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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Advertising Expense | $ 54 | $ 121 | $ 116 |
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures | 63 | 56 |  |
Other related Revenue | 159 | 144 |  |
Equity Securities without Readily Determinable Fair Value, Amount | 8 |  |  |
Revenues | 5,402 | 9,172 | 9,124 |
Currency translation adjustment | 40 | 9 | (3) | $ 71
Net carrying value of software developed | 265 | 261 |  |
Vehicle interest income | 12 | 15 | 15 |
Retained risks of liability to third parties | 396 | 441 |  |
Workers compensation liabilities | 53 | 56 |  |
Operating Costs and Expenses | 3,322 | 4,698 | 4,639 |
Costs and Expenses | 6,358 | 8,885 | 8,857 |
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest | (956) | 287 | 267 |
Income Tax Expense (Benefit) | (272) | (15) | 102 |
Net income | (684) | 302 | 165 |
Comprehensive Income (Loss), Net of Tax, Attributable to Parent | (714) | 277 | 62 |
Total Assets Exclusive Of Assets Under Vehicle Programs | 8,365 | 9,311 |  |
Assets | 17,538 | 23,126 |  |
Accounts Payable and Accrued Liabilities, Current | 2,034 | 2,206 |  |
Liabilities, Current | 2,053 | 2,225 |  |
Other Liabilities, Noncurrent | 731 | 757 |  |
Total Liabilities Exclusive Of Liabilities Under Vehicle Programs | 9,053 | 8,538 |  |
Income (Loss) from Equity Method Investments | 10 | 5 |  |
Proceeds from Sale of Equity Method Investments | 64 |  |  |
Gain (Loss) on Sale of Equity Investments | 44 |  |  |
Gain on Sale of Investments | 4 |  |  |
Operating Lease, Right-of-Use Asset | 2,560 | 2,596 |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 765 | 900 | 735 | $ 901
Customer Loyalty [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Deferred Revenue | 34 | 59 | $ 64 |
Deferred Revenue, Additions | 26 | 17 |  |
Deferred Revenue, Revenue Recognized | 51 | 22 |  |
Deferred Revenue, Current | 17 | 22 |  |
Deferred Revenue, Noncurrent | 17 | 37 |  |
Property leases [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Operating Lease, Right-of-Use Asset | 2,560 | 2,596 |  |
Vehicle leases [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Operating Lease, Right-of-Use Asset | $ 113 | $ 195 |  |

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