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Debt - Fair Value of Other Financial Instruments (Table) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair Value of Debt $ 11,508us-gaap_LongTermDebt $ 11,535us-gaap_LongTermDebt
Short-term Debt [Member] | Reported Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair Value of Debt 885us-gaap_LongTermDebt
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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/ us-gaap_FairValueByMeasurementBasisAxis
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/ us-gaap_FinancialInstrumentAxis
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/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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/ us-gaap_FairValueByMeasurementBasisAxis
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Short-term Debt [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair Value of Debt 895us-gaap_LongTermDebt
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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/ us-gaap_FairValueByMeasurementBasisAxis
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/ us-gaap_FinancialInstrumentAxis
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/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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/ us-gaap_FairValueByMeasurementBasisAxis
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/ us-gaap_FinancialInstrumentAxis
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Long-term Debt [Member] | Reported Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair Value of Debt 10,614us-gaap_LongTermDebt
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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/ us-gaap_FairValueByMeasurementBasisAxis
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/ us-gaap_FairValueByMeasurementBasisAxis
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= us-gaap_LongTermDebtMember
Long-term Debt [Member] | Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair Value of Debt 0us-gaap_LongTermDebt
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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/ us-gaap_FairValueByMeasurementBasisAxis
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/ us-gaap_FairValueByMeasurementBasisAxis
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Long-term Debt [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair Value of Debt 10,762us-gaap_LongTermDebt
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_LongTermDebtMember		 11,656us-gaap_LongTermDebt
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_LongTermDebtMember
Long-term Debt [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair Value of Debt $ 0us-gaap_LongTermDebt
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_LongTermDebtMember		 $ 0us-gaap_LongTermDebt
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