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Partners' Capital and Distributions - Distributions (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | --- | ---
Nov. 13, 2020 | Aug. 14, 2020 | May 15, 2020 | Feb. 14, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Partners Capital and Distribution [Line Items] |  |  |  |  |  |  |  |
Total distributions paid |  |  |  |  | $ 182 | $ 315 | $ 679 | $ 894
Common Units | Cash Distribution |  |  |  |  |  |  |  |
Partners Capital and Distribution [Line Items] |  |  |  |  |  |  |  |
Total distributions paid |  | $ 131 | $ 131 | $ 262 |  |  |  |
Distributions per common unit, paid (usd per unit) |  | $ 0.18 | $ 0.18 | $ 0.36 |  |  |  |
Common Units | Forecast | Cash Distribution |  |  |  |  |  |  |  |
Partners Capital and Distribution [Line Items] |  |  |  |  |  |  |  |
Total distributions paid | $ 131 |  |  |  |  |  |  |
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 | $ 172 |  |  |  |
Public | Common Units | Forecast | Cash Distribution |  |  |  |  |  |  |  |
Partners Capital and Distribution [Line Items] |  |  |  |  |  |  |  |
Distributions to common unitholders | $ 87 |  |  |  |  |  |  |
AAP | Common Units | Cash Distribution |  |  |  |  |  |  |  |
Partners Capital and Distribution [Line Items] |  |  |  |  |  |  |  |
Distributions to common unitholders |  | $ 45 | $ 45 | $ 90 |  |  |  |
AAP | Common Units | Forecast | Cash Distribution |  |  |  |  |  |  |  |
Partners Capital and Distribution [Line Items] |  |  |  |  |  |  |  |
Distributions to common unitholders | $ 44 |  |  |  |  |  |  |

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