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Partners' Capital and Distributions - Noncontrolling Interest in Subsidiaries (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Noncontrolling Interest [Line Items] |  |  |  |
Contributions from noncontrolling interests | $ 2 |  | $ 10 |
Distributions from noncontrolling interests | 184 | $ 311 | 496 | $ 579
Noncontrolling Interests |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |
Contributions from noncontrolling interests | 2 |  | 10 |
Distributions from noncontrolling interests | $ 4 |  | 4 |
Red River LLC | Noncontrolling Interests |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |
Contributions from noncontrolling interests |  |  | 10 |
Distributions from noncontrolling interests |  |  | $ 4 |

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