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Derivative Financial Instruments - Carrying Value of Hedged Items in Fair Value Hedge (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Securities available-for-sale ("AFS")    
Derivatives, Fair Value [Line Items]    
Carrying amount of hedged items $ 14,637 $ 7,919
Active hedged asset adjustments (697) (72)
Discontinued hedged asset adjustments 867 1,010
Total hedged asset adjustments 170 938
Deposits    
Derivatives, Fair Value [Line Items]    
Carrying amount of hedged liability items 1,523 1,598
Active hedged liability adjustments (95) (27)
Discontinued hedged liability adjustments 118 125
Total hedged liability adjustments 23 98
Long-term debt    
Derivatives, Fair Value [Line Items]    
Carrying amount of hedged liability items 5,317 5,587
Active hedged liability adjustments (322) (61)
Discontinued hedged liability adjustments 139 148
Total hedged liability adjustments $ (183) $ 87