Bank did not elect to take this deduction.
The supplementary leverage ratios at December 31, 2021 and December 31, 2020 for the Corporation and the Bank reflect the impact of these final rules.