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Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Allowance for Trade Receivables [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period $ 8 $ 9 $ 10
Translation adjustment 0    
Charged to costs and expenses 2 1 2
Additions/ (Deductions) (3) (2) (3)
Balance at end of period 7 8 9
Valuation Allowance of Deferred Tax Assets [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period 1,607 1,454 1,634
Translation adjustment (28) (30) 7
Charged to costs and expenses 24 201 67
Additions/ (Deductions) (18) (18) (254)
Balance at end of period $ 1,585 $ 1,607 $ 1,454