Restructuring Costs - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Restructuring and Related Activities [Abstract]
Restructuring costs, net	$ 4	$ 3	$ 14	$ 22
Restructuring Cost and Reserve [Line Items]
Restructuring costs, net	4	$ 3	14	$ 22
2020 Restructuring Plan
Restructuring and Related Activities [Abstract]
Restructuring costs, net	4		12
Restructuring Cost and Reserve [Line Items]
Restructuring costs, net	4		12
2020 Restructuring Plan | Minimum
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs	20		20
2020 Restructuring Plan | Maximum
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs	$ 25		$ 25