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Investments in Unconsolidated Entities - Equity Method Investments (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Feb. 29, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Jun. 30, 2019
Investments in Unconsolidated Entities |  |  |  |  |  |  |  |  |
Investments in unconsolidated entities |  |  |  |  |  | $ 3,805 | $ 3,764 | $ 3,683 |
Capital contributions to equity method investees excluding capitalized interest |  |  |  |  |  | 82 | 445 | 504 |
Capitalized interest related to contributions to unconsolidated entities |  |  |  |  |  | 18 | 24 | 34 |
Amount by which investments in unconsolidated entities exceeded our share of the underlying equity in the net assets |  |  |  |  |  | 223 | 170 |  |
Equity Method Investees |  |  |  |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |  |  |  |
Capitalized interest related to contributions to unconsolidated entities |  |  |  |  |  | $ 12 | $ 16 | 20 |
Capline Pipeline Company LLC | Capline pipeline system |  |  |  |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |  |  |  |
Percentage of Capline pipeline system owned |  |  |  |  | 100.00% |  |  |  |
Undivided joint interest in Capline pipeline system |  |  |  |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |  |  |  |
Undivided joint interest ownership percentage |  |  |  |  | 54.00% |  |  |  |
Carrying value of undivided joint interest |  |  |  |  | $ 175 |  |  |  |
Level 3 | Measurement Input, Discount Rate | Valuation Technique, Discounted Cash Flow |  |  |  |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |  |  |  |
Discount rate, asset impairment analysis, cost of capital, theoretical market participant |  |  |  |  |  |  | 14.00% |  |
BridgeTex Pipeline Company, LLC (“BridgeTex”) |  |  |  |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |  |  |  |
Ownership interest in unconsolidated entity |  |  |  |  |  | 20.00% |  |  |
Investments in unconsolidated entities |  |  |  |  |  | $ 406 | $ 421 |  |
Cactus II Pipeline LLC (“Cactus II”) |  |  |  |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |  |  |  |
Ownership interest in unconsolidated entity |  |  |  |  |  | 65.00% |  |  |
Investments in unconsolidated entities |  |  |  |  |  | $ 737 | 752 |  |
Capline Pipeline Company LLC |  |  |  |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |  |  |  |
Ownership interest in unconsolidated entity |  |  |  |  |  | 54.00% |  |  |
Investments in unconsolidated entities |  |  |  |  |  | $ 531 | 514 |  |
Fair value of investment in unconsolidated entity |  |  |  |  | $ 444 |  |  |  |
Capline Pipeline Company LLC | Gain on/(impairment of) investments in unconsolidated entities, net |  |  |  |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |  |  |  |
Gain from remeasurement to fair value of retained investment |  |  |  |  |  |  |  | $ 269 |
Diamond Pipeline LLC (“Diamond”) |  |  |  |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |  |  |  |
Ownership interest in unconsolidated entity |  |  |  |  |  | 50.00% |  |  |
Investments in unconsolidated entities |  |  |  |  |  | $ 464 | 480 |  |
Eagle Ford Pipeline LLC (“Eagle Ford Pipeline”) |  |  |  |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |  |  |  |
Ownership interest in unconsolidated entity |  |  |  |  |  | 50.00% |  |  |
Investments in unconsolidated entities |  |  |  |  |  | $ 363 | 372 |  |
Eagle Ford Terminals Corpus Christi LLC (“Eagle Ford Terminals”) |  |  |  |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |  |  |  |
Ownership interest in unconsolidated entity |  |  |  |  |  | 50.00% |  |  |
Investments in unconsolidated entities |  |  |  |  |  | $ 120 | 122 |  |
OMOG JV LLC |  |  |  |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |  |  |  |
Ownership interest in unconsolidated entity |  |  |  |  |  | 40.00% |  |  |
Investments in unconsolidated entities |  |  |  |  |  | $ 102 |  |  |
Saddlehorn |  |  |  |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |  |  |  |
Ownership interest in unconsolidated entity | 30.00% |  |  |  |  | 30.00% |  |  |
Investments in unconsolidated entities |  |  |  |  |  | $ 209 | $ 208 |  |
Ownership percentage sold | 10.00% |  |  |  |  |  | 10.00% |  |
Proceeds from sale of interest in unconsolidated entity | $ 78 |  |  |  |  |  | $ 78 |  |
Saddlehorn | Gain on/(impairment of) investments in unconsolidated entities, net |  |  |  |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |  |  |  |
Gain on sale of investment in unconsolidated entities | $ 21 |  |  |  |  |  |  |  |
White Cliffs Pipeline, LLC |  |  |  |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |  |  |  |
Ownership interest in unconsolidated entity |  |  |  |  |  | 36.00% |  |  |
Investments in unconsolidated entities |  |  |  |  |  | $ 171 | 192 |  |
Wink to Webster Pipeline LLC (“W2W Pipeline”) |  |  |  |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |  |  |  |
Ownership interest in unconsolidated entity |  |  |  |  |  | 16.00% |  |  |
Investments in unconsolidated entities |  |  |  |  |  | $ 345 | 330 |  |
Other investments |  |  |  |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |  |  |  |
Investments in unconsolidated entities |  |  |  |  |  | $ 357 | $ 373 |  |
Write down of investments |  |  |  | $ 43 |  |  |  |  |
STACK Pipeline LLC (“STACK”) |  |  |  |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |  |  |  |
Write down of investments |  | $ 91 |  |  |  |  |  |  |
STACK Pipeline LLC (“STACK”) | Level 3 | Measurement Input, Discount Rate | Valuation Technique, Discounted Cash Flow |  |  |  |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |  |  |  |
Discount rate, asset impairment analysis, cost of capital, theoretical market participant |  | 14.00% |  |  |  |  |  |  |
Red Oak Pipeline LLC (“Red Oak”) |  |  |  |  |  |  |  |  |
Investments in Unconsolidated Entities |  |  |  |  |  |  |  |  |
Ownership interest in unconsolidated entity |  |  |  |  |  |  |  |  | 50.00%
Write down of investments |  |  | $ 69 |  |  |  |  |  |

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- Definition Cash outflow for capital contributions (excluding capitalized interest) subsequent to the initial purchase of interest in equity method investments, to fund the entity's portion of development, construction or capital expansion projects of the equity method investees, net of cash received as a return of investment. + References No definition available. + Details
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