Business Segments - Segment Profits (Detail) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment profits	$ 545			$ 252			$ 1,115	$ 212
Interest expense, net of interest income	(99)			(107)			(301)	(313)
(Provision) benefit for income taxes	(58)			(27)			(1)	49
Net income (loss)	220	$ 422	$ (11)	100	$ (234)	$ 31	631	(103)
Unallocated corporate and other
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment profits	(194)			157			(181)	152
U.S. & Canada | Total segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment profits	485			66			972	188
International | Total segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment profits	$ 86			$ 11			$ 142	$ (179)