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Financial Derivatives (Impact of Fair Value Hedge Accounting on the Carrying Value of Hedged Items) (Details) - Fair Value Hedging [Member] - Designated as Hedging Instruments under GAAP [Member] - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Investment Securities [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Carrying Value of the Hedged Items $ 5,020 $ 5,666
Cumulative Fair Value Hedge Adjustment included in the Carrying Value of Hedged Items 222 59
Borrowed Funds [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Carrying Value of the Hedged Items 31,463 28,616
Cumulative Fair Value Hedge Adjustment included in the Carrying Value of Hedged Items 1,909 548
Borrowed Funds Discontinued Relationships [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Cumulative Fair Value Hedge Adjustment included in Carrying Value of Hedged Items $ (200) $ (300)