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Summary of Significant Accounting Policies - Additional Information (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
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Equity Securities without Readily Determinable Fair Value, Amount | $ 8 |  |  |  |  |  |  |  | $ 8 |  |  |
Deferred Revenue | 187 |  |  |  | $ 194 |  |  |  | 187 | $ 194 |  |
Revenues | 2,050 | $ 2,778 | $ 2,328 | $ 1,968 | 2,019 | $ 2,752 | $ 2,238 | $ 1,839 | 9,124 | 8,848 | $ 8,659 |
Cash and cash equivalents | 615 |  |  |  | 611 |  |  |  | 615 | 611 |  |
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
Currency translation adjustment | 3 |  |  |  | (71) |  |  |  | 3 | (71) | 39 | 80
Net carrying value of software developed | 188 |  |  |  | 196 |  |  |  | 188 | 196 |  |
Vehicle interest income |  |  |  |  |  |  |  |  | 15 | 8 | 18 |
Advertising expense |  |  |  |  |  |  |  |  | 116 | 111 | 127 |
Investments in joint ventures | 48 |  |  |  | 32 |  |  |  | 48 | 32 |  |
Retained risks of liability to third parties | 421 |  |  |  | 422 |  |  |  | 421 | 422 |  |
Workers compensation liabilities | 60 |  |  |  | 66 |  |  |  | 60 | 66 |  |
Gain or loss of currency transactions |  |  |  |  |  |  |  |  | (3) | (3) | 6 |
Increase (Decrease) in Customer Loyalty Program Liability |  |  |  |  |  |  |  |  | 50 |  |  |
Increase (Decrease) in Customer Loyalty Program Liability (Net of Tax) |  |  |  |  |  |  |  |  | 40 |  |  |
Deferred Revenue, Additions |  |  |  |  |  |  |  |  | 1,982 |  |  |
Deferred Revenue, Revenue Recognized |  |  |  |  |  |  |  |  | 1,989 |  |  |
Operating Costs and Expenses |  |  |  |  |  |  |  |  | 4,639 | 4,472 | 4,382 |
Costs and Expenses |  |  |  |  |  |  |  |  | 8,857 | 8,637 | 8,380 |
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest |  |  |  |  |  |  |  |  | 267 | 211 | 279 |
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | 102 | (150) | 116 |
Net income |  |  |  |  |  |  |  |  | 165 | 361 | 163 |
Net Income (Loss) Attributable to Parent | 13 | $ 213 | $ 26 | $ (87) | 220 | $ 245 | $ 3 | $ (107) |  |  |  |
Comprehensive Income (Loss), Net of Tax, Attributable to Parent |  |  |  |  |  |  |  |  | 62 | 491 | 156 |
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent | 1,301 |  |  |  | 931 |  |  |  | 1,301 | 931 |  |
Total Assets Exclusive Of Assets Under Vehicle Programs | 6,370 |  |  |  | 5,820 |  |  |  | 6,370 | 5,820 |  |
Assets | 19,149 |  |  |  | 17,699 |  |  |  | 19,149 | 17,699 |  |
Accounts Payable and Accrued Liabilities, Current | 1,693 |  |  |  | 1,619 |  |  |  | 1,693 | 1,619 |  |
Liabilities, Current | 1,716 |  |  |  | 1,645 |  |  |  | 1,716 | 1,645 |  |
Other Liabilities, Noncurrent | 767 |  |  |  | 717 |  |  |  | 767 | 717 |  |
Total Liabilities Exclusive Of Liabilities Under Vehicle Programs | 6,011 |  |  |  | 5,935 |  |  |  | 6,011 | 5,935 |  |
Retained Earnings (Accumulated Deficit) | (1,091) |  |  |  | (1,222) |  |  |  | (1,091) | (1,222) |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 414 |  |  |  | 573 |  |  |  | 414 | 573 | $ 221 | $ 439
Income (Loss) from Equity Method Investments |  |  |  |  |  |  |  |  | 5 |  |  |
Assets Held-for-sale, Not Part of Disposal Group, Current, Other | 25 |  |  |  |  |  |  |  | 25 |  |  |
Gain on Sale of Investments |  |  |  |  |  |  |  |  | 4 |  |  |
Operating Lease, Right-of-Use Asset | 3,000 |  |  |  |  |  |  |  | 3,000 |  |  |
Accounting Standards Update 2016-02 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  |  |  | (4) |  |  |  |  | (4) |  |
