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Investments in Unconsolidated Entities Investments in Unconsolidated Entities (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Feb. 29, 2020 | Mar. 31, 2020 | Dec. 31, 2019
Investments in Unconsolidated Entities |  |  |
Investments in unconsolidated entities |  | $ 3,714 | $ 3,683
BridgeTex Pipeline Company, LLC |  |  |
Investments in Unconsolidated Entities |  |  |
Ownership interest in unconsolidated entity |  | 20.00% |
Investments in unconsolidated entities |  | $ 427 | 431
Cactus II Pipeline LLC |  |  |
Investments in Unconsolidated Entities |  |  |
Ownership interest in unconsolidated entity |  | 65.00% |
Investments in unconsolidated entities |  | $ 767 | 738
Capline Pipeline Company LLC |  |  |
Investments in Unconsolidated Entities |  |  |
Ownership interest in unconsolidated entity |  | 54.00% |
Investments in unconsolidated entities |  | $ 499 | 484
Diamond Pipeline LLC |  |  |
Investments in Unconsolidated Entities |  |  |
Ownership interest in unconsolidated entity |  | 50.00% |
Investments in unconsolidated entities |  | $ 477 | 476
Eagle Ford Pipeline LLC |  |  |
Investments in Unconsolidated Entities |  |  |
Ownership interest in unconsolidated entity |  | 50.00% |
Investments in unconsolidated entities |  | $ 391 | 382
Eagle Ford Terminals Corpus Christi LLC |  |  |
Investments in Unconsolidated Entities |  |  |
Ownership interest in unconsolidated entity |  | 50.00% |
Investments in unconsolidated entities |  | $ 128 | 126
Red Oak Pipeline LLC |  |  |
Investments in Unconsolidated Entities |  |  |
Ownership interest in unconsolidated entity |  | 50.00% |
Investments in unconsolidated entities |  | $ 54 | 20
Saddlehorn Pipeline Company, LLC |  |  |
Investments in Unconsolidated Entities |  |  |
Ownership interest in unconsolidated entity | 30.00% | 30.00% |
Investments in unconsolidated entities |  | $ 181 | 234
Ownership percentage sold | 10.00% |  |
Proceeds from sale of interest in unconsolidated entity | $ 78 |  |
STACK Pipeline LLC |  |  |
Investments in Unconsolidated Entities |  |  |
Ownership interest in unconsolidated entity |  | 50.00% |
Investments in unconsolidated entities |  | $ 116 | 117
White Cliffs Pipeline, LLC |  |  |
Investments in Unconsolidated Entities |  |  |
Ownership interest in unconsolidated entity |  | 36.00% |
Investments in unconsolidated entities |  | $ 193 | 196
Wink to Webster Pipeline LLC |  |  |
Investments in Unconsolidated Entities |  |  |
Ownership interest in unconsolidated entity |  | 16.00% |
Investments in unconsolidated entities |  | $ 182 | 136
Other investments |  |  |
Investments in Unconsolidated Entities |  |  |
Investments in unconsolidated entities |  | 299 | $ 343
Gain on/(impairment of) investments in unconsolidated entities, net [Member] | Saddlehorn Pipeline Company, LLC |  |  |
Investments in Unconsolidated Entities |  |  |
Gain on sale of investment in unconsolidated entity | $ 21 |  |
Gain on/(impairment of) investments in unconsolidated entities, net [Member] | Other investments |  |  |
Investments in Unconsolidated Entities |  |  |
Write down of investments |  | $ 43 |

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