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Reconciliation of Adjusted EBITDA to Income (Loss) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |
Non-vehicle depreciation and amortization | $ 286 | $ 263 | $ 256
COVID-19 Charges | 122 |  |
Charges for legal matter | 8 |  |
Non-operational charges related to shareholder activist activity | 4 | 2 | 9
Equity Method Investment, Realized Gain (Loss) on Disposal |  | (44) |
Acquisition-related Costs [Member] |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |
Non-vehicle depreciation and amortization | $ 66 | $ 56 | $ 61

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- Definition COVID-19 Charges, removed from EBITDA + References No definition available. + Details
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- Definition Charges for legal matter + References No definition available. + Details
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- Definition The expense recognized in the current period that allocates the cost of non-revenue generating tangible assets over their useful lives. + References No definition available. + Details
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- Definition Non-operational charges related to shareholder activist activity include third party advisory, legal and other professional service fees and are recorded within selling, general and administrative expenses. + References No definition available. + Details
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- Definition Amount of gain (loss) on sale or disposal of an equity method investment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(b)(7)(c)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(b)(9)(a)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 + Details
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