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Fair Value Measurements - Recurring Basis Hierarchy Leveling (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale $ 38,876.3 $ 36,888.8
Derivative Assets 3,387.7 2,563.5
Asset, Netting (2,338.0) (1,357.1)
Derivative Assets 1,049.7 1,206.4
Derivative Liabilities 3,313.0 2,388.4
Liability, Netting (1,618.4) (1,796.3)
Derivative Liabilities 1,694.6 592.1
Interest Rate Swaps Exchange Cleared    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Asset, Netting   (1.3)
Cross Product Collateral Adjustment    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Asset, Netting (1,136.8) (134.5)
Liability, Netting (417.2) (573.7)
LEVEL 2    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 34,300.0 31,700.0
Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 38,876.3 36,888.8
Trading Account 0.3 0.3
Total Available for Sale and Trading Debt Securities 38,876.6 36,889.1
Fair Value, Measurements, Recurring | Other Assets    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Asset, Netting (2,338.0) (1,357.1)
Derivative Assets 1,049.7 1,206.4
Fair Value, Measurements, Recurring | Other Assets | Foreign Exchange Contracts    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Asset, Netting (2,334.1) (1,308.8)
Derivative Assets 900.7 1,157.3
Fair Value, Measurements, Recurring | Other Assets | Interest Rate Contracts    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Asset, Netting (3.9) (47.0)
Derivative Assets 149.0 49.1
Fair Value, Measurements, Recurring | Other Assets | Interest Rate Swaps Exchange Cleared    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Asset, Netting   (1.3)
Derivative Assets   0.0
Fair Value, Measurements, Recurring | Other Liabilities    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Liability, Netting (1,618.4) (1,796.3)
Derivative Liabilities 1,694.6 592.1
Fair Value, Measurements, Recurring | Other Liabilities | Foreign Exchange Contracts    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Liability, Netting (1,548.6) (1,751.7)
Derivative Liabilities 1,633.6 510.8
Fair Value, Measurements, Recurring | Other Liabilities | Interest Rate Contracts    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Liability, Netting (57.3) (43.4)
Derivative Liabilities 40.1 49.7
Fair Value, Measurements, Recurring | Other Liabilities | Interest Rate Swaps Exchange Cleared    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Liability, Netting (12.5) (1.2)
Derivative Liabilities 20.9 31.6
Fair Value, Measurements, Recurring | LEVEL 1    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 4,549.1 5,185.3
Trading Account 0.0 0.0
Total Available for Sale and Trading Debt Securities 4,549.1 5,185.3
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 | Interest Rate Swaps Exchange Cleared    
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  
Derivative Liabilities   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 | Interest Rate Swaps Exchange Cleared    
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 34,327.2 31,703.5
Trading Account 0.3 0.3
Total Available for Sale and Trading Debt Securities 34,327.5 31,703.8
Fair Value, Measurements, Recurring | LEVEL 2 | Other Assets    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Assets 3,387.7 2,563.5
Fair Value, Measurements, Recurring | LEVEL 2 | Other Assets | Foreign Exchange Contracts    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Assets 3,234.8 2,466.1
Fair Value, Measurements, Recurring | LEVEL 2 | Other Assets | Interest Rate Contracts    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Assets 152.9 96.1
Fair Value, Measurements, Recurring | LEVEL 2 | Other Assets | Interest Rate Swaps Exchange Cleared    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Assets   1.3
Fair Value, Measurements, Recurring | LEVEL 2 | Other Liabilities    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Liabilities 3,279.6  
Derivative Liabilities   2,355.6
Fair Value, Measurements, Recurring | LEVEL 2 | Other Liabilities | Foreign Exchange Contracts    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Liabilities 3,182.2 2,262.5
Fair Value, Measurements, Recurring | LEVEL 2 | Other Liabilities | Interest Rate Contracts    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Liabilities 97.4 93.1
Fair Value, Measurements, Recurring | LEVEL 2 | Other Liabilities | Interest Rate Swaps Exchange Cleared    
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 | Interest Rate Swaps Exchange Cleared    
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 33.4  
Derivative Liabilities   32.8
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 | Interest Rate Swaps Exchange Cleared    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Liabilities 33.4 32.8
U.S. Government    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 4,549.1 5,185.3
U.S. Government | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 4,549.1 5,185.3
U.S. Government | Fair Value, Measurements, Recurring | LEVEL 1    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 4,549.1 5,185.3
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 1,615.3 655.9
Obligations of States and Political Subdivisions | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 1,615.3 655.9
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 1,615.3 655.9
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 23,271.2 22,424.6
Government Sponsored Agency | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 23,271.2 22,424.6
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 23,271.2 22,424.6
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 3.3 142.2
Non-U.S. Government | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 3.3 142.2
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 3.3 142.2
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 2,402.7 2,294.7
Corporate Debt | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 2,402.7 2,294.7
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 2,402.7 2,294.7
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 769.9 829.3
Covered Bonds | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 769.9 829.3
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 769.9 829.3
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 2,127.6 2,096.2
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 2,127.6 2,096.2
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 2,127.6 2,096.2
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 3,330.5 2,657.7
Other Asset-Backed | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 3,330.5 2,657.7
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 3,330.5 2,657.7
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 797.7 587.2
Commercial Mortgage-Backed | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 797.7 587.2
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 797.7 587.2
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
Other    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 9.0 15.7
Other | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 9.0 15.7
Other | 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 | Fair Value, Measurements, Recurring | LEVEL 2    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 9.0 15.7
Other | Fair Value, Measurements, Recurring | LEVEL 3    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale $ 0.0 $ 0.0