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Deferred Income Tax Assets And Liabilities (Detail) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred Income Tax Assets And Liabilities [Line Items] |  |
Net tax loss carryforwards | $ 1,146 | $ 1,645
Operating Lease, Liability, Noncurrent | 657 | 678
Accrued liabilities and deferred income | 237 | 236
Tax credits | 17 | 20
Depreciation and amortization | 3 | 17
Provision for doubtful accounts | 8 | 8
Other | 110 | 75
Deferred Tax Assets, Valuation Allowance | 204 | 214
Deferred Tax Assets, Net of Valuation Allowance | 1,974 | 2,465
Operating Lease, Right-of-Use Asset | 649 | 672
Depreciation and amortization | 105 | 108
Deferred Tax Liabilities, Prepaid Expenses | 8 | 17
Other | 14 | 6
Deferred Tax Liabilities, Net | 776 | 803
Deferred Tax Assets, Net | 1,198 | 1,662
Deferred Income Tax Assets and Liabilities Additional Information (Detail) [Abstract] |  |
Deferred Tax Assets, Valuation Allowance | 204 | 214
Deferred Tax Assets Operating Loss Carryforward With Valuation Against It | 195 | 192
Deferred Tax Assets State And Local | 9 | 22
Vehicle Programs |  |
Deferred Income Tax Assets And Liabilities [Line Items] |  |
Depreciation and amortization | 62 | 54
Depreciation and amortization | 1,445 | 2,243
Other Assets [Member] |  |
Deferred Income Tax Assets And Liabilities [Line Items] |  |
Other | 27 | 48
Other Liabilities [Member] |  |
Deferred Income Tax Assets And Liabilities [Line Items] |  |
Other | 27 | 48
Liability [Member] |  |
Deferred Income Tax Assets And Liabilities [Line Items] |  |
Deferred Tax Liabilities, Net | 1,472 | 2,291
Vehicle programs, net [Member] |  |
Deferred Income Tax Assets And Liabilities [Line Items] |  |
Deferred Tax Liabilities, Net | 1,383 | 2,189
Deferred Tax Asset [Domain] |  |
Deferred Income Tax Assets And Liabilities [Line Items] |  |
Deferred Tax Assets, Net | $ 89 | $ 102

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