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Other Financial Data (Accounts Receivable, Net) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Accounts receivable $ 1,444us-gaap_AccountsReceivableGrossCurrent $ 1,422us-gaap_AccountsReceivableGrossCurrent
Less allowance for doubtful accounts (35)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent (53)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Accounts receivable, net $ 1,409us-gaap_AccountsReceivableNetCurrent $ 1,369us-gaap_AccountsReceivableNetCurrent