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Fair Value Measurements - Recurring Basis Hierarchy Leveling (Detail) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for sale $ 26,699.9 $ 38,010.5
Derivative Assets 3,732.4 2,347.4
Asset, Netting (2,810.7) (1,533.8)
Derivative Assets $ 921.7 $ 813.6
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Other Assets Other Assets
Derivative Liabilities $ 3,654.1 $ 2,135.2
Liability, Netting (1,865.9) (1,283.5)
Derivative Liabilities $ 1,788.2 $ 851.7
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Other Liabilities Other Liabilities
Cross Product Collateral Adjustment    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Asset, Netting $ (1,140.2) $ (389.4)
Liability, Netting (195.3) (139.0)
LEVEL 2    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for sale 24,000.0 35,600.0
Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for sale 26,699.9 38,010.5
Trading Account 95.2 0.3
Total Available for Sale and Trading Debt Securities 26,795.1 38,010.8
Fair Value, Measurements, Recurring | Other Assets    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Asset, Netting (2,810.7) (1,533.8)
Derivative Assets 921.7 813.6
Fair Value, Measurements, Recurring | Other Assets | Foreign Exchange Contracts    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Asset, Netting (2,666.4) (1,530.7)
Derivative Assets 843.7 676.7
Fair Value, Measurements, Recurring | Other Assets | Interest Rate Contracts    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Asset, Netting (144.3) (3.1)
Derivative Assets 77.7 136.9
Fair Value, Measurements, Recurring | Other Assets | Other Financial Derivatives    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Asset, Netting 0.0  
Derivative Assets 0.3  
Fair Value, Measurements, Recurring | Other Liabilities    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Liability, Netting (1,865.9) (1,283.5)
Derivative Liabilities 1,788.2 851.7
Fair Value, Measurements, Recurring | Other Liabilities | Foreign Exchange Contracts    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Liability, Netting (1,826.7) (1,234.5)
Derivative Liabilities 1,360.8 764.3
Fair Value, Measurements, Recurring | Other Liabilities | Interest Rate Contracts    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Liability, Netting (5.9) (48.1)
Derivative Liabilities 425.9 50.8
Fair Value, Measurements, Recurring | Other Liabilities | Other Financial Derivatives    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Liability, Netting (33.3) (0.9)
Derivative Liabilities 1.5 36.6
Fair Value, Measurements, Recurring | LEVEL 1    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for sale 2,747.4 2,426.1
Trading Account 95.0 0.0
Total Available for Sale and Trading Debt Securities 2,842.4 2,426.1
Fair Value, Measurements, Recurring | LEVEL 1 | Other Assets    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Assets 0.0 0.0
Fair Value, Measurements, Recurring | LEVEL 1 | Other Assets | Foreign Exchange Contracts    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Assets 0.0 0.0
Fair Value, Measurements, Recurring | LEVEL 1 | Other Assets | Interest Rate Contracts    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Assets 0.0 0.0
Fair Value, Measurements, Recurring | LEVEL 1 | Other Assets | Other Financial Derivatives    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Assets 0.0  
Fair Value, Measurements, Recurring | LEVEL 1 | Other Liabilities    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Liabilities 0.0 0.0
Fair Value, Measurements, Recurring | LEVEL 1 | Other Liabilities | Foreign Exchange Contracts    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Liabilities 0.0 0.0
Fair Value, Measurements, Recurring | LEVEL 1 | Other Liabilities | Interest Rate Contracts    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Liabilities 0.0 0.0
Fair Value, Measurements, Recurring | LEVEL 1 | Other Liabilities | Other Financial Derivatives    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Liabilities 0.0 0.0
Fair Value, Measurements, Recurring | LEVEL 2    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for sale 23,952.5 35,584.4
Trading Account 0.2 0.3
Total Available for Sale and Trading Debt Securities 23,952.7 35,584.7
Fair Value, Measurements, Recurring | LEVEL 2 | Other Assets    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Assets 3,732.4 2,347.4
Fair Value, Measurements, Recurring | LEVEL 2 | Other Assets | Foreign Exchange Contracts    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Assets 3,510.1 2,207.4
Fair Value, Measurements, Recurring | LEVEL 2 | Other Assets | Interest Rate Contracts    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Assets 222.0 140.0
Fair Value, Measurements, Recurring | LEVEL 2 | Other Assets | Other Financial Derivatives    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Assets 0.3  
Fair Value, Measurements, Recurring | LEVEL 2 | Other Liabilities    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Liabilities 3,619.3 2,097.7
Fair Value, Measurements, Recurring | LEVEL 2 | Other Liabilities | Foreign Exchange Contracts    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Liabilities 3,187.5 1,998.8
Fair Value, Measurements, Recurring | LEVEL 2 | Other Liabilities | Interest Rate Contracts    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Liabilities 431.8 98.9
Fair Value, Measurements, Recurring | LEVEL 2 | Other Liabilities | Other Financial Derivatives    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Liabilities 0.0 0.0
Fair Value, Measurements, Recurring | LEVEL 3    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for sale 0.0 0.0
Trading Account 0.0 0.0
Total Available for Sale and Trading Debt Securities 0.0 0.0
Fair Value, Measurements, Recurring | LEVEL 3 | Other Assets    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Assets 0.0 0.0
Fair Value, Measurements, Recurring | LEVEL 3 | Other Assets | Foreign Exchange Contracts    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Assets 0.0 0.0
Fair Value, Measurements, Recurring | LEVEL 3 | Other Assets | Interest Rate Contracts    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Assets 0.0 0.0
Fair Value, Measurements, Recurring | LEVEL 3 | Other Assets | Other Financial Derivatives    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Assets 0.0  
