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Partners' Capital and Distributions - PAA Distributions (Details) - PAA - USD ($) $ / shares in Units, $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Feb. 12, 2021 | Jan. 07, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Partners Capital and Distribution [Line Items] |  |  |  |  |
Percentage of available cash distributed |  |  | 100.00% |  |
Number of days after end of quarter within which distributions must be paid to unitholders |  |  | 45 days |  |
Cash Distribution | Series A Preferred Units |  |  |  |  |
Partners Capital and Distribution [Line Items] |  |  |  |  |
Total distribution amount |  |  | $ 149 | $ 149 | $ 112
Cash Distribution | Series B Preferred Units |  |  |  |  |
Partners Capital and Distribution [Line Items] |  |  |  |  |
Total distribution amount |  |  | 49 | 49 | 49
Cash Distribution | Common Units |  |  |  |  |
Partners Capital and Distribution [Line Items] |  |  |  |  |
Distributions paid to limited partners |  |  | $ 655 | $ 1,004 | $ 871
Distributions per common unit (in dollars per share) |  |  | $ 0.90 | $ 1.38 | $ 1.20
Cash Distribution | Common Units | Subsequent Event |  |  |  |  |
Partners Capital and Distribution [Line Items] |  |  |  |  |
Distributions paid to limited partners | $ 130 |  |  |  |
Distributions per common unit (in dollars per share) |  | $ 0.18 |  |  |
Unit Distribution | Series A Preferred Units |  |  |  |  |
Partners Capital and Distribution [Line Items] |  |  |  |  |
Distribution made to limited partner, unit distributions paid (in units) |  |  | 0 | 0 | 1,393,926
Distributions paid to limited partners |  |  |  |  | $ 37
Public | Cash Distribution | Common Units |  |  |  |  |
Partners Capital and Distribution [Line Items] |  |  |  |  |
Distributions paid to limited partners |  |  | $ 432 | $ 632 | 532
AAP | Cash Distribution | Common Units |  |  |  |  |
Partners Capital and Distribution [Line Items] |  |  |  |  |
Distributions paid to limited partners |  |  | $ 223 | 372 | $ 339
AAP | Fourth quarter distribution | Cash Distribution | Common Units | Subsequent Event |  |  |  |  |
Partners Capital and Distribution [Line Items] |  |  |  |  |
Distributions paid to limited partners | 44 |  |  |  |
Other current liabilities | Series B Preferred Units |  |  |  |  |
Partners Capital and Distribution [Line Items] |  |  |  |  |
Distributions payable |  |  |  | $ 6 |
Other current liabilities | Cash Distribution | Series A Preferred Units | Subsequent Event |  |  |  |  |
Partners Capital and Distribution [Line Items] |  |  |  |  |
Distributions paid to limited partners | $ 37 |  |  |  |

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