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Partners' Capital and Distributions - Common Equity Repurchase Program (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2021
Common Units |  |  |
Partners Capital and Distribution [Line Items] |  |  |
Repurchase and cancellation of common units under the Common Equity Repurchase Program (units) | 4,940,592 | 350,000 |
Common Equity Repurchase Program |  |  |
Partners Capital and Distribution [Line Items] |  |  |
Common equity repurchase program, repurchased amount (dollars) |  |  | $ 53
Common equity repurchase program, remaining amount | $ 397 |  | $ 397
Common Equity Repurchase Program | Common Units |  |  |
Partners Capital and Distribution [Line Items] |  |  |
Repurchase and cancellation of common units under the Common Equity Repurchase Program (units) |  |  | 5,290,592

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