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Partners' Capital and Distributions - Common Equity Repurchase Program (Details) - Common Equity Repurchase Program - USD ($) shares in Millions, $ in Millions | 6 Months Ended
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Jun. 30, 2022 | Jun. 30, 2021
Partners Capital and Distribution [Line Items] |  |
Common equity repurchase program, remaining amount | $ 198 |
PAA |  |
Partners Capital and Distribution [Line Items] |  |
Common equity repurchase program, repurchased amount | $ 74 | $ 53
PAA | Common Units |  |
Partners Capital and Distribution [Line Items] |  |
Repurchase and cancellation of common units by a subsidiary under the Common Equity Repurchase Program (units) | 7.3 | 5.3

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