Deferred Income Tax Assets And Liabilities (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Deferred Income Tax Assets And Liabilities [Line Items]
Net tax loss carryforwards	$ 1,645	$ 1,390
Operating Lease, Liability, Noncurrent	678	0
Accrued liabilities and deferred income	236	230
Tax credits	20	17
Depreciation and amortization	17	16
Provision for doubtful accounts	8	6
Other	75	38
Valuation allowance	(214)	(311)
Deferred income tax assets	2,465	1,386
Operating Lease, Right-of-Use Asset	672	0
Depreciation and amortization	108	60
Deferred Tax Liabilities, Prepaid Expenses	17	20
Other	6	5
Non-current deferred income tax liabilities	803	85
Non-current net deferred income tax assets	1,662	1,301
Deferred Income Tax Assets and Liabilities Additional Information (Detail) [Abstract]
Deferred Tax Assets, Valuation Allowance	214	311
Deferred Tax Assets Operating Loss Carryforward With Valuation Against It	192	283
Deferred Tax Assets State And Local	22	28
Vehicle Programs
Deferred Income Tax Assets And Liabilities [Line Items]
Depreciation and amortization	54	44
Depreciation and amortization	2,243	2,005
Other Liabilities [Member]
Deferred Income Tax Assets And Liabilities [Line Items]
Other	48	0
Liability [Member]
Deferred Income Tax Assets And Liabilities [Line Items]
Non-current deferred income tax liabilities	2,291	2,005
Other Assets [Member]
Deferred Income Tax Assets And Liabilities [Line Items]
Other	48	0
Deferred Tax Asset [Domain]
Deferred Income Tax Assets And Liabilities [Line Items]
Deferred income tax assets	102	44
Vehicle programs, net [Member]
Deferred Income Tax Assets And Liabilities [Line Items]
Deferred Tax Liabilities, Net	$ 2,189	$ 1,961