Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Currency Translation Adjustment, Beginning Balance	$ 9	$ (3)	$ 71
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	31	12	(81)
Currency Translation Adjustment, Ending Balance	40	9	(3)	$ 71
Net Unrealized Gains (Losses) on Cash Flow Hedges, Beginning Balance	(20)	2	5
Net unrealized holding gains (losses), net of tax of $14, $7, and $0, respectively	(39)	(20)	(2)
Net Unrealized Gains (Losses) on Cash Flow Hedges, Period change		(23)	(4)
Net Unrealized Gains (Losses) on Cash Flow Hedges, Ending Balance	(51)	(20)	2	5
Minimum Pension Liability Adjustment, Beginning Balance	(146)	(132)	(102)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax	(36)	(20)	(23)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax	6	6	5
Minimum Pension Liability Adjustment, Period change	(30)	(14)	(18)
Minimum Pension Liability Adjustment, Ending Balance	(176)	(146)	(132)	(102)
Accumulated Other Comprehensive Income (Loss), Beginning Balance	(157)	(133)	(24)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent before reclassifications	(42)	(28)	(106)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	12	3	3
Accumulated Other Comprehensive Income (Loss), Period change	(30)	(25)	(103)
Accumulated Other Comprehensive Income (Loss), Ending Balance	(187)	(157)	(133)	(24)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	8	(3)	(2)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax	9	8	7
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax	(2)	0	0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent	33	12	(81)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent				2
Cumulative Effect, Period of Adoption, Adjustment
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Currency Translation Adjustment, Beginning Balance		0	7
Currency Translation Adjustment, Ending Balance			0	7
Net Unrealized Gains (Losses) on Cash Flow Hedges, Beginning Balance		1	1
Net Unrealized Gains (Losses) on Cash Flow Hedges, Ending Balance			1	1
Minimum Pension Liability Adjustment, Beginning Balance		0	12
Minimum Pension Liability Adjustment, Ending Balance			0	12
Accumulated Other Comprehensive Income (Loss), Beginning Balance		1	(6)
Accumulated Other Comprehensive Income (Loss), Ending Balance			1	(6)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent				(2)
Cumulative Effect, Period of Adoption, Adjusted Balance
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Currency Translation Adjustment, Beginning Balance		(3)	78
Currency Translation Adjustment, Ending Balance			(3)	78
Net Unrealized Gains (Losses) on Cash Flow Hedges, Beginning Balance		3	6
Net Unrealized Gains (Losses) on Cash Flow Hedges, Ending Balance			3	6
Minimum Pension Liability Adjustment, Beginning Balance		(132)	(114)
Minimum Pension Liability Adjustment, Ending Balance			(132)	(114)
Accumulated Other Comprehensive Income (Loss), Beginning Balance		(132)	(30)
Accumulated Other Comprehensive Income (Loss), Ending Balance			(132)	$ (30)
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	6	3	2
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	9	4	3
Foreign Exchange Forward [Member] | Designated as Hedging Instrument
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	(67)	$ 17	$ 24
Derivatives used in Net Investment Hedge, Net of Tax	$ 14