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Basis Of Presentation And Recently Issued Accounting Pronouncements (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Impact of ASU 2018-02 [Line Items] |  |  |  |
Cash and Cash Equivalents, at Carrying Value | $ 544 | $ 923 | $ 611 |
Document Period End Date | Mar. 31, 2018 |  |  |
Net Unrealized Gain Or Loss Of Foreign Currency Transactions On Intercompany Loan Hedges | $ 1 |  |  |
Revenues | 1,968 | 1,839 |  |
Operating Costs and Expenses | (1,092) | (1,049) |  |
Costs and Expenses | (2,097) | (2,004) |  |
Loss before income taxes | (129) | (165) |  |
Benefit from income taxes | (42) | (58) |  |
Net Income (Loss) Attributable to Parent | (87) | (107) |  |
Comprehensive Income (Loss), Net of Tax, Attributable to Parent | (79) | (79) |  |
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent | 967 |  | 931 |
Total assets exclusive of assets under vehicle programs | 5,966 |  | 5,820 |
Assets | 19,222 |  | 17,699 |
Accounts payable and other current liabilities | 1,777 |  | 1,619 |
Total current liabilities | 1,803 |  | 1,645 |
Other non-current liabilities | 763 |  | 717 |
Total Liabilities Exclusive Of Liabilities Under Vehicle Programs | 6,147 |  | 5,935 |
Retained Earnings (Accumulated Deficit) | (1,344) |  | (1,222) |
Total stockholders’ equity | 455 |  | 573 |
Program cash | 147 | 142 | 283 |
Restricted Cash and Cash Equivalents | 10 | 5 |  |
Decrease Increase In Program Cash |  | 0 |  |
Net Cash Provided by (Used in) Investing Activities | (1,736) | (1,059) |  |
Effect of changes in exchange rates on cash and cash equivalents, program and restricted cash | 9 | 12 |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect | (200) | 350 |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 701 | 1,070 | 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 | 1,975 |  |  |
Operating Costs and Expenses | (1,093) |  |  |
Costs and Expenses | (2,098) |  |  |
Loss before income taxes | (123) |  |  |
Benefit from income taxes | (40) |  |  |
Net Income (Loss) Attributable to Parent | (83) |  |  |
Comprehensive Income (Loss), Net of Tax, Attributable to Parent | (75) |  |  |
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent | 955 |  |  |
Total assets exclusive of assets under vehicle programs | 5,954 |  |  |
Assets | 19,210 |  |  |
Accounts payable and other current liabilities | 1,771 |  |  |
Total current liabilities | 1,797 |  |  |
Other non-current liabilities | 713 |  |  |
Total Liabilities Exclusive Of Liabilities Under Vehicle Programs | 6,097 |  |  |
Retained Earnings (Accumulated Deficit) | (1,300) |  |  |
Total stockholders’ equity | 499 |  |  |
Restatement Adjustment [Member] |  |  |  |
Impact of ASU 2018-02 [Line Items] |  |  |  |
Revenues | (7) |  |  |
Operating Costs and Expenses | (1) |  |  |
Costs and Expenses | (1) |  |  |
Loss before income taxes | (6) |  |  |
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 |  |  |
Total assets exclusive of assets under vehicle programs | 12 |  |  |
Assets | 12 |  |  |
Accounts payable and other current liabilities | 6 |  |  |
Total current liabilities | 6 |  |  |
Other non-current liabilities | 50 |  |  |
Total Liabilities Exclusive Of Liabilities Under Vehicle Programs | 50 |  |  |
Retained Earnings (Accumulated Deficit) | (44) |  |  |
Total stockholders’ equity | $ (44) |  |  |
Scenario, Previously Reported [Member] |  |  |  |
Impact of ASU 2018-02 [Line Items] |  |  |  |
Decrease Increase In Program Cash |  | 87 |  |
Net Cash Provided by (Used in) Investing Activities |  | (972) |  |
Effect of changes in exchange rates on cash and cash equivalents, program and restricted cash |  | 8 |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect |  | 433 |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents |  | 923 |  | 490
Restatement Adjustment [Member] |  |  |  |
Impact of ASU 2018-02 [Line Items] |  |  |  |
Decrease Increase In Program Cash |  | (87) |  |
Net Cash Provided by (Used in) Investing Activities |  | (87) |  |
Effect of changes in exchange rates on cash and cash equivalents, program and restricted cash |  | 4 |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect |  | (83) |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents |  | $ 147 |  | $ 230

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