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Consolidating Condensed Statements of Operations (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 2,050 | $ 2,778 | $ 2,328 | $ 1,968 | $ 2,019 | $ 2,752 | $ 2,238 | $ 1,839 | $ 9,124 | $ 8,848 | $ 8,659 |
Operating |  |  |  |  |  |  |  |  | 4,639 | 4,472 | 4,382 |
Vehicle depreciation and lease charges, net |  |  |  |  |  |  |  |  | 2,179 | 2,221 | 2,047 |
Selling, general and administrative |  |  |  |  |  |  |  |  | 1,220 | 1,120 | 1,134 |
Vehicle interest, net |  |  |  |  |  |  |  |  | 314 | 286 | 284 |
Non-vehicle related depreciation and amortization |  |  |  |  |  |  |  |  | 256 | 259 | 253 |
Interest expense |  |  |  |  |  |  |  |  | 188 | 188 | 203 |
Intercompany interest expense (income) |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Early extinguishment of debt |  |  |  |  |  |  |  |  | 19 | 3 | 27 |
Restructuring Charges |  |  |  |  |  |  |  |  | 22 | 63 | 29 |
Transaction-related costs, net |  |  |  |  |  |  |  |  | 20 | 23 | 21 |
Impairment of Intangible Assets (Excluding Goodwill) |  |  |  |  |  |  |  |  |  | 2 |  |
Total expenses |  |  |  |  |  |  |  |  | 8,857 | 8,637 | 8,380 |
Income before income taxes |  |  |  |  |  |  |  |  | 267 | 211 | 279 |
Provision for (benefit from) income taxes |  |  |  |  |  |  |  |  | 102 | (150) | 116 |
Equity in earnings (loss) of subsidiaries |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Net income |  |  |  |  |  |  |  |  | 165 | 361 | 163 |
Total comprehensive income |  |  |  |  |  |  |  |  | 62 | 491 | 156 |
Payments for (Proceeds from) Other Investing Activities |  |  |  |  |  |  |  |  | (44) | 5 | 1 |
Net Cash Provided by (Used in) Investing Activities |  |  |  |  |  |  |  |  | (3,426) | (2,204) | (2,182) |
Effect of changes in exchange rates on cash and cash equivalents, program and restricted cash |  |  |  |  |  |  |  |  | (16) | 45 | (6) |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect |  |  |  |  |  |  |  |  | (166) | 181 | 3 |
Program cash | 115 |  |  |  | 283 |  |  |  | 115 | 283 |  |
Restricted Cash | 5 |  |  |  | 7 |  |  |  | 5 | 7 |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 735 |  |  |  | 901 |  |  |  | 735 | 901 | 720 | $ 717
Parent Company |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Operating |  |  |  |  |  |  |  |  | 4 | 3 | 4 |
Vehicle depreciation and lease charges, net |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Selling, general and administrative |  |  |  |  |  |  |  |  | 48 | 39 | 38 |
Vehicle interest, net |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Non-vehicle related depreciation and amortization |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Interest expense |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Intercompany interest expense (income) |  |  |  |  |  |  |  |  | (12) | (12) | (13) |
Early extinguishment of debt |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Restructuring Charges |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Transaction-related costs, net |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Impairment of Intangible Assets (Excluding Goodwill) |  |  |  |  |  |  |  |  |  | 0 |  |
Total expenses |  |  |  |  |  |  |  |  | 40 | 30 | 29 |
Income before income taxes |  |  |  |  |  |  |  |  | (40) | (30) | (29) |
Provision for (benefit from) income taxes |  |  |  |  |  |  |  |  | (10) | (5) | (11) |
Equity in earnings (loss) of subsidiaries |  |  |  |  |  |  |  |  | 195 | 386 | 181 |
Net income |  |  |  |  |  |  |  |  | 165 | 361 | 163 |
Total comprehensive income |  |  |  |  |  |  |  |  | 62 | 491 | 156 |
Payments for (Proceeds from) Other Investing Activities |  |  |  |  |  |  |  |  | 0 | 100 | 118 |
Net Cash Provided by (Used in) Investing Activities |  |  |  |  |  |  |  |  | 0 | 100 | 118 |
Effect of changes in exchange rates on cash and cash equivalents, program and restricted cash |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect |  |  |  |  |  |  |  |  | (3) | 1 | (1) |
