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Fair Value Measurements (Recurring Basis Hierarchy Leveling) (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale $ 36,864.0 $ 42,022.0
Derivative Assets 2,816.3 4,558.2
NETTING (886.8) (3,507.8)
Derivative Assets 1,929.5 1,050.4
Derivative Liabilities 2,550.9 4,882.8
NETTING (2,088.3) (2,817.1)
Derivative Liabilities 462.6 2,065.7
Cross Product Collateral Adjustment    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
NETTING (126.4) (1,867.8)
NETTING (1,327.9) (1,177.2)
U.S. Government    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 2,559.0 2,799.9
Obligations of States and Political Subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 3,488.9 3,083.6
Government Sponsored Agency    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 17,645.8 24,956.7
Non-U.S. Government    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 623.8 714.0
Corporate Debt    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 2,462.9 2,539.6
Covered Bonds    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 535.4 553.1
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 3,058.5 2,345.8
Other Asset-Backed    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 5,278.1 3,997.5
Commercial Mortgage-Backed    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 1,211.6 1,031.8
LEVEL 2    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 34,300.0 39,200.0
Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 36,864.0 42,022.0
Trading Account 0.5 0.5
Total Available for Sale and Trading Debt Securities 36,864.5 42,022.5
Fair Value, Measurements, Recurring | U.S. Government    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 2,559.0 2,799.9
Fair Value, Measurements, Recurring | Obligations of States and Political Subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 3,488.9 3,083.6
Fair Value, Measurements, Recurring | Government Sponsored Agency    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 17,645.8 24,956.7
Fair Value, Measurements, Recurring | Non-U.S. Government    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 623.8 714.0
Fair Value, Measurements, Recurring | Corporate Debt    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 2,462.9 2,539.6
Fair Value, Measurements, Recurring | Covered Bonds    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 535.4 553.1
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 3,058.5 2,345.8
Fair Value, Measurements, Recurring | Other Asset-Backed    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 5,278.1 3,997.5
Fair Value, Measurements, Recurring | Commercial Mortgage-Backed    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 1,211.6 1,031.8
Fair Value, Measurements, Recurring | Other Assets    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
NETTING (886.8) (3,507.8)
Derivative Assets 1,929.5 1,050.4
Fair Value, Measurements, Recurring | Other Assets | Foreign Exchange Contracts    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
NETTING (884.1) (3,505.3)
Derivative Assets 1,724.8 755.4
Fair Value, Measurements, Recurring | Other Assets | Interest Rate Contracts    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
NETTING (2.7) (2.5)
Derivative Assets 204.7 295.0
Fair Value, Measurements, Recurring | Other Liabilities    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
NETTING (2,088.3) (2,817.1)
Derivative Liabilities 462.6 2,065.7
Fair Value, Measurements, Recurring | Other Liabilities | Foreign Exchange Contracts    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
NETTING (2,021.1) (2,718.6)
Derivative Liabilities 385.2 2,003.9
Fair Value, Measurements, Recurring | Other Liabilities | Interest Rate Contracts    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
NETTING (67.2) (98.5)
Derivative Liabilities 39.0 26.5
Fair Value, Measurements, Recurring | Other Liabilities | Other Financial Derivatives    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
NETTING 0.0 0.0
Derivative Liabilities 38.4 35.3
Fair Value, Measurements, Recurring | LEVEL 1    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 2,559.0 2,799.9
Trading Account 0.0 0.0
Total Available for Sale and Trading Debt Securities 2,559.0 2,799.9
Fair Value, Measurements, Recurring | LEVEL 1 | U.S. Government    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 2,559.0 2,799.9
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 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 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 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 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 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 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 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 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 34,305.0 39,222.1
Trading Account 0.5 0.5
Total Available for Sale and Trading Debt Securities 34,305.5 39,222.6
Fair Value, Measurements, Recurring | LEVEL 2 | U.S. Government    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 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 3,488.9 3,083.6
Fair Value, Measurements, Recurring | LEVEL 2 | Government Sponsored Agency    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 17,645.8 24,956.7
Fair Value, Measurements, Recurring | LEVEL 2 | Non-U.S. Government    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 623.8 714.0
Fair Value, Measurements, Recurring | LEVEL 2 | Corporate Debt    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 2,462.9 2,539.6
Fair Value, Measurements, Recurring | LEVEL 2 | Covered Bonds    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 535.4 553.1
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 3,058.5 2,345.8
Fair Value, Measurements, Recurring | LEVEL 2 | Other Asset-Backed    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 5,278.1 3,997.5
Fair Value, Measurements, Recurring | LEVEL 2 | Commercial Mortgage-Backed    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 1,211.6 1,031.8
Fair Value, Measurements, Recurring | LEVEL 2 | Other Assets    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Assets 2,816.3 4,558.2
Fair Value, Measurements, Recurring | LEVEL 2 | Other Assets | Foreign Exchange Contracts    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Assets 2,608.9 4,260.7
Fair Value, Measurements, Recurring | LEVEL 2 | Other Assets | Interest Rate Contracts    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Assets 207.4 297.5
Fair Value, Measurements, Recurring | LEVEL 2 | Other Liabilities    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Liabilities 2,512.5 4,847.5
Fair Value, Measurements, Recurring | LEVEL 2 | Other Liabilities | Foreign Exchange Contracts    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Liabilities 2,406.3 4,722.5
Fair Value, Measurements, Recurring | LEVEL 2 | Other Liabilities | Interest Rate Contracts    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Liabilities 106.2 125.0
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 | U.S. Government    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 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 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 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 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 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 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 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 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 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 38.4 35.3
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 $ 38.4 $ 35.3