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Stockholders' Equity (Narrative) (Detail) - USD ($) shares in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Stockholders Equity [Line Items] |  |  |  |
Currency translation adjustments (net of tax of $17, $(5), $20 and $4, respectively) | $ 48,000,000 | $ 8,000,000 | $ 73,000,000 | $ 80,000,000
Proceeds from Issuance of Preferred Stock, Preference Stock, and Warrants |  |  | $ 90 |
Document Period End Date |  |  | Jun. 30, 2017 |
Document Fiscal Year Focus |  |  | 2017 |
Other Comprehensive Income Unrealized Gain Loss On Cash Flow Hedges Arising During Period Net Of Tax |  |  | $ (2,000,000) | (10,000,000)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax |  |  | 1,000,000 | 2,000,000
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax |  |  | (1,000,000) | $ (8,000,000)
Stock Repurchase Program, Authorized Amount | 1,500,000,000 |  | $ 1,500,000,000 |
Stock Repurchased During Period, Shares |  |  | 3.4 | 6.5
Stock Repurchased During Period, Value |  |  | $ 100,000,000 | $ 180,000,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount | 200,000,000 |  | 200,000,000 |
Selling, General and Administrative Expenses [Member] |  |  |  |
Stockholders Equity [Line Items] |  |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax | 2,000,000 | 2,000,000 | 4,000,000 | 3,000,000
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax | $ 2,000,000 | $ 1,000,000 | $ 3,000,000 | $ 2,000,000

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