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Trade Accounts Receivable, Net - Trade Accounts Receivable, Net (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Receivables [Abstract]    
Trade accounts receivable $ 919us-gaap_AccountsReceivableGrossCurrent $ 1,058us-gaap_AccountsReceivableGrossCurrent
Allowance for doubtful accounts (8)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent (9)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Total $ 911us-gaap_AccountsReceivableNetCurrent $ 1,049us-gaap_AccountsReceivableNetCurrent