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Stockholders' Equity (Accumulated Other Comprehensive Income) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Stockholders Equity [Line Items] |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  |  |  | $ (5) | $ 39
Currency Translation Adjustments, Balance |  |  | $ (3) | $ 71 |  |
Net Unrealized Gains (Losses) on Cash Flow Hedges, Balance | $ (22) | $ 14 | (22) | 14 |  |
Net Unrealized Gains on Available- For-Sale Securities, Balance |  |  | 0 | 2 |  |
Currency Translation Adjustments, Balance |  |  | (132) | (102) |  |
Accumulated Other Comprehensive Income, Balance |  |  | (133) | (24) |  |
Currency Translation Adjustments, Current period change | (31) | (8) | (21) | (61) |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax | (4) | 0 | (25) | 8 |  |
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax | (1) | (2) | (5) | (5) |  |
Other comprehensive income (loss) | (34) | (6) | (41) | (48) |  |
Currency Translation Adjustments, Balance | (24) | 17 | (24) | 17 |  |
Net Unrealized Gains (Losses) on Cash Flow Hedges, Balance |  |  | 2 | 5 |  |
Net Unrealized Gains on Available- For-Sale Securities, Balance | 0 | 0 | 0 | 0 |  |
Currency Translation Adjustments, Balance | (127) | (109) | (127) | (109) |  |
Accumulated Other Comprehensive Income, Balance | (173) | (78) | (173) | (78) |  |
Derivatives used in Net Investment Hedge, Net of Tax | 101 |  | 101 |  |  |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent |  |  | (21) | (61) |  |
Other Comprehensive Income Unrealized Gain Loss On Cash Flow Hedges Arising During Period Net Of Tax |  |  | (23) | 9 |  |
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax |  |  | (25) | 8 |  |
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax |  |  | 0 | 0 |  |
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 |  |  | (43) | (51) |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  | 2 | 3 |  |
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 |  |  | 2 | 1 |  |
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Reclassification Adjustments, after Tax |  |  | 0 | 0 |  |
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax |  |  | 1 | 1 |  |
Corporate Interest Expense [Member] |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax | 1 | 2 | 4 | 2 |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax | 0 | (1) | (2) | (1) |  |
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 | 6 |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax | $ 1 | $ 2 | 4 | 4 |  |
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) | (1)
AOCI 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) | 6
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, 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
Adjustments for New Accounting Pronouncement [Member] |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |
Currency Translation Adjustments, Balance |  |  | (3) | 78 |  |
Net Unrealized Gains on Available- For-Sale Securities, Balance |  |  | 0 | 0 |  |
Currency Translation Adjustments, Balance |  |  | (132) | (114) |  |
Accumulated Other Comprehensive Income, Balance |  |  | (132) | (30) |  |
Net Unrealized Gains (Losses) on Cash Flow Hedges, Balance |  |  | $ 3 | $ 6 |  |

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