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Related Party Transactions (Schedule of Related Party Receivables Payables) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Related Party Transaction [Line Items]    
Receivables from related parties $ 2,709us-gaap_AccountsReceivableNetCurrent $ 2,363us-gaap_AccountsReceivableNetCurrent
Affiliated Entity    
Related Party Transaction [Line Items]    
Receivables from related parties 178us-gaap_AccountsReceivableNetCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember		 109us-gaap_AccountsReceivableNetCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember
Accounts and notes payable to related parties $ 209us-gaap_DueToRelatedPartiesCurrentAndNoncurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember		 $ 67us-gaap_DueToRelatedPartiesCurrentAndNoncurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember