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Acquisitions and Divestitures - Acquisitions (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 29, 2020 | Jun. 30, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |  |  |
Payments to acquire businesses |  |  | $ 310 | $ 50 | $ 0
Crude Oil Terminal |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash consideration |  | $ 44 |  |  |
FM Gathering LLC |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Payments to acquire businesses | $ 300 |  |  |  |
Property and equipment acquired |  |  | 115 |  |
Intangible assets acquired |  |  | $ 187 |  |
FM Gathering LLC | Minimum | Level 3 | Measurement Input, Discount Rate | Valuation Technique, Discounted Cash Flow |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Discount rate, intangible assets, estimate of risk, theoretical market participant |  |  | 18.00% |  |
FM Gathering LLC | Maximum | Level 3 | Measurement Input, Discount Rate | Valuation Technique, Discounted Cash Flow |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Discount rate, intangible assets, estimate of risk, theoretical market participant |  |  | 19.00% |  |

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