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Partners' Capital and Distributions - Distributions (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | ---
Aug. 13, 2021 | May 14, 2021 | Feb. 12, 2021 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Partners Capital and Distribution [Line Items] |  |  |  |  |  |  |
Total distributions paid |  |  |  | $ 179 | $ 184 | $ 365 | $ 496
Common Units | Cash Distribution |  |  |  |  |  |  |
Partners Capital and Distribution [Line Items] |  |  |  |  |  |  |
Total distributions paid |  | $ 130 | $ 130 |  |  |  |
Distributions per common unit, paid (usd per unit) |  | $ 0.18 | $ 0.18 |  |  |  |
Common Units | Forecast | Cash Distribution |  |  |  |  |  |  |
Partners Capital and Distribution [Line Items] |  |  |  |  |  |  |
Total distributions paid | $ 129 |  |  |  |  |  |
Distributions per common unit, paid (usd per unit) | $ 0.18 |  |  |  |  |  |
Public | Common Units | Cash Distribution |  |  |  |  |  |  |
Partners Capital and Distribution [Line Items] |  |  |  |  |  |  |
Distributions to common unitholders |  | $ 86 | $ 86 |  |  |  |
Public | Common Units | Forecast | Cash Distribution |  |  |  |  |  |  |
Partners Capital and Distribution [Line Items] |  |  |  |  |  |  |
Distributions to common unitholders | $ 85 |  |  |  |  |  |
AAP | Common Units | Cash Distribution |  |  |  |  |  |  |
Partners Capital and Distribution [Line Items] |  |  |  |  |  |  |
Distributions to common unitholders |  | $ 44 | $ 44 |  |  |  |
AAP | Common Units | Forecast | Cash Distribution |  |  |  |  |  |  |
Partners Capital and Distribution [Line Items] |  |  |  |  |  |  |
Distributions to common unitholders | $ 44 |  |  |  |  |  |

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