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Partners' Capital and Distributions - Subsidiary Cash Distributions (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended
--- | ---
Sep. 30, 2026 | Jun. 30, 2026 | Mar. 31, 2026
Class B Shares |  |  |
Partners' Capital and Distributions [Line Items] |  |  |
Amount accrued to distributions payable |  | $ 8 |
Cash Distribution | