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Derivatives - Cumulative Basis Adjustment for Fair Value Hedges (Details) - Fair value hedges - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Derivatives    
Hedged Liability, Fair Value Hedge $ 582 $ 598
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease) 9 11
Short-term borrowings and current portion of long-term debt    
Derivatives    
Hedged Liability, Fair Value Hedge 357 373
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease) 4 5
Long-term debt    
Derivatives    
Hedged Liability, Fair Value Hedge 225 225
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease) $ 5 $ 6