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Financial Derivatives (Hedged Items- Fair Value Hedges) (Details) - Designated as Hedging Instrument - Fair Value Hedging - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Investment Securities    
Derivative Instruments, Gain (Loss) [Line Items]    
Carrying Value of the Hedged Items $ 2,376 $ 2,655
Cumulative fair value hedge adjustment included in the carrying value of hedged items (121) 23
Borrowed Funds    
Derivative Instruments, Gain (Loss) [Line Items]    
Carrying Value of the Hedged Items 21,781 24,259
Cumulative fair value hedge adjustment included in the carrying value of hedged items (1,283) 663
Borrowed Funds Discontinued Relationships    
Derivative Instruments, Gain (Loss) [Line Items]    
Fair value hedge adjustments primarily related to discontinued borrowed funds hedge relationships, cumulative increase (decrease) $ (100) $ (100)