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Consolidating Condensed Statements of Operations (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 2,162 | $ 2,753 | $ 2,337 | $ 1,920 | $ 2,050 | $ 2,778 | $ 2,328 | $ 1,968 | $ 9,172 | $ 9,124 | $ 8,848
Operating |  |  |  |  |  |  |  |  | 4,698 | 4,639 | 4,472
Vehicle depreciation and lease charges, net |  |  |  |  |  |  |  |  | 2,063 | 2,179 | 2,221
Selling, general and administrative |  |  |  |  |  |  |  |  | 1,237 | 1,220 | 1,120
Vehicle interest, net |  |  |  |  |  |  |  |  | 344 | 314 | 286
Non-vehicle related depreciation and amortization |  |  |  |  |  |  |  |  | 263 | 256 | 259
Interest expense |  |  |  |  |  |  |  |  | 178 | 188 | 188
Intercompany interest expense (income) |  |  |  |  |  |  |  |  | 0 | 0 | 0
Early extinguishment of debt |  |  |  |  |  |  |  |  | 12 | 19 | 3
Restructuring Charges |  |  |  |  |  |  |  |  | 80 | 22 | 63
Transaction-related costs, net |  |  |  |  |  |  |  |  | 10 | 20 | 23
Impairment of Intangible Assets (Excluding Goodwill) |  |  |  |  |  |  |  |  |  |  | 2
Total expenses |  |  |  |  |  |  |  |  | 8,885 | 8,857 | 8,637
Income before income taxes |  |  |  |  |  |  |  |  | 287 | 267 | 211
Provision for (benefit from) income taxes |  |  |  |  |  |  |  |  | (15) | 102 | (150)
Equity in earnings (loss) of subsidiaries |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income | $ 142 | $ 189 | $ 62 | $ (91) | $ 13 | $ 213 | $ 26 | $ (87) | 302 | 165 | 361
Total comprehensive income |  |  |  |  |  |  |  |  | 277 | 62 | 491
Payments for (Proceeds from) Other Investing Activities |  |  |  |  |  |  |  |  | 81 | (44) | 5
Net Cash Provided by (Used in) Investing Activities |  |  |  |  |  |  |  |  | (2,752) | (3,426) | (2,204)
Parent Company |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
Operating |  |  |  |  |  |  |  |  | 2 | 4 | 3
Vehicle depreciation and lease charges, net |  |  |  |  |  |  |  |  | 0 | 0 | 0
Selling, general and administrative |  |  |  |  |  |  |  |  | 50 | 48 | 39
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) | (12)
Early extinguishment of debt |  |  |  |  |  |  |  |  | 0 | 0 | 0
Restructuring Charges |  |  |  |  |  |  |  |  | 18 | 0 | 0
Transaction-related costs, net |  |  |  |  |  |  |  |  | 0 | 0 | 0
Impairment of Intangible Assets (Excluding Goodwill) |  |  |  |  |  |  |  |  |  |  | 0
Total expenses |  |  |  |  |  |  |  |  | 58 | 40 | 30
Income before income taxes |  |  |  |  |  |  |  |  | (58) | (40) | (30)
Provision for (benefit from) income taxes |  |  |  |  |  |  |  |  | (12) | (10) | (5)
Equity in earnings (loss) of subsidiaries |  |  |  |  |  |  |  |  | 348 | 195 | 386
Net income |  |  |  |  |  |  |  |  | 302 | 165 | 361
Total comprehensive income |  |  |  |  |  |  |  |  | 277 | 62 | 491
Payments for (Proceeds from) Other Investing Activities |  |  |  |  |  |  |  |  | 0 | 0 | 100
Net Cash Provided by (Used in) Investing Activities |  |  |  |  |  |  |  |  | 0 | 0 | 100
Subsidiary Issuers |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
Operating |  |  |  |  |  |  |  |  | 0 | 7 | 20
Vehicle depreciation and lease charges, net |  |  |  |  |  |  |  |  | 0 | 0 | 0
Selling, general and administrative |  |  |  |  |  |  |  |  | 17 | 11 | 8
Vehicle interest, net |  |  |  |  |  |  |  |  | 3 | 0 | 0
Non-vehicle related depreciation and amortization |  |  |  |  |  |  |  |  | 10 | 1 | 1
Interest expense |  |  |  |  |  |  |  |  | 131 | 153 | 157
Intercompany interest expense (income) |  |  |  |  |  |  |  |  | 10 | (11) | 95
Early extinguishment of debt |  |  |  |  |  |  |  |  | 12 | 19 | 4
Restructuring Charges |  |  |  |  |  |  |  |  | 0 | 0 | 7
Transaction-related costs, net |  |  |  |  |  |  |  |  | 4 | 1 | 1
Impairment of Intangible Assets (Excluding Goodwill) |  |  |  |  |  |  |  |  |  |  | 0
Total expenses |  |  |  |  |  |  |  |  | 187 | 181 | 293
Income before income taxes |  |  |  |  |  |  |  |  | (187) | (181) | (293)
Provision for (benefit from) income taxes |  |  |  |  |  |  |  |  | (220) | (48) | 267
Equity in earnings (loss) of subsidiaries |  |  |  |  |  |  |  |  | 315 | 328 | 946
Net income |  |  |  |  |  |  |  |  | 348 | 195 | 386
Total comprehensive income |  |  |  |  |  |  |  |  | 323 | 92 | 515
Payments for (Proceeds from) Other Investing Activities |  |  |  |  |  |  |  |  | (75) | (8) | 110
