Stockholders' Equity (Accumulated Other Comprehensive Income) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ (209)	$ (155)
Other comprehensive income (loss) before reclassifications	33	19
Amounts reclassified from accumulated other comprehensive income (loss)	6	5
Net current-period other comprehensive income (loss)	39	24
Ending balance	(983)	(316)
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	90
Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	16	40
Other comprehensive income (loss) before reclassifications	7	(14)
Amounts reclassified from accumulated other comprehensive income (loss)	0	0
Net current-period other comprehensive income (loss)	7	(14)
Ending balance	23	26
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	26	32
Amounts reclassified from accumulated other comprehensive income (loss)	4	3
Net current-period other comprehensive income (loss)	30	35
Ending balance	11	(16)
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 (loss)	4	0
Amounts reclassified from accumulated other comprehensive income (loss)	5	1
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 (loss)		3
Amounts reclassified from accumulated other comprehensive income (loss)		4
Minimum Pension Liability Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(130)	(176)
Other comprehensive income (loss) before reclassifications	0	1
Amounts reclassified from accumulated other comprehensive income (loss)	2	2
Net current-period other comprehensive income (loss)	2	3
Ending balance	(128)	(173)
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 (loss)	(2)	(2)
Amounts reclassified from accumulated other comprehensive income (loss)	(3)	(3)
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(133)	(187)
Ending balance	$ (94)	$ (163)