Revenue Recognition - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
Net sales	$ 1,048	$ 971
Customer advances	341		$ 130
Contract with Customer, Liability, Revenue Recognized	$ 85	$ 75