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Commitments - Undiscounted Gathering Processing and Transportation Agreements Commitments Table (Details) (Gathering and Processing Equipment [Member], USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Gathering and Processing Equipment [Member]
 
Other Commitments [Line Items]  
Gathering, Processing and Transportation Commitment, Remainder of Year $ 1,359us-gaap_OtherCommitmentsFutureMinimumPaymentsRemainderOfFiscalYear
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_GasGatheringAndProcessingEquipmentMember
Gathering, Processing and Transportation Commitment, Due in Second Year 1,926us-gaap_OtherCommitmentDueInSecondYear
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_GasGatheringAndProcessingEquipmentMember
Gathering, Processing and Transportation Commitment, Due in Third Year 1,932us-gaap_OtherCommitmentDueInThirdYear
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_GasGatheringAndProcessingEquipmentMember
Gathering, Processing and Transportation Commitment, Due in Fourth Year 1,713us-gaap_OtherCommitmentDueInFourthYear
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_GasGatheringAndProcessingEquipmentMember
Gathering, Processing and TransportationCommitment, Due in Fifth Year 1,428us-gaap_OtherCommitmentDueInFifthYear
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_GasGatheringAndProcessingEquipmentMember
Gathering, Processing and Transportation Commitment, Due after Fifth Year 6,173us-gaap_OtherCommitmentDueAfterFifthYear
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_GasGatheringAndProcessingEquipmentMember
Gathering, Processing and Transportation Commitment $ 14,531us-gaap_OtherCommitment
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_GasGatheringAndProcessingEquipmentMember