Deferred Income Tax Assets And Liabilities (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Deferred Income Tax Assets And Liabilities [Line Items]
Net tax loss carryforwards	$ 1,104	$ 1,587
Accrued liabilities and deferred income	216	281
Tax credits	24	62
Depreciation and amortization	4	2
Acquisition and integration-related liabilities	2	5
Provision for doubtful accounts	8	7
Other	48	52
Valuation allowance	(331)	(357)
Deferred income tax assets	1,075	1,639
Depreciation and amortization	121	112
Deferred Tax Liabilities, Prepaid Expenses	20	32
Other	3	2
Non-current deferred income tax liabilities	144	146
Non-current net deferred income tax assets	931	1,493
Deferred Income Tax Assets and Liabilities Additional Information (Detail) [Abstract]
Deferred Tax Assets, Valuation Allowance	331	357
Deferred Tax Assets Operating Loss Carryforward With Valuation Against It	302	289
Deferred Tax Assets, Tax Credit Carryforwards, Foreign		39
Deferred Tax Assets State And Local	29	29
Vehicle Programs
Deferred Income Tax Assets And Liabilities [Line Items]
Depreciation and amortization	58	52
Depreciation and amortization	1,652	2,481
Deferred Tax Liabilities, Net	$ 1,594	$ 2,429