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Derivative Financial Instruments - Carrying Value of Hedged Items in Fair Value Hedge (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Securities available-for-sale [Member]    
Derivatives, Fair Value [Line Items]    
Carrying amount of hedged items [1] $ 7,952 $ 7,966
Active hedged asset adjustments 53 681
Discontinued hedged asset adjustments 703 738
Total hedged asset adjustments 756 1,419
Deposits [Member]    
Derivatives, Fair Value [Line Items]    
Carrying amount of hedged liability items 3,640 [1] 5,214
Active hedged liability adjustments 140 214
Discontinued hedged liability adjustments 0 0
Total hedged liability adjustments 140 214
Long-term Debt [Member]    
Derivatives, Fair Value [Line Items]    
Carrying amount of hedged liability items [1] 3,636 2,227
Active hedged liability adjustments (40) 242
Discontinued hedged liability adjustments 176 (15)
Total hedged liability adjustments $ 136 $ 227
[1] The carrying amount of securities AFS represents the amortized cost basis.