Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	$ 2	$ 4	$ 5
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax	8	6	5
Currency Translation Adjustment, Beginning Balance	(39)	(80)	51
Currency translation adjustments, net of tax of $33, $(9) and $(22), respectively	110	41	(131)
Currency Translation Adjustment, Ending Balance	71	(39)	(80)
Net Unrealized Gains (Losses) on Cash Flow Hedges, Beginning Balance	2	(2)	(1)
Net unrealized holding gains (losses), net of tax of $0, $(1), and $4, respectively	1	0	(6)
Net Unrealized Gains (Losses) on Cash Flow Hedges, Period change	3	4	(1)
Net Unrealized Gains (Losses) on Cash Flow Hedges, Ending Balance	5	2	(2)
Net Unrealized Gains (Losses) on Available- For-Sale Securities, Beginning Balance	1	0	2
Net unrealized gains (losses) on available-for-sale securities, net of tax of $(1), $(1),and $1, respectively	1	1	(2)
Less: Realized losses on available-for-sale securities reclassified to earnings, net of tax of $0, $0 and $1, respectively	0	0	0
Net unrealized gains on available-for-sale securities, net of tax of $0, $0 and $0, respectively	1	1	(2)
Net Unrealized Gains (Losses) on Available- For-Sale Securities, Ending Balance	2	1	0
Minimum Pension Liability Adjustment, Beginning Balance	(118)	(65)	(74)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax	11	(57)	6
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax	5	4	3
Minimum Pension Liability Adjustment, Period change	16	(53)	9
Minimum Pension Liability Adjustment, Ending Balance	(102)	(118)	(65)
Accumulated Other Comprehensive Income (Loss), Beginning Balance	(154)	(147)	(22)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent before reclassifications	123	(15)	(133)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	7	8	8
Accumulated Other Comprehensive Income (Loss), Period change	130	(7)	(125)
Accumulated Other Comprehensive Income (Loss), Ending Balance	(24)	(154)	(147)
Corporate Interest Expense [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	2	4	4
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	4	6	7
Vehicle Interest [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax		0	1
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax		$ 1	$ 1
Foreign Exchange Forward [Member] | Designated as Hedging Instrument
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Derivatives used in Net Investment Hedge, Net of Tax	$ 33