Restructuring Costs - Narrative (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Restructuring and Related Activities [Abstract]
Restructuring costs, net	$ 5	$ 2
Restructuring Cost and Reserve [Line Items]
Restructuring costs, net	5	2
2020 Restructuring Plan
Restructuring and Related Activities [Abstract]
Restructuring costs, net	5
Restructuring Cost and Reserve [Line Items]
Restructuring costs, net	5
Restructuring cost incurred to date	24
2020 Restructuring Plan | Minimum
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs	30
2020 Restructuring Plan | Maximum
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs	$ 35
Accelerated Transformation Plan (ATP)
Restructuring and Related Activities [Abstract]
Restructuring costs, net		2
Restructuring Cost and Reserve [Line Items]
Restructuring costs, net		$ 2