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Derivatives and Hedging Activities (Schedule of Impact of the Derivative Instruments on Income) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items]        
Amounts reclassified from OCI into earnings, cash flow hedges $ (4) $ 2 $ (11) $ 7
Interest Expense [Member] | Deposits [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Total amounts of income and expense line items presented in the statements of income in which the effects of fair value or cash flow hedges are recorded (287) (407) (1,000) (1,194)
Interest Expense [Member] | Deposits [Member] | Designated as Hedges [Member] | Interest Rate Swaps [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Amounts reclassified from OCI into earnings, cash flow hedges (4) 1 (9) 3
Gains (losses) on hedged items, fair value hedges 0 0 0 0
Gains (losses) on interest rate swaps, fair value hedges 0 0 0 0
Total gains (losses) on fair value hedges 0 0 0 0
Interest Expense [Member] | Long-term Borrowings [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Total amounts of income and expense line items presented in the statements of income in which the effects of fair value or cash flow hedges are recorded (126) (231) (479) (721)
Interest Expense [Member] | Long-term Borrowings [Member] | Designated as Hedges [Member] | Interest Rate Swaps [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Amounts reclassified from OCI into earnings, cash flow hedges 0 1 (2) 4
Gains (losses) on hedged items, fair value hedges 59 (20) (326) (160)
Gains (losses) on interest rate swaps, fair value hedges (9) 12 434 128
Total gains (losses) on fair value hedges 50 (8) 108 (32)
Other Income [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Total amounts of income and expense line items presented in the statements of income in which the effects of fair value or cash flow hedges are recorded 17 23 59 73
Other Income [Member] | Designated as Hedges [Member] | Interest Rate Swaps [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Amounts reclassified from OCI into earnings, cash flow hedges 0 0 0 0
Gains (losses) on hedged items, fair value hedges 0 0 0 0
Gains (losses) on interest rate swaps, fair value hedges 0 0 0 0
Total gains (losses) on fair value hedges $ 0 $ 0 $ 0 $ 0