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Organization and Basis of Presentation (Non Consolidated Variable Interest Entities) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Variable Interest Entity [Line Items]    
Notes receivable $ 88us-gaap_NotesAndLoansReceivableNetNoncurrent $ 90us-gaap_NotesAndLoansReceivableNetNoncurrent
Variable Interest Entity, Not Primary Beneficiary [Member]    
Variable Interest Entity [Line Items]    
Other investments 136us-gaap_OtherInvestments
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember		 134us-gaap_OtherInvestments
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember
Notes receivable $ 15us-gaap_NotesAndLoansReceivableNetNoncurrent
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember		 $ 15us-gaap_NotesAndLoansReceivableNetNoncurrent
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember