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Partners' Capital and Distributions - Noncontrolling Interests in Subsidiaries (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Partners' Capital and Distributions |  |
Distributions | $ 185 | $ 311
Noncontrolling Interests |  |
Partners' Capital and Distributions |  |
Distributions | $ 150 | $ 245
AAP |  |
Partners' Capital and Distributions |  |
Noncontrolling interests in subsidiaries (percent) | 21.00% |
Red River LLC |  |
Partners' Capital and Distributions |  |
Noncontrolling interests in subsidiaries (percent) | 33.00% |
Common Units and Series A Preferred Units | PAA |  |
Partners' Capital and Distributions |  |
Noncontrolling interests in subsidiaries (percent) | 69.00% |
Series B Preferred Units | PAA |  |
Partners' Capital and Distributions |  |
Noncontrolling interests in subsidiaries (percent) | 100.00% |
Red River LLC | Noncontrolling Interests |  |
Partners' Capital and Distributions |  |
Distributions | $ 6 |

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