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Fair Value Measurements (Recurring Basis Hierarchy Leveling) (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale (Amortized cost of $39,025.3 and $38,722.2) $ 39,441.7 $ 38,876.3
Derivative Assets 6,276.9 3,387.7
NETTING (2,065.8) (2,338.0)
Derivative Asset 4,211.1 1,049.7
Derivative Liabilities 5,950.0 3,313.0
NETTING (4,890.2) (1,618.4)
Derivative Liabilities 1,059.8 1,694.6
Cross Product Collateral Adjustment    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
NETTING (197.6) (1,136.8)
NETTING (3,022.0) (417.2)
U.S. Government    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale (Amortized cost of $39,025.3 and $38,722.2) 4,584.1 4,549.1
Obligations of States and Political Subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale (Amortized cost of $39,025.3 and $38,722.2) 1,776.3 1,615.3
Government Sponsored Agency    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale (Amortized cost of $39,025.3 and $38,722.2) 23,870.0 23,271.2
Non-U.S. Government    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale (Amortized cost of $39,025.3 and $38,722.2) 3.4 3.3
Corporate Debt    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale (Amortized cost of $39,025.3 and $38,722.2) 2,436.0 2,402.7
Covered Bonds    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale (Amortized cost of $39,025.3 and $38,722.2) 553.4 769.9
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale (Amortized cost of $39,025.3 and $38,722.2) 2,105.5 2,127.6
Other Asset-Backed    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale (Amortized cost of $39,025.3 and $38,722.2) 3,182.1 3,330.5
Commercial Mortgage-Backed    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale (Amortized cost of $39,025.3 and $38,722.2) 922.6 797.7
Other    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale (Amortized cost of $39,025.3 and $38,722.2) 8.3 9.0
LEVEL 2    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale (Amortized cost of $39,025.3 and $38,722.2) 34,900.0 34,300.0
Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale (Amortized cost of $39,025.3 and $38,722.2) 39,441.7 38,876.3
Trading Account 1.2 0.3
Total Available for Sale and Trading Debt Securities 39,442.9 38,876.6
Fair Value, Measurements, Recurring | U.S. Government    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale (Amortized cost of $39,025.3 and $38,722.2) 4,584.1 4,549.1
Fair Value, Measurements, Recurring | Obligations of States and Political Subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale (Amortized cost of $39,025.3 and $38,722.2) 1,776.3 1,615.3
Fair Value, Measurements, Recurring | Government Sponsored Agency    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale (Amortized cost of $39,025.3 and $38,722.2) 23,870.0 23,271.2
Fair Value, Measurements, Recurring | Non-U.S. Government    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale (Amortized cost of $39,025.3 and $38,722.2) 3.4 3.3
Fair Value, Measurements, Recurring | Corporate Debt    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale (Amortized cost of $39,025.3 and $38,722.2) 2,436.0 2,402.7
Fair Value, Measurements, Recurring | Covered Bonds    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale (Amortized cost of $39,025.3 and $38,722.2) 553.4 769.9
Fair Value, Measurements, Recurring | Sub-Sovereign, Supranational and Non-U.S. Agency Bonds    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale (Amortized cost of $39,025.3 and $38,722.2) 2,105.5 2,127.6
Fair Value, Measurements, Recurring | Other Asset-Backed    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale (Amortized cost of $39,025.3 and $38,722.2) 3,182.1 3,330.5
Fair Value, Measurements, Recurring | Commercial Mortgage-Backed    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale (Amortized cost of $39,025.3 and $38,722.2) 922.6 797.7
Fair Value, Measurements, Recurring | Other    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale (Amortized cost of $39,025.3 and $38,722.2) 8.3 9.0
Fair Value, Measurements, Recurring | Other Assets    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
NETTING (2,065.8) (2,338.0)
Derivative Asset 4,211.1 1,049.7
