Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax	$ 1	$ 2	$ 5
Beginning Balance	(2,300)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	71	(292)	542
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax	(130)	129	(295)
Reclassifications of Temporary to Permanent Equity	0
Net change	(51)	(147)	316
Ending Balance	(2,350)	(2,300)
Unrealized Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(1,734)	(1,567)	(1,798)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax	71	(292)	542
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax	36	148	(311)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0
Reclassifications of Temporary to Permanent Equity		23
Net change		(144)	231
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	107
Ending Balance	(1,627)	(1,734)	(1,567)
Pension and Other Post retirement Benefit Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(568)	(493)	(571)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(167)	(12)	20
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	11	21	58
Reclassifications of Temporary to Permanent Equity		84
Net change	(156)	9	78
Ending Balance	(724)	(568)	(493)
Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassifications of Temporary to Permanent Equity		0
Accumulated Other Comprehensive (Loss)/Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassifications of Temporary to Permanent Equity		107
Net change	(50)	(136)	299
Unrealized Gain (Loss) on Derivatives
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	2	3	13
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	1	(7)	(4)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(2)	6	(6)
Net change	(1)	(1)	(10)
Ending Balance	1	2	3
Parent
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(2,300)	(2,057)	(2,356)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	9	27	52
Reclassifications of Temporary to Permanent Equity	0
Net change	(50)	(136)	299
Ending Balance	$ (2,350)	$ (2,300)	$ (2,057)