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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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Derivative [Line Items]        
Estimated pretax losses currently included within Accumulated Other Comprehensive Loss that will be reclassified to earnings in next twelve months     $ 11  
Not designated as hedging instrument        
Derivative [Line Items]        
Derivative gain (loss) $ 11 $ (16) $ (27) $ (20)