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Financial Derivatives (Gains (Losses) Recognized on Fair Value and Cash Flow Hedges in the Consolidated Income Statement) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items]        
Loans $ 2,257 $ 2,672 $ 4,737 $ 5,274
Investment Securities 527 629 1,109 1,249
Borrowed Funds 187 484 501 965
Other 271 367 614 675
Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] | Investment Securities [Member] | Interest Income [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Hedged items 3 116 237 174
Derivatives (2) (113) (233) (168)
Amounts related to interest settlements on derivatives (2) 5 (4) 10
Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] | Borrowed Funds [Member] | Interest Expense [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Hedged items (80) (523) (1,441) (797)
Derivatives 47 485 1,386 713
Amounts related to interest settlements on derivatives 133 9 192 20
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Loans [Member] | Interest Income [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of derivative gains (losses) reclassified from AOCI 102 (12) 144 (20)
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Investment Securities [Member] | Interest Income [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of derivative gains (losses) reclassified from AOCI $ 1 1 3 2
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Other [Member] | Noninterest Income [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of derivative gains (losses) reclassified from AOCI   $ 3 $ 1 $ 18