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Contingencies and Commitments (Tables) | 3 Months Ended
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Mar. 31, 2016
Commitments and Contingencies Disclosure [Abstract] |
Gathering, Processing and Transportation Commitments | The aggregate undiscounted commitments under our gathering, processing and transportation agreements, excluding any reimbursement from working interest and royalty interest owners, credits for third-party volumes or future costs under cost-of-service agreements, are presented below.
|  | March 31, 2016
|  | ($ in millions)
2016 |  | $ | 1,383 |
2017 |  | 1,880 |
2018 |  | 1,676 |
2019 |  | 1,378 |
2020 |  | 1,051 |
2021 – 2099 |  | 6,696 |
Total |  | $ | 14,064 |

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- Definition Tabular disclosure of the aggregate amount of payments due on known contractual obligations for the five years following the date of the latest balance sheet and the combined aggregate amount of maturities of known contractual obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 303 -Paragraph a -Subparagraph 5 + Details
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