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Derivatives and Hedging - Interest Rate Management Risk Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
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 | Gross foreign exchange contracts        
Derivative [Line Items]        
Derivative gain (loss) $ (9) $ (20) $ (4) $ (11)