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Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Allowance for Trade Receivables [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period $ 12 $ 7 $ 8
Charged to costs and expenses   3 2
Additions/ (Deductions) 3 2 (3)
Balance at end of period 15 12 7
Valuation Allowance of Deferred Tax Assets [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period 1,578 1,585 1,607
Translation adjustment 24 (4) (28)
Charged to costs and expenses 3 13 24
Additions/ (Deductions) (103) (16) (18)
Balance at end of period $ 1,502 $ 1,578 $ 1,585