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Contingencies and Commitments (Tables) | 9 Months Ended
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Sep. 30, 2018
Commitments and Contingencies Disclosure [Abstract] |
Schedule of contractual obligation | 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:
|  | September 30, 2018
|  | ($ in millions)
2018 |  | $ | 269 |
2019 |  | 1,048 |
2020 |  | 992 |
2021 |  | 900 |
2022 |  | 792 |
2023 – 2035 |  | 4,443 |
Total |  | $ | 8,444 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 303 -Paragraph a -Subparagraph 5 + Details
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