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Fair Value Measurements (Recurring Basis Hierarchy Leveling) (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale $ 39,968.9 $ 38,876.3
Derivative Assets 3,329.6 3,387.7
NETTING (2,259.1) (2,338.0)
Derivative Assets 1,070.5 1,049.7
Derivative Liabilities 3,025.8 3,313.0
NETTING (2,370.7) (1,618.4)
Derivative Liabilities 655.1 1,694.6
Cross Product Collateral Adjustment    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
NETTING (571.9) (1,136.8)
NETTING (683.6) (417.2)
U.S. Government    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 4,176.4 4,549.1
Obligations of States and Political Subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 2,025.9 1,615.3
Government Sponsored Agency    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 23,405.4 23,271.2
Non-U.S. Government    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 744.7 3.3
Corporate Debt    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 2,590.8 2,402.7
Covered Bonds    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 612.0 769.9
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 2,257.7 2,127.6
Other Asset-Backed    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 3,182.6 3,330.5
Commercial Mortgage-Backed    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 965.4 797.7
Other    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 8.0 9.0
LEVEL 2    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 35,800.0 34,300.0
Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 39,968.9 38,876.3
Trading Account 1.0 0.3
Total Available for Sale and Trading Debt Securities 39,969.9 38,876.6
Fair Value, Measurements, Recurring | U.S. Government    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 4,176.4 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 2,025.9 1,615.3
Fair Value, Measurements, Recurring | Government Sponsored Agency    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 23,405.4 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 744.7 3.3
Fair Value, Measurements, Recurring | Corporate Debt    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 2,590.8 2,402.7
Fair Value, Measurements, Recurring | Covered Bonds    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 612.0 769.9
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 2,257.7 2,127.6
Fair Value, Measurements, Recurring | Other Asset-Backed    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 3,182.6 3,330.5
Fair Value, Measurements, Recurring | Commercial Mortgage-Backed    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 965.4 797.7
Fair Value, Measurements, Recurring | Other    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 8.0 9.0
Fair Value, Measurements, Recurring | Other Assets    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
NETTING (2,259.1) (2,338.0)
Derivative Assets 1,070.5 1,049.7
Fair Value, Measurements, Recurring | Other Assets | Foreign Exchange Contracts    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
NETTING 2,256.1 2,334.1
Derivative Assets 716.2 900.7
Fair Value, Measurements, Recurring | Other Assets | Interest Rate Contracts    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
NETTING 3.0 3.9
Derivative Assets 354.3 149.0
Fair Value, Measurements, Recurring | Other Liabilities    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
NETTING (2,370.7) (1,618.4)
Derivative Liabilities 655.1 1,694.6
Fair Value, Measurements, Recurring | Other Liabilities | Foreign Exchange Contracts    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
NETTING 2,237.7 1,548.6
Derivative Liabilities 602.2 1,633.6
Fair Value, Measurements, Recurring | Other Liabilities | Interest Rate Contracts    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
NETTING 133.0 57.3
Derivative Liabilities 21.6 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 31.3 20.9
Fair Value, Measurements, Recurring | LEVEL 1    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 4,176.4 4,549.1
Trading Account 0.0 0.0
Total Available for Sale and Trading Debt Securities 4,176.4 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 4,176.4 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 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    
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 35,792.5 34,327.2
Trading Account 1.0 0.3
Total Available for Sale and Trading Debt Securities 35,793.5 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 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 2,025.9 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 23,405.4 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 744.7 3.3
Fair Value, Measurements, Recurring | LEVEL 2 | Corporate Debt    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 2,590.8 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 612.0 769.9
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 2,257.7 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 3,182.6 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 965.4 797.7
Fair Value, Measurements, Recurring | LEVEL 2 | Other    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available-for-sale 8.0 9.0
Fair Value, Measurements, Recurring | LEVEL 2 | Other Assets    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Assets 3,329.6 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 2,972.3 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 357.3 152.9
Fair Value, Measurements, Recurring | LEVEL 2 | Other Liabilities    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Liabilities 2,994.5 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 2,839.9 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 154.6 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 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    
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 31.3 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 $ 31.3 $ 33.4