Net Cash Provided by (Used in) Investing Activities |  |  |  |  |  |  |  |  | (224) | (33) | 106
Guarantor Subsidiaries |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 5,613 | 5,431 | 5,312
Operating |  |  |  |  |  |  |  |  | 2,788 | 2,668 | 2,598
Vehicle depreciation and lease charges, net |  |  |  |  |  |  |  |  | 2,188 | 2,162 | 2,226
Selling, general and administrative |  |  |  |  |  |  |  |  | 700 | 662 | 619
Vehicle interest, net |  |  |  |  |  |  |  |  | 269 | 229 | 199
Non-vehicle related depreciation and amortization |  |  |  |  |  |  |  |  | 153 | 145 | 160
Interest expense |  |  |  |  |  |  |  |  | 2 | 3 | 1
Intercompany interest expense (income) |  |  |  |  |  |  |  |  | 59 | 26 | 23
Early extinguishment of debt |  |  |  |  |  |  |  |  | 0 | 0 | 0
Restructuring Charges |  |  |  |  |  |  |  |  | 38 | 11 | 44
Transaction-related costs, net |  |  |  |  |  |  |  |  | (6) | 4 | 3
Impairment of Intangible Assets (Excluding Goodwill) |  |  |  |  |  |  |  |  |  |  | 2
Total expenses |  |  |  |  |  |  |  |  | 6,191 | 5,910 | 5,875
Income before income taxes |  |  |  |  |  |  |  |  | (578) | (479) | (563)
Provision for (benefit from) income taxes |  |  |  |  |  |  |  |  | (24) | 93 | (527)
Equity in earnings (loss) of subsidiaries |  |  |  |  |  |  |  |  | 869 | 900 | 982
Net income |  |  |  |  |  |  |  |  | 315 | 328 | 946
Total comprehensive income |  |  |  |  |  |  |  |  | 312 | 228 | 1,073
Payments for (Proceeds from) Other Investing Activities |  |  |  |  |  |  |  |  | 12 | 0 | 110
Net Cash Provided by (Used in) Investing Activities |  |  |  |  |  |  |  |  | (134) | (95) | 24
Non-Guarantor Subsidiaries |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 5,923 | 6,006 | 5,931
Operating |  |  |  |  |  |  |  |  | 1,908 | 1,960 | 1,851
Vehicle depreciation and lease charges, net |  |  |  |  |  |  |  |  | 1,969 | 2,102 | 2,183
Selling, general and administrative |  |  |  |  |  |  |  |  | 470 | 499 | 454
Vehicle interest, net |  |  |  |  |  |  |  |  | 342 | 313 | 294
Non-vehicle related depreciation and amortization |  |  |  |  |  |  |  |  | 100 | 110 | 98
Interest expense |  |  |  |  |  |  |  |  | 45 | 32 | 30
Intercompany interest expense (income) |  |  |  |  |  |  |  |  | (57) | (3) | (106)
Early extinguishment of debt |  |  |  |  |  |  |  |  | 0 | 0 | (1)
Restructuring Charges |  |  |  |  |  |  |  |  | 24 | 11 | 12
Transaction-related costs, net |  |  |  |  |  |  |  |  | 12 | 15 | 19
Impairment of Intangible Assets (Excluding Goodwill) |  |  |  |  |  |  |  |  |  |  | 0
Total expenses |  |  |  |  |  |  |  |  | 4,813 | 5,039 | 4,834
Income before income taxes |  |  |  |  |  |  |  |  | 1,110 | 967 | 1,097
Provision for (benefit from) income taxes |  |  |  |  |  |  |  |  | 241 | 67 | 115
Equity in earnings (loss) of subsidiaries |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income |  |  |  |  |  |  |  |  | 869 | 900 | 982
Total comprehensive income |  |  |  |  |  |  |  |  | 860 | 806 | 1,103
Payments for (Proceeds from) Other Investing Activities |  |  |  |  |  |  |  |  | 69 | (36) | 5
Net Cash Provided by (Used in) Investing Activities |  |  |  |  |  |  |  |  | (2,469) | (3,702) | (2,378)
Eliminations |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | (2,364) | (2,313) | (2,395)
Operating |  |  |  |  |  |  |  |  | 0 | 0 | 0
Vehicle depreciation and lease charges, net |  |  |  |  |  |  |  |  | (2,094) | (2,085) | (2,188)
Selling, general and administrative |  |  |  |  |  |  |  |  | 0 | 0 | 0
Vehicle interest, net |  |  |  |  |  |  |  |  | (270) | (228) | (207)
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 |  |  |  |  |  |  |  |  | (2,364) | (2,313) | (2,395)
Income before income taxes |  |  |  |  |  |  |  |  | 0 | 0 | 0
Provision for (benefit from) income taxes |  |  |  |  |  |  |  |  | 0 | 0 | 0
Equity in earnings (loss) of subsidiaries |  |  |  |  |  |  |  |  | (1,532) | (1,423) | (2,314)
Net income |  |  |  |  |  |  |  |  | (1,532) | (1,423) | (2,314)
Total comprehensive income |  |  |  |  |  |  |  |  | (1,495) | (1,126) | (2,691)
Payments for (Proceeds from) Other Investing Activities |  |  |  |  |  |  |  |  | 75 | 0 | (320)
Net Cash Provided by (Used in) Investing Activities |  |  |  |  |  |  |  |  | $ 75 | $ 404 | $ (56)

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