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Derivatives and Hedging - Interest Rate Management Risk Narrative (Details) - Foreign exchange contracts - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Derivative [Line Items]    
Estimated pretax losses currently included within Accumulated Other Comprehensive Loss that will be reclassified to earnings in next twelve months $ 14  
Not Designated as Hedging Instrument    
Derivative [Line Items]    
Derivative gain (loss) $ (35) $ 5