Derivative Instruments - Narrative (Details) - Derivatives not designated as hedges - Foreign currency option and forward 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]
Pre-tax gain (loss) recognized in earnings	$ (1)	$ 5	$ 1	$ (5)
Maximum
Derivative [Line Items]
Derivative, term of contract (in months)			12 months