Deferred Income Tax Assets And Liabilities (Detail) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Deferred Income Tax Assets And Liabilities [Line Items]
Net tax loss carryforwards	$ 1,390	$ 1,104
Accrued liabilities and deferred income	230	216
Tax credits	17	24
Depreciation and amortization	16	4
Acquisition and integration-related liabilities	0	0
Provision for doubtful accounts	6	8
Deferred Tax Assets, Hedging Transactions	0	0
Other	38	50
Valuation allowance	(311)	(331)
Deferred income tax assets	1,386	1,075
Depreciation and amortization	60	121
Deferred Tax Liabilities, Prepaid Expenses	20	20
Other	5	3
Non-current deferred income tax liabilities	85	144
Non-current net deferred income tax assets	1,301	931
Deferred Income Tax Assets and Liabilities Additional Information (Detail) [Abstract]
Deferred Tax Assets, Valuation Allowance	311	331
Deferred Tax Assets Operating Loss Carryforward With Valuation Against It	283	302
Deferred Tax Assets State And Local	28	29
Vehicle Programs
Deferred Income Tax Assets And Liabilities [Line Items]
Depreciation and amortization	44	58
Depreciation and amortization	2,005	1,652
Deferred Tax Liabilities, Net	$ 1,961	$ 1,594