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Basis Of Presentation And Recently Issued Accounting Pronouncements (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Impact of ASU 2018-02 [Line Items] |  |  |  |  |  |
Cash and Cash Equivalents, at Carrying Value | $ 489 | $ 776 | $ 489 | $ 776 | $ 611 |
Document Period End Date |  |  | Jun. 30, 2018 |  |  |
Revenues | 2,328 | 2,238 | $ 4,296 | 4,077 |  |
Operating Costs and Expenses | (1,175) | (1,108) | (2,267) | (2,157) |  |
Costs and Expenses | (2,290) | (2,227) | (4,387) | (4,231) |  |
Income (loss) before income taxes | 38 | 11 | (91) | (154) |  |
Provision for (benefit from) income taxes | 12 | 8 | (30) | (50) |  |
Net Income (Loss) Attributable to Parent | 26 | 3 | (61) | (104) |  |
Comprehensive Income (Loss), Net of Tax, Attributable to Parent | (24) | 51 | (103) | (28) |  |
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent | 1,120 |  | 1,120 |  | 931 |
Total assets exclusive of assets under vehicle programs | 6,193 |  | 6,193 |  | 5,820 |
Assets | 20,919 |  | 20,919 |  | 17,699 |
Accounts payable and other current liabilities | 1,832 |  | 1,832 |  | 1,619 |
Total current liabilities | 1,856 |  | 1,856 |  | 1,645 |
Other non-current liabilities | 745 |  | 745 |  | 717 |
Total Liabilities Exclusive Of Liabilities Under Vehicle Programs | 6,145 |  | 6,145 |  | 5,935 |
Retained Earnings (Accumulated Deficit) | (1,316) |  | (1,316) |  | (1,222) |
Total stockholders’ equity | 372 |  | 372 |  | 573 |
Program cash | 161 | 65 | 161 | 65 | 283 |
Restricted Cash and Cash Equivalents | 11 | 7 | 11 | 7 |  |
Decrease Increase In Program Cash |  |  |  | 0 |  |
Payments for (Proceeds from) Other Investing Activities |  |  | 37 | 0 |  |
Net Cash Provided by (Used in) Investing Activities |  |  | (3,748) | (3,186) |  |
Effect of changes in exchange rates on cash and cash equivalents, program and restricted cash |  |  | (2) | 36 |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect |  |  | (240) | 128 |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 661 | 848 | 661 | 848 | 901 | $ 720
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  |  |  | 6 |
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |  |  |  |  |
Impact of ASU 2018-02 [Line Items] |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  |  |  | 12 |
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] |  |  |  |  |  |
Impact of ASU 2018-02 [Line Items] |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  |  |  | 2 |
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |  |  |  |  |  |
Impact of ASU 2018-02 [Line Items] |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  |  |  | (1) |
Accumulated Foreign Currency Adjustment Attributable to Parent [Member] |  |  |  |  |  |
Impact of ASU 2018-02 [Line Items] |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  |  |  | (7) |
Accounting Standards Update 2018-02 [Member] |  |  |  |  |  |
Impact of ASU 2018-02 [Line Items] |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  |  |  | 4 |
Accounting Standards Update 2018-02 [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |  |  |  |  |
Impact of ASU 2018-02 [Line Items] |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  |  |  | (12) |
Accounting Standards Update 2018-02 [Member] | Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] |  |  |  |  |  |
Impact of ASU 2018-02 [Line Items] |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  |  |  | 0 |
Accounting Standards Update 2018-02 [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |  |  |  |  |  |
Impact of ASU 2018-02 [Line Items] |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  |  |  | 1 |
Accounting Standards Update 2018-02 [Member] | Accumulated Foreign Currency Adjustment Attributable to Parent [Member] |  |  |  |  |  |
Impact of ASU 2018-02 [Line Items] |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  |  |  | $ 7 |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] |  |  |  |  |  |
Impact of ASU 2018-02 [Line Items] |  |  |  |  |  |
Revenues |  |  | 4,303 |  |  |
Operating Costs and Expenses |  |  | (2,268) |  |  |
Costs and Expenses |  |  | (4,388) |  |  |
Income (loss) before income taxes |  |  | (85) |  |  |
Provision for (benefit from) income taxes |  |  | (28) |  |  |
Net Income (Loss) Attributable to Parent |  |  | (57) |  |  |
Comprehensive Income (Loss), Net of Tax, Attributable to Parent |  |  | (99) |  |  |
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent | 1,108 |  | 1,108 |  |  |
Total assets exclusive of assets under vehicle programs | 6,181 |  | 6,181 |  |  |
Assets | 20,907 |  | 20,907 |  |  |
Accounts payable and other current liabilities | 1,826 |  | 1,826 |  |  |
Total current liabilities | 1,850 |  | 1,850 |  |  |
Other non-current liabilities | 695 |  | 695 |  |  |
Total Liabilities Exclusive Of Liabilities Under Vehicle Programs | 6,095 |  | 6,095 |  |  |
Retained Earnings (Accumulated Deficit) | (1,272) |  | (1,272) |  |  |
Total stockholders’ equity | 416 |  | 416 |  |  |
Restatement Adjustment [Member] |  |  |  |  |  |
Impact of ASU 2018-02 [Line Items] |  |  |  |  |  |
Revenues |  |  | (7) |  |  |
Operating Costs and Expenses |  |  | (1) |  |  |
Costs and Expenses |  |  | (1) |  |  |
Income (loss) before income taxes |  |  | (6) |  |  |
Provision for (benefit from) income taxes |  |  | (2) |  |  |
Net Income (Loss) Attributable to Parent |  |  | (4) |  |  |
Comprehensive Income (Loss), Net of Tax, Attributable to Parent |  |  | (4) |  |  |
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent | 12 |  | 12 |  |  |
Total assets exclusive of assets under vehicle programs | 12 |  | 12 |  |  |
Assets | 12 |  | 12 |  |  |
Accounts payable and other current liabilities | 6 |  | 6 |  |  |
Total current liabilities | 6 |  | 6 |  |  |
Other non-current liabilities | 50 |  | 50 |  |  |
Total Liabilities Exclusive Of Liabilities Under Vehicle Programs | 50 |  | 50 |  |  |
Retained Earnings (Accumulated Deficit) | (44) |  | (44) |  |  |
Total stockholders’ equity | $ (44) |  | $ (44) |  |  |
Scenario, Previously Reported [Member] |  |  |  |  |  |
Impact of ASU 2018-02 [Line Items] |  |  |  |  |  |
Decrease Increase In Program Cash |  |  |  | 168 |  |
Payments for (Proceeds from) Other Investing Activities |  |  |  | (1) |  |
Net Cash Provided by (Used in) Investing Activities |  |  |  | (3,019) |  |
Effect of changes in exchange rates on cash and cash equivalents, program and restricted cash |  |  |  | 27 |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect |  |  |  | 286 |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents |  | 776 |  | 776 |  | 490
Restatement Adjustment [Member] |  |  |  |  |  |
Impact of ASU 2018-02 [Line Items] |  |  |  |  |  |
Decrease Increase In Program Cash |  |  |  | (168) |  |
Payments for (Proceeds from) Other Investing Activities |  |  |  | 1 |  |
Net Cash Provided by (Used in) Investing Activities |  |  |  | (167) |  |
Effect of changes in exchange rates on cash and cash equivalents, program and restricted cash |  |  |  | 9 |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect |  |  |  | (158) |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents |  | $ 72 |  | $ 72 |  | $ 230

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