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Derivatives and Hedging - Interest Rate Management Risk Narrative (Details) - Foreign exchange contracts - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Derivative [Line Items]        
Pretax gains that will be reclassified into earnings in the next twelve months     $ 8  
Not designated as hedging instrument        
Derivative [Line Items]        
Derivative gain (loss) $ (17) $ 11 $ (9) $ (27)