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Stockholders' Equity (Components Of Other Comprehensive Income) (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Equity [Abstract]    
Net loss $ (87) $ (107)
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Document Fiscal Year Focus 2018  
Currency translation adjustments (net of tax of $5 and $3, respectively) (b) $ 1 25
Net unrealized gain (loss) on available-for-sale securities (net of tax of $0 and $0, respectively) 0 0
Net unrealized gain (loss) on cash flow hedges (net of tax of $(2) and $0, respectively) 6 1
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax 1 2
Other comprehensive income (loss) 8 28
Total comprehensive income (loss) $ (79) (79)
Document Period End Date Mar. 31, 2018  
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax $ 0 1
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax 5 3
Other Comprehensive Income (Loss), Available-for-sale Securities, Tax 0 0
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax (2) 0
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, Tax (1) (1)
Corporate Interest Expense [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax 1  
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax 1  
Selling, General and Administrative Expenses [Member]    
Accumulated Other Comprehensive Income (Loss) [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  
Including Beginning Balance Adjustment due to Cumulative Effect of Accounting Change [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other comprehensive income (loss) $ 8 $ 28