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SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Allowance for doubtful accounts      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period $ 19 $ 18 $ 18
Additions Charged to Costs & Expenses 5 3 1
Charged to Other Accounts 0 0 0
Deductions 2 2 1
Balance at End of Period 22 19 18
Deferred tax valuation allowance      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 20 13 9
Additions Charged to Costs & Expenses 5 7 4
Charged to Other Accounts 0 0 0
Deductions 0 0 0
Balance at End of Period $ 25 $ 20 $ 13