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Acquisitions, Divestitures and Asset Impairments (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Apr. 30, 2020 | Feb. 29, 2020 | Dec. 31, 2020 | Mar. 31, 2020 | Sep. 30, 2020 | Sep. 30, 2019
Business Acquisition [Line Items] |  |  |  |  |  |
Payments to acquire businesses |  |  |  |  | $ 310 | $ 47
Proceeds from sale of assets |  |  |  |  | $ 246 | $ 8
Level 3 | Measurement Input, Discount Rate | Valuation Technique, Discounted Cash Flow |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Discount rate, asset impairment analysis, cost of capital, theoretical market participant |  |  |  |  | 14.00% |
(Gains)/losses on asset sales and asset impairments, net |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Non-cash impairment losses upon classification to assets held for sale |  |  |  | $ 167 |  |
Non-cash impairment losses, long-lived assets |  |  |  |  | $ 446 |
Transportation and Facilities Segments |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Non-cash impairment losses, held and used |  |  |  |  | 648 |
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% |
Saddlehorn Pipeline Company, LLC |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Ownership percentage sold |  | 10.00% |  |  |  |
Proceeds from sale of interest in unconsolidated entity |  | $ 78 |  |  |  |
Saddlehorn Pipeline Company, LLC | Gain on/(impairment of) investments in unconsolidated entities, net |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Gain on sale of investment in unconsolidated entity |  | $ 21 |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Other current assets |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Assets held for sale |  |  |  |  | $ 224 |
Los Angeles Basin Crude Oil Terminals | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Facilities | Subsequent Event |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Proceeds from sale of assets |  |  | $ 200 |  |  |
NGL Terminals | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Facilities |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Proceeds from sale of assets | $ 163 |  |  |  |  |

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