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Stockholders' Equity (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Stockholders Equity [Line Items] |  |
Currency translation adjustments (net of tax of $(6) and $5, respectively) | $ 1 | $ 1
Document Period End Date | Mar. 31, 2019 |
Document Fiscal Year Focus | 2019 |
Other Comprehensive Income Unrealized Gain Loss On Cash Flow Hedges Arising During Period Net Of Tax | $ (7) | 6
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax | (1) | 0
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax | (8) | $ 6
Stock Repurchase Program, Authorized Amount | 1,700 |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | 150 |
Selling, General and Administrative Expenses [Member] |  |
Stockholders Equity [Line Items] |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax | 2 |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax | $ 1 |

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