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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
Sep. 30, 2014
Gathering and Processing Equipment [Member]
 
Other Commitments [Line Items]  
Other Commitment, Remainder of Fiscal Year $ 616
Other Commitment, Due in Second Year 1,852
Other Commitment, Due in Third Year 1,933
Other Commitment, Due in Fourth Year 1,951
Other Commitment, Due in Fifth Year 1,748
Other Commitment, Due after Fifth Year 7,672
Other Commitment $ 15,772