Derivative Instruments - Narrative (Details) - Derivatives not designated as hedges - Foreign currency option and forward contracts - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Derivative [Line Items]
Pre-tax gain (loss) recognized in earnings	$ (2)	$ (8)	$ 2	$ (10)
Maximum
Derivative [Line Items]
Derivative, term of contract			12 months