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Partners' Capital and Distributions - AAP Distributions (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Feb. 12, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
AAP | Cash Distribution |  |  |  |
Partners Capital and Distribution [Line Items] |  |  |  |
Distributions to noncontrolling interests |  | $ 57 | $ 141 | $ 150
Distributions to PAGP |  | 166 | 231 | 189
Distributions paid to limited partners |  | 223 | 372 | $ 339
Red River Pipeline Company LLC |  |  |  |
Partners Capital and Distribution [Line Items] |  |  |  |
Distributions to noncontrolling interests |  | $ 10 | $ 6 |
Fourth quarter distribution | AAP | Cash Distribution | Subsequent Event |  |  |  |
Partners Capital and Distribution [Line Items] |  |  |  |
Distributions to noncontrolling interests | $ 9 |  |  |
Distributions to PAGP | 35 |  |  |
Distributions paid to limited partners | $ 44 |  |  |

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