Fair Value, Measurements, Recurring | Other Assets | Foreign Exchange Contracts    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
NETTING (2,062.6) (2,334.1)
Derivative Asset 3,872.8 900.7
Fair Value, Measurements, Recurring | Other Assets | Interest Rate Contracts    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
NETTING (3.2) (3.9)
Derivative Asset 338.3 149.0
Fair Value, Measurements, Recurring | Other Liabilities    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
NETTING (4,890.2) (1,618.4)
Derivative Liabilities 1,059.8 1,694.6
Fair Value, Measurements, Recurring | Other Liabilities | Foreign Exchange Contracts    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
NETTING (4,763.3) (1,548.6)
Derivative Liabilities 1,000.1 1,633.6
Fair Value, Measurements, Recurring | Other Liabilities | Interest Rate Contracts    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
NETTING (126.9) (57.3)
Derivative Liabilities 33.2 40.1
Fair Value, Measurements, Recurring | Other Liabilities | Other Financial Derivatives    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
NETTING 0.0 (12.5)
Derivative Liabilities 26.5 20.9
Fair Value, Measurements, Recurring | LEVEL 1    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale (Amortized cost of $39,025.3 and $38,722.2) 4,584.1 4,549.1
Trading Account 0.0 0.0
Total Available for Sale and Trading Debt Securities 4,584.1 4,549.1
Fair Value, Measurements, Recurring | LEVEL 1 | U.S. Government    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale (Amortized cost of $39,025.3 and $38,722.2) 4,584.1 4,549.1
Fair Value, Measurements, Recurring | LEVEL 1 | Obligations of States and Political Subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale (Amortized cost of $39,025.3 and $38,722.2) 0.0 0.0
Fair Value, Measurements, Recurring | LEVEL 1 | Government Sponsored Agency    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale (Amortized cost of $39,025.3 and $38,722.2) 0.0 0.0
Fair Value, Measurements, Recurring | LEVEL 1 | Non-U.S. Government    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale (Amortized cost of $39,025.3 and $38,722.2) 0.0 0.0
Fair Value, Measurements, Recurring | LEVEL 1 | Corporate Debt    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale (Amortized cost of $39,025.3 and $38,722.2) 0.0 0.0
Fair Value, Measurements, Recurring | LEVEL 1 | Covered Bonds    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale (Amortized cost of $39,025.3 and $38,722.2) 0.0 0.0
Fair Value, Measurements, Recurring | LEVEL 1 | Sub-Sovereign, Supranational and Non-U.S. Agency Bonds    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale (Amortized cost of $39,025.3 and $38,722.2) 0.0 0.0
Fair Value, Measurements, Recurring | LEVEL 1 | Other Asset-Backed    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale (Amortized cost of $39,025.3 and $38,722.2) 0.0 0.0
Fair Value, Measurements, Recurring | LEVEL 1 | Commercial Mortgage-Backed    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale (Amortized cost of $39,025.3 and $38,722.2) 0.0 0.0
Fair Value, Measurements, Recurring | LEVEL 1 | Other    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale (Amortized cost of $39,025.3 and $38,722.2) 0.0 0.0
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 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 (Amortized cost of $39,025.3 and $38,722.2) 34,857.6 34,327.2
Trading Account 1.2 0.3
Total Available for Sale and Trading Debt Securities 34,858.8 34,327.5
Fair Value, Measurements, Recurring | LEVEL 2 | U.S. Government    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale (Amortized cost of $39,025.3 and $38,722.2) 0.0 0.0
Fair Value, Measurements, Recurring | LEVEL 2 | Obligations of States and Political Subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale (Amortized cost of $39,025.3 and $38,722.2) 1,776.3 1,615.3
Fair Value, Measurements, Recurring | LEVEL 2 | Government Sponsored Agency    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale (Amortized cost of $39,025.3 and $38,722.2) 23,870.0 23,271.2
Fair Value, Measurements, Recurring | LEVEL 2 | Non-U.S. Government    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale (Amortized cost of $39,025.3 and $38,722.2) 3.4 3.3
