Exit and Restructuring Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]
Exit and restructuring costs	$ 11	$ 10	$ 11
Estimated remaining costs	5
2019 Productivity Plan
Restructuring Cost and Reserve [Line Items]
Exit and restructuring costs	$ 11	8
2017 Productivity Plan
Restructuring Cost and Reserve [Line Items]
Exit and restructuring costs		$ 2	$ 11