Segment Information - Consolidated Revenue Information by Geographic Area (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Revenue	$ 1,356	$ 1,240	$ 4,081	$ 3,596
United States
Segment Reporting Information [Line Items]
Revenue	729	660	2,280	1,910
Non-U.S.
Segment Reporting Information [Line Items]
Revenue	627	580	1,801	1,686
EMEA
Segment Reporting Information [Line Items]
Revenue	401	362	1,137	1,057
Asia-Pacific
Segment Reporting Information [Line Items]
Revenue	156	142	436	415
Americas
Segment Reporting Information [Line Items]
Revenue	$ 70	$ 76	$ 228	$ 214