Accumulated Foreign Currency Adjustment Attributable to Noncontrolling Interest [Member] | Accounting Standards Update 2016-02 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  |  |  | (7) |  |  |  |  | (7) |  |
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] | Accounting Standards Update 2016-02 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  |  |  | 12 |  |  |  |  | 12 |  |
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  |  |  | 2 |  |  |  |  | 2 |  |
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] | Accounting Standards Update 2016-02 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  |  |  | 0 |  |  |  |  | 0 |  |
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  |  |  | (1) |  |  |  |  | (1) |  |
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Accounting Standards Update 2016-02 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  |  |  | $ (1) |  |  |  |  | $ (1) |  |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 9,124 |  |  |
Operating Costs and Expenses |  |  |  |  |  |  |  |  | 4,642 |  |  |
Costs and Expenses |  |  |  |  |  |  |  |  | 8,860 |  |  |
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent |  |  |  |  |  |  |  |  | 264 |  |  |
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | 101 |  |  |
Net Income (Loss) Attributable to Parent |  |  |  |  |  |  |  |  | 163 |  |  |
Comprehensive Income (Loss), Net of Tax, Attributable to Parent |  |  |  |  |  |  |  |  | 60 |  |  |
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent | 1,292 |  |  |  |  |  |  |  | 1,292 |  |  |
Total Assets Exclusive Of Assets Under Vehicle Programs | 6,361 |  |  |  |  |  |  |  | 6,361 |  |  |
Assets | 19,140 |  |  |  |  |  |  |  | 19,140 |  |  |
Accounts Payable and Accrued Liabilities, Current | 1,688 |  |  |  |  |  |  |  | 1,688 |  |  |
Liabilities, Current | 1,711 |  |  |  |  |  |  |  | 1,711 |  |  |
Other Liabilities, Noncurrent | 725 |  |  |  |  |  |  |  | 725 |  |  |
Total Liabilities Exclusive Of Liabilities Under Vehicle Programs | 5,964 |  |  |  |  |  |  |  | 5,964 |  |  |
Retained Earnings (Accumulated Deficit) | (1,053) |  |  |  |  |  |  |  | (1,053) |  |  |
Stockholders' Equity Attributable to Parent | 452 |  |  |  |  |  |  |  | 452 |  |  |
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 0 |  |  |
Other Operating Income (Expense), Net |  |  |  |  |  |  |  |  | (3) |  |  |
Costs and Expenses |  |  |  |  |  |  |  |  | (3) |  |  |
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent |  |  |  |  |  |  |  |  | 3 |  |  |
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | 1 |  |  |
Net Income (Loss) Attributable to Parent |  |  |  |  |  |  |  |  | 2 |  |  |
Comprehensive Income (Loss), Net of Tax, Attributable to Parent |  |  |  |  |  |  |  |  | 2 |  |  |
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent | 9 |  |  |  |  |  |  |  | 9 |  |  |
Total Assets Exclusive Of Assets Under Vehicle Programs | 9 |  |  |  |  |  |  |  | 9 |  |  |
Assets | 9 |  |  |  |  |  |  |  | 9 |  |  |
Accounts Payable and Accrued Liabilities, Current | 5 |  |  |  |  |  |  |  | 5 |  |  |
Liabilities, Current | 5 |  |  |  |  |  |  |  | 5 |  |  |
Other Liabilities, Noncurrent | 42 |  |  |  |  |  |  |  | 42 |  |  |
Total Liabilities Exclusive Of Liabilities Under Vehicle Programs | 47 |  |  |  |  |  |  |  | 47 |  |  |
Retained Earnings (Accumulated Deficit) | (38) |  |  |  |  |  |  |  | (38) |  |  |
Stockholders' Equity Attributable to Parent | $ (38) |  |  |  |  |  |  |  | $ (38) |  |  |

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