Stockholders' Equity (Accumulated Other Comprehensive Income) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ (983)	$ (316)	$ (209)	$ (155)
Other comprehensive income (loss) before reclassifications			(6)	5
Amounts reclassified from accumulated other comprehensive income			9	21
Net current-period other comprehensive income (loss)	(36)	2	3	26
Ending balance	(649)	92	(649)	92
Foreign exchange contracts | Derivatives designated as hedging instruments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Derivatives used in net investment hedge, net of tax	128		128
Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			16	40
Other comprehensive income (loss) before reclassifications			(43)	(10)
Amounts reclassified from accumulated other comprehensive income			0	11
Net current-period other comprehensive income (loss)			(43)	1
Ending balance	(27)	41	(27)	41
Net Unrealized Gains (Losses) on Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			(19)	(51)
Other comprehensive income (loss) before reclassifications			36	14
Amounts reclassified from accumulated other comprehensive income			7	7
Net current-period other comprehensive income (loss)			43	21
Ending balance	24	(30)	24	(30)
Net Unrealized Gains (Losses) on Cash Flow Hedges | Corporate interest expense
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Amounts reclassified from accumulated other comprehensive income	3		7	6
Amounts reclassified from accumulated other comprehensive income (loss)	4		9	8
Net Unrealized Gains (Losses) on Cash Flow Hedges | Vehicle interest net
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Amounts reclassified from accumulated other comprehensive income		1	1	1
Amounts reclassified from accumulated other comprehensive income (loss)		1	2	2
Minimum Pension Liability Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			(130)	(176)
Other comprehensive income (loss) before reclassifications			1	1
Amounts reclassified from accumulated other comprehensive income			2	3
Net current-period other comprehensive income (loss)			3	4
Ending balance	(127)	(172)	(127)	(172)
Minimum Pension Liability Adjustment | Selling, general and administrative expenses
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Amounts reclassified from accumulated other comprehensive income		1	2	3
Amounts reclassified from accumulated other comprehensive income (loss)		2	3	5
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			(133)	(187)
Ending balance	$ (130)	$ (161)	$ (130)	$ (161)