Fair Value, Measurements, Recurring | LEVEL 3 | Other Liabilities    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Liabilities 34.8 37.5
Fair Value, Measurements, Recurring | LEVEL 3 | Other Liabilities | Foreign Exchange Contracts    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Liabilities 0.0 0.0
Fair Value, Measurements, Recurring | LEVEL 3 | Other Liabilities | Interest Rate Contracts    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Liabilities 0.0 0.0
Fair Value, Measurements, Recurring | LEVEL 3 | Other Liabilities | Other Financial Derivatives    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Liabilities 34.8 37.5
U.S. Government    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for sale 2,747.4 2,426.1
U.S. Government | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for sale 2,747.4 2,426.1
U.S. Government | Fair Value, Measurements, Recurring | LEVEL 1    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for sale 2,747.4 2,426.1
U.S. Government | Fair Value, Measurements, Recurring | LEVEL 2    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for sale 0.0 0.0
U.S. Government | Fair Value, Measurements, Recurring | LEVEL 3    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for sale 0.0 0.0
Obligations of States and Political Subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for sale 787.6 3,876.1
Obligations of States and Political Subdivisions | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for sale 787.6 3,876.1
Obligations of States and Political Subdivisions | Fair Value, Measurements, Recurring | LEVEL 1    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for sale 0.0 0.0
Obligations of States and Political Subdivisions | Fair Value, Measurements, Recurring | LEVEL 2    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for sale 787.6 3,876.1
Obligations of States and Political Subdivisions | Fair Value, Measurements, Recurring | LEVEL 3    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for sale 0.0 0.0
Government Sponsored Agency    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for sale 11,545.2 18,075.6
Government Sponsored Agency | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for sale 11,545.2 18,075.6
Government Sponsored Agency | Fair Value, Measurements, Recurring | LEVEL 1    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for sale 0.0 0.0
Government Sponsored Agency | Fair Value, Measurements, Recurring | LEVEL 2    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for sale 11,545.2 18,075.6
Government Sponsored Agency | Fair Value, Measurements, Recurring | LEVEL 3    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for sale 0.0 0.0
Non-U.S. Government    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for sale 360.0 374.0
Non-U.S. Government | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for sale 360.0 374.0
Non-U.S. Government | Fair Value, Measurements, Recurring | LEVEL 1    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for sale 0.0 0.0
Non-U.S. Government | Fair Value, Measurements, Recurring | LEVEL 2    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for sale 360.0 374.0
Non-U.S. Government | Fair Value, Measurements, Recurring | LEVEL 3    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for sale 0.0 0.0
Corporate Debt    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for sale 1,747.6 2,341.7
Corporate Debt | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for sale 1,747.6 2,341.7
Corporate Debt | Fair Value, Measurements, Recurring | LEVEL 1    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for sale 0.0 0.0
Corporate Debt | Fair Value, Measurements, Recurring | LEVEL 2    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for sale 1,747.6 2,341.7
Corporate Debt | Fair Value, Measurements, Recurring | LEVEL 3    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for sale 0.0 0.0
Covered Bonds    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for sale 388.7 505.6
Covered Bonds | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for sale 388.7 505.6
Covered Bonds | Fair Value, Measurements, Recurring | LEVEL 1    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for sale 0.0 0.0
Covered Bonds | Fair Value, Measurements, Recurring | LEVEL 2    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for sale 388.7 505.6
Covered Bonds | Fair Value, Measurements, Recurring | LEVEL 3    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for sale 0.0 0.0
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for sale 2,479.4 3,045.1
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for sale 2,479.4 3,045.1
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds | Fair Value, Measurements, Recurring | LEVEL 1    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for sale 0.0 0.0
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds | Fair Value, Measurements, Recurring | LEVEL 2    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for sale 2,479.4 3,045.1
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds | Fair Value, Measurements, Recurring | LEVEL 3    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for sale 0.0 0.0
Other Asset-Backed    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for sale 5,256.2 5,941.6
Other Asset-Backed | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for sale 5,256.2 5,941.6
Other Asset-Backed | Fair Value, Measurements, Recurring | LEVEL 1    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for sale 0.0 0.0
Other Asset-Backed | Fair Value, Measurements, Recurring | LEVEL 2    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for sale 5,256.2 5,941.6
Other Asset-Backed | Fair Value, Measurements, Recurring | LEVEL 3    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for sale 0.0 0.0
Commercial Mortgage-Backed    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for sale 1,387.8 1,424.7
Commercial Mortgage-Backed | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for sale 1,387.8 1,424.7
Commercial Mortgage-Backed | Fair Value, Measurements, Recurring | LEVEL 1    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for sale 0.0 0.0
Commercial Mortgage-Backed | Fair Value, Measurements, Recurring | LEVEL 2    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for sale 1,387.8 1,424.7
Commercial Mortgage-Backed | Fair Value, Measurements, Recurring | LEVEL 3    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for sale $ 0.0 $ 0.0