Fair Value, Measurements, Recurring | LEVEL 2 | Corporate Debt    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale (Amortized cost of $39,025.3 and $38,722.2) 2,436.0 2,402.7
Fair Value, Measurements, Recurring | LEVEL 2 | Covered Bonds    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale (Amortized cost of $39,025.3 and $38,722.2) 553.4 769.9
Fair Value, Measurements, Recurring | LEVEL 2 | Sub-Sovereign, Supranational and Non-U.S. Agency Bonds    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale (Amortized cost of $39,025.3 and $38,722.2) 2,105.5 2,127.6
Fair Value, Measurements, Recurring | LEVEL 2 | Other Asset-Backed    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale (Amortized cost of $39,025.3 and $38,722.2) 3,182.1 3,330.5
Fair Value, Measurements, Recurring | LEVEL 2 | Commercial Mortgage-Backed    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale (Amortized cost of $39,025.3 and $38,722.2) 922.6 797.7
Fair Value, Measurements, Recurring | LEVEL 2 | Other    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale (Amortized cost of $39,025.3 and $38,722.2) 8.3 9.0
Fair Value, Measurements, Recurring | LEVEL 2 | Other Assets    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Assets 6,276.9 3,387.7
Fair Value, Measurements, Recurring | LEVEL 2 | Other Assets | Foreign Exchange Contracts    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Assets 5,935.4 3,234.8
Fair Value, Measurements, Recurring | LEVEL 2 | Other Assets | Interest Rate Contracts    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Assets 341.5 152.9
Fair Value, Measurements, Recurring | LEVEL 2 | Other Liabilities    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Liabilities 5,923.5 3,279.6
Fair Value, Measurements, Recurring | LEVEL 2 | Other Liabilities | Foreign Exchange Contracts    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Liabilities 5,763.4 3,182.2
Fair Value, Measurements, Recurring | LEVEL 2 | Other Liabilities | Interest Rate Contracts    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Liabilities 160.1 97.4
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 (Amortized cost of $39,025.3 and $38,722.2) 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 | U.S. Government    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale (Amortized cost of $39,025.3 and $38,722.2) 0.0 0.0
Fair Value, Measurements, Recurring | LEVEL 3 | Obligations of States and Political Subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale (Amortized cost of $39,025.3 and $38,722.2) 0.0 0.0
Fair Value, Measurements, Recurring | LEVEL 3 | Government Sponsored Agency    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale (Amortized cost of $39,025.3 and $38,722.2) 0.0 0.0
Fair Value, Measurements, Recurring | LEVEL 3 | Non-U.S. Government    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale (Amortized cost of $39,025.3 and $38,722.2) 0.0 0.0
Fair Value, Measurements, Recurring | LEVEL 3 | Corporate Debt    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale (Amortized cost of $39,025.3 and $38,722.2) 0.0 0.0
Fair Value, Measurements, Recurring | LEVEL 3 | Covered Bonds    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale (Amortized cost of $39,025.3 and $38,722.2) 0.0 0.0
Fair Value, Measurements, Recurring | LEVEL 3 | Sub-Sovereign, Supranational and Non-U.S. Agency Bonds    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale (Amortized cost of $39,025.3 and $38,722.2) 0.0 0.0
Fair Value, Measurements, Recurring | LEVEL 3 | Other Asset-Backed    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale (Amortized cost of $39,025.3 and $38,722.2) 0.0 0.0
Fair Value, Measurements, Recurring | LEVEL 3 | Commercial Mortgage-Backed    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale (Amortized cost of $39,025.3 and $38,722.2) 0.0 0.0
Fair Value, Measurements, Recurring | LEVEL 3 | Other    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale (Amortized cost of $39,025.3 and $38,722.2) 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 Liabilities    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Liabilities 26.5 33.4
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 $ 26.5 $ 33.4