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Reconciliation of Adjusted EBITDA to Income (Loss) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |
Adjusted EBITDA | $ 735 | $ 838 | $ 903
Non-vehicle depreciation and amortization | 259 | 253 | 218
Interest expense related to corporate debt, net | (188) | (203) | (194)
Early extinguishment of debt | 3 | 27 | 23
Restructuring Charges | 63 | 29 | 18
Impairment | 23 | 21 | 68
Asset Impairment Charges | 2 | 0 | 0
Charges for legal matter | (14) | 26 | 0
Income before income taxes | 211 | 279 | 382
Acquisition-related Costs [Member] |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |
Non-vehicle depreciation and amortization | $ 58 | $ 59 | $ 55

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2420-110228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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