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Valuation and Qualifying Accounts (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period $ 18 $ 13 $ 9
Additions Charged to Costs & Expenses 1 2 5
Allowance for doubtful accounts, Charged to Other Accounts 0 [1] 3 [1] 0 [1]
Deductions 1 0 1
Balance at End of Period 18 18 13
Deferred tax valuation Allowance
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period 9 0 0
Additions Charged to Costs & Expenses 4 9 0
Allowance for doubtful accounts, Charged to Other Accounts 0 0 0
Deductions 0 0 0
Balance at End of Period $ 13 $ 9 $ 0
[1] The allowance for doubtful accounts increased by $3 million for the year ended December 31, 2012 due to reserves from acquired entities