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Stockholders' Equity (Accumulated Other Comprehensive Income) (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
Stockholders Equity [Line Items] |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  |  |  | $ (6)
Document Period End Date |  |  | Sep. 30, 2018 |  |
Currency Translation Adjustments, Balance |  |  | $ 71 | $ (39) |
Net Unrealized Gains (Losses) on Cash Flow Hedges, Balance | $ 14 | $ 2 | 14 | 2 |
Net Unrealized Gains on Available- For-Sale Securities, Balance |  |  | 2 | 1 |
Currency Translation Adjustments, Balance |  |  | (102) | (118) |
Accumulated Other Comprehensive Income, Balance |  |  | (24) | (154) |
Currency Translation Adjustments, Current period change | (8) | 32 | (61) | 105 |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax | 0 | 1 | 8 | 0 |
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax | (2) | (1) | (5) | (4) |
Other comprehensive income (loss) | (6) | 34 | (48) | 110 |
Currency Translation Adjustments, Balance | 17 | 66 | 17 | 66 |
Net Unrealized Gains (Losses) on Cash Flow Hedges, Balance |  |  | 5 | 2 |
Net Unrealized Gains on Available- For-Sale Securities, Balance | 0 | 2 | 0 | 2 |
Currency Translation Adjustments, Balance | (109) | (114) | (109) | (114) |
Accumulated Other Comprehensive Income, Balance | (78) | (44) | (78) | (44) |
Derivatives used in Net Investment Hedge, Net of Tax | 56 |  | 56 |  |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent |  |  | (61) | 105 |
Other Comprehensive Income Unrealized Gain Loss On Cash Flow Hedges Arising During Period Net Of Tax |  |  | 9 | (2) |
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax |  |  | 8 | 0 |
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax | 0 | 0 | 0 | 1 |
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net (Gain) Loss, Net of Tax |  |  | 4 | 4 |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax |  |  | (51) | 104 |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  | 3 | 6 |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax |  |  | 0 | 0 |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax |  |  | 0 | 0 |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax |  |  | 1 | (2) |
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Reclassification Adjustments, Net of Tax |  |  | 0 | 1 |
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax |  |  | 1 | 0 |
Corporate Interest Expense [Member] |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax | 2 | 1 | 2 | 3 |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax | (1) | (1) |  | (2) |
Selling, General and Administrative Expenses [Member] |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax | 2 | 2 | 6 |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax | $ 2 | $ 1 | 4 | 4 |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax |  |  |  | $ 6 |
Accumulated Foreign Currency Adjustment Attributable to Parent [Member] |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  |  |  | 7
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  |  |  | 1
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  |  |  | (2)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  |  |  | $ (12)
Including Beginning Balance Adjustment due to Cumulative Effect of Accounting Change [Member] |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |
Currency Translation Adjustments, Balance |  |  | 78 |  |
Net Unrealized Gains on Available- For-Sale Securities, Balance |  |  | 0 |  |
Currency Translation Adjustments, Balance |  |  | (114) |  |
Accumulated Other Comprehensive Income, Balance |  |  | (30) |  |
Net Unrealized Gains (Losses) on Cash Flow Hedges, Balance |  |  | $ 6 |  |

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