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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