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Acquisitions and Divestitures (3) Hiland (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Feb. 13, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Business Acquisition [Line Items] |  |  |  |
Repayments of Debt Assumed |  | $ 11,064 | $ 10,060 | $ 15,116
Hiland Partners, LP [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Combination, Consideration Transferred | $ 3,122 |  |  |
Repayments of Debt Assumed | $ 368 |  |  |
Finite-Lived Intangible Asset, Useful Life | 16 years 5 months |  |  |

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