Program cash | 0 |  |  |  | 0 |  |  |  | 0 | 0 |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 1 |  |  |  | 4 |  |  |  | 1 | 4 | 3 | 4
Subsidiary Issuers |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Operating |  |  |  |  |  |  |  |  | 7 | 20 | 18 |
Vehicle depreciation and lease charges, net |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Selling, general and administrative |  |  |  |  |  |  |  |  | 11 | 8 | 18 |
Vehicle interest, net |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Non-vehicle related depreciation and amortization |  |  |  |  |  |  |  |  | 1 | 1 | 2 |
Interest expense |  |  |  |  |  |  |  |  | 153 | 157 | 141 |
Intercompany interest expense (income) |  |  |  |  |  |  |  |  | (11) | 95 | (7) |
Early extinguishment of debt |  |  |  |  |  |  |  |  | 19 | 4 | 10 |
Restructuring Charges |  |  |  |  |  |  |  |  | 0 | 7 | 0 |
Transaction-related costs, net |  |  |  |  |  |  |  |  | 1 | 1 | 2 |
Impairment of Intangible Assets (Excluding Goodwill) |  |  |  |  |  |  |  |  |  | 0 |  |
Total expenses |  |  |  |  |  |  |  |  | 181 | 293 | 184 |
Income before income taxes |  |  |  |  |  |  |  |  | (181) | (293) | (184) |
Provision for (benefit from) income taxes |  |  |  |  |  |  |  |  | (48) | 267 | (70) |
Equity in earnings (loss) of subsidiaries |  |  |  |  |  |  |  |  | 328 | 946 | 295 |
Net income |  |  |  |  |  |  |  |  | 195 | 386 | 181 |
Total comprehensive income |  |  |  |  |  |  |  |  | 92 | 515 | 173 |
Payments for (Proceeds from) Other Investing Activities |  |  |  |  |  |  |  |  | (8) | 110 | (1) |
Net Cash Provided by (Used in) Investing Activities |  |  |  |  |  |  |  |  | (33) | 106 | (4) |
Effect of changes in exchange rates on cash and cash equivalents, program and restricted cash |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect |  |  |  |  |  |  |  |  | (2) | 2 | (58) |
Program cash | 0 |  |  |  | 0 |  |  |  | 0 | 0 |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 12 |  |  |  | 14 |  |  |  | 12 | 14 | 12 | 70
Guarantor Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 5,431 | 5,312 | 5,343 |
Operating |  |  |  |  |  |  |  |  | 2,668 | 2,598 | 2,622 |
Vehicle depreciation and lease charges, net |  |  |  |  |  |  |  |  | 2,162 | 2,226 | 1,993 |
Selling, general and administrative |  |  |  |  |  |  |  |  | 662 | 619 | 631 |
Vehicle interest, net |  |  |  |  |  |  |  |  | 229 | 199 | 198 |
Non-vehicle related depreciation and amortization |  |  |  |  |  |  |  |  | 145 | 160 | 155 |
Interest expense |  |  |  |  |  |  |  |  | 3 | 1 | 3 |
Intercompany interest expense (income) |  |  |  |  |  |  |  |  | 26 | 23 | 23 |
Early extinguishment of debt |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Restructuring Charges |  |  |  |  |  |  |  |  | 11 | 44 | 9 |
Transaction-related costs, net |  |  |  |  |  |  |  |  | 4 | 3 | 1 |
Impairment of Intangible Assets (Excluding Goodwill) |  |  |  |  |  |  |  |  |  | 2 |  |
Total expenses |  |  |  |  |  |  |  |  | 5,910 | 5,875 | 5,635 |
Income before income taxes |  |  |  |  |  |  |  |  | (479) | (563) | (292) |
Provision for (benefit from) income taxes |  |  |  |  |  |  |  |  | 93 | (527) | 123 |
Equity in earnings (loss) of subsidiaries |  |  |  |  |  |  |  |  | 900 | 982 | 710 |
Net income |  |  |  |  |  |  |  |  | 328 | 946 | 295 |
Total comprehensive income |  |  |  |  |  |  |  |  | 228 | 1,073 | 283 |
Payments for (Proceeds from) Other Investing Activities |  |  |  |  |  |  |  |  | 0 | 110 | 0 |
Net Cash Provided by (Used in) Investing Activities |  |  |  |  |  |  |  |  | (95) | 24 | (65) |
Effect of changes in exchange rates on cash and cash equivalents, program and restricted cash |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect |  |  |  |  |  |  |  |  | 1 | 0 | 0 |
Program cash | 0 |  |  |  | 0 |  |  |  | 0 | 0 |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 1 |  |  |  | 0 |  |  |  | 1 | 0 | 0 | 0
Non-Guarantor Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 6,006 | 5,931 | 5,510 |
Operating |  |  |  |  |  |  |  |  | 1,960 | 1,851 | 1,738 |
Vehicle depreciation and lease charges, net |  |  |  |  |  |  |  |  | 2,102 | 2,183 | 2,045 |
Selling, general and administrative |  |  |  |  |  |  |  |  | 499 | 454 | 447 |
Vehicle interest, net |  |  |  |  |  |  |  |  | 313 | 294 | 289 |
Non-vehicle related depreciation and amortization |  |  |  |  |  |  |  |  | 110 | 98 | 96 |
Interest expense |  |  |  |  |  |  |  |  | 32 | 30 | 59 |
Intercompany interest expense (income) |  |  |  |  |  |  |  |  | (3) | (106) | (3) |
Early extinguishment of debt |  |  |  |  |  |  |  |  | 0 | (1) | 17 |
Restructuring Charges |  |  |  |  |  |  |  |  | 11 | 12 | 20 |
Transaction-related costs, net |  |  |  |  |  |  |  |  | 15 | 19 | 18 |
Impairment of Intangible Assets (Excluding Goodwill) |  |  |  |  |  |  |  |  |  | 0 |  |
Total expenses |  |  |  |  |  |  |  |  | 5,039 | 4,834 | 4,726 |
Income before income taxes |  |  |  |  |  |  |  |  | 967 | 1,097 | 784 |
Provision for (benefit from) income taxes |  |  |  |  |  |  |  |  | 67 | 115 | 74 |
Equity in earnings (loss) of subsidiaries |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Net income |  |  |  |  |  |  |  |  | 900 | 982 | 710 |
Total comprehensive income |  |  |  |  |  |  |  |  | 806 | 1,103 | 712 |
Payments for (Proceeds from) Other Investing Activities |  |  |  |  |  |  |  |  | (36) | 5 | 2 |
Net Cash Provided by (Used in) Investing Activities |  |  |  |  |  |  |  |  | (3,702) | (2,378) | (2,401) |
Effect of changes in exchange rates on cash and cash equivalents, program and restricted cash |  |  |  |  |  |  |  |  | (16) | 45 | (6) |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect |  |  |  |  |  |  |  |  | (162) | 178 | 62 |
Program cash | 115 |  |  |  | 283 |  |  |  | 115 | 283 |  |
Restricted Cash | 5 |  |  |  | 7 |  |  |  | 5 | 7 |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 721 |  |  |  | 883 |  |  |  | 721 | 883 | 705 | 643
Eliminations |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | (2,313) | (2,395) | (2,194) |
Operating |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Vehicle depreciation and lease charges, net |  |  |  |  |  |  |  |  | (2,085) | (2,188) | (1,991) |
Selling, general and administrative |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Vehicle interest, net |  |  |  |  |  |  |  |  | (228) | (207) | (203) |
Non-vehicle related depreciation and amortization |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Interest expense |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Intercompany interest expense (income) |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Early extinguishment of debt |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Restructuring Charges |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Transaction-related costs, net |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Impairment of Intangible Assets (Excluding Goodwill) |  |  |  |  |  |  |  |  |  | 0 |  |
Total expenses |  |  |  |  |  |  |  |  | (2,313) | (2,395) | (2,194) |
Income before income taxes |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Provision for (benefit from) income taxes |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Equity in earnings (loss) of subsidiaries |  |  |  |  |  |  |  |  | (1,423) | (2,314) | (1,186) |
Net income |  |  |  |  |  |  |  |  | (1,423) | (2,314) | (1,186) |
Total comprehensive income |  |  |  |  |  |  |  |  | (1,126) | (2,691) | (1,168) |
Payments for (Proceeds from) Other Investing Activities |  |  |  |  |  |  |  |  | 0 | (320) | (118) |
Net Cash Provided by (Used in) Investing Activities |  |  |  |  |  |  |  |  | 404 | (56) | 170 |
Effect of changes in exchange rates on cash and cash equivalents, program and restricted cash |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Program cash | 0 |  |  |  | 0 |  |  |  | 0 | 0 |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | $ 0 |  |  |  | $ 0 |  |  |  | $ 0 | $ 0 | $ 0 | $ 0

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