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Basis Of Presentation And Recently Issued Accounting Pronouncements (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Impact of ASU 2018-02 [Line Items] |  |  |  |  |  |
Cash and Cash Equivalents, at Carrying Value | $ 605 | $ 814 | $ 605 | $ 814 | $ 611 |
Document Period End Date |  |  | Sep. 30, 2018 |  |  |
Revenues | 2,778 | 2,752 | $ 7,074 | 6,829 |  |
Operating Costs and Expenses | (1,294) | (1,256) | (3,561) | (3,413) |  |
Costs and Expenses | (2,423) | (2,388) | (6,810) | (6,619) |  |
Income before income taxes | 355 | 364 | 264 | 210 |  |
Provision for income taxes | 142 | 119 | 112 | 69 |  |
Net Income (Loss) Attributable to Parent | 213 | 245 | 152 | 141 |  |
Comprehensive Income (Loss), Net of Tax, Attributable to Parent | 207 | 279 | 104 | 251 |  |
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent | 1,065 |  | 1,065 |  | 931 |
Total assets exclusive of assets under vehicle programs | 6,139 |  | 6,139 |  | 5,820 |
Assets | 19,741 |  | 19,741 |  | 17,699 |
Accounts payable and other current liabilities | 1,885 |  | 1,885 |  | 1,619 |
Total current liabilities | 1,908 |  | 1,908 |  | 1,645 |
Other non-current liabilities | 767 |  | 767 |  | 717 |
Total Liabilities Exclusive Of Liabilities Under Vehicle Programs | 6,213 |  | 6,213 |  | 5,935 |
Retained Earnings (Accumulated Deficit) | (1,103) |  | (1,103) |  | (1,222) |
Total stockholders’ equity | 521 |  | 521 |  | 573 |
Program cash | 151 | 180 | 151 | 180 | 283 |
Restricted Cash and Cash Equivalents | 12 | 7 | 12 | 7 |  |
Decrease Increase In Program Cash |  |  |  | 0 |  |
Payments for (Proceeds from) Other Investing Activities |  |  | (44) | 6 |  |
Net Cash Provided by (Used in) Investing Activities |  |  | (3,677) | (2,976) |  |
Effect of changes in exchange rates on cash and cash equivalents, program and restricted cash |  |  | (5) | 41 |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect |  |  | (133) | 281 |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 768 | 1,001 | 768 | 1,001 | 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 |  |  | 7,083 |  |  |
Operating Costs and Expenses |  |  | (3,564) |  |  |
Costs and Expenses |  |  | (6,813) |  |  |
Income before income taxes |  |  | 270 |  |  |
Provision for income taxes |  |  | 114 |  |  |
Net Income (Loss) Attributable to Parent |  |  | 156 |  |  |
Comprehensive Income (Loss), Net of Tax, Attributable to Parent |  |  | 108 |  |  |
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent | 1,053 |  | 1,053 |  |  |
Total assets exclusive of assets under vehicle programs | 6,127 |  | 6,127 |  |  |
Assets | 19,729 |  | 19,729 |  |  |
Accounts payable and other current liabilities | 1,879 |  | 1,879 |  |  |
Total current liabilities | 1,902 |  | 1,902 |  |  |
Other non-current liabilities | 717 |  | 717 |  |  |
Total Liabilities Exclusive Of Liabilities Under Vehicle Programs | 6,163 |  | 6,163 |  |  |
Retained Earnings (Accumulated Deficit) | (1,059) |  | (1,059) |  |  |
Total stockholders’ equity | 565 |  | 565 |  |  |
Restatement Adjustment [Member] |  |  |  |  |  |
Impact of ASU 2018-02 [Line Items] |  |  |  |  |  |
Revenues |  |  | (9) |  |  |
Operating Costs and Expenses |  |  | (3) |  |  |
Costs and Expenses |  |  | (3) |  |  |
Income before income taxes |  |  | (6) |  |  |
Provision for 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 |  |  |  | 53 |  |
Payments for (Proceeds from) Other Investing Activities |  |  |  | (5) |  |
Net Cash Provided by (Used in) Investing Activities |  |  |  | (2,924) |  |
Effect of changes in exchange rates on cash and cash equivalents, program and restricted cash |  |  |  | 32 |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect |  |  |  | 324 |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents |  | 814 |  | 814 |  | 490
Restatement Adjustment [Member] |  |  |  |  |  |
Impact of ASU 2018-02 [Line Items] |  |  |  |  |  |
Decrease Increase In Program Cash |  |  |  | (53) |  |
Payments for (Proceeds from) Other Investing Activities |  |  |  | (1) |  |
Net Cash Provided by (Used in) Investing Activities |  |  |  | (52) |  |
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 |  |  |  | (43) |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents |  | $ 187 |  | $ 187 |  | $ 230

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