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Stockholders' Equity (Narrative) (Detail) shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 USD ($) shares | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) shares | Jun. 30, 2018 USD ($) shares | Aug. 01, 2019 USD ($)
Stockholders Equity [Line Items] |  |  |  |  |
Currency translation adjustments (net of tax of $4, $(10), $(2), and $(5) respectively) | $ 9 | $ (54) | $ 10 | $ (53) |
Stock Repurchased During Period, Shares | shares |  |  |  | 1.6 |
Stock Repurchased During Period, Value |  |  |  | $ 67 |
Other Comprehensive Income Unrealized Gain Loss On Cash Flow Hedges Arising During Period Net Of Tax |  |  | (19) | 8 |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax |  |  | (2) | 0 |
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax |  |  | (21) | 8 |
Stock Repurchase Program, Authorized Amount | 1,700 |  | 1,700 |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | 150 |  | 150 |  |
Option Premiums Paid | $ 16 |  | $ 16 |  |
Temporary Equity, Shares Outstanding | shares | 0.6 |  | 0.6 |  |
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 | $ 4 | 4 |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax | $ 2 | $ 1 | $ 3 | $ 2 |
Subsequent Event [Member] |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  | $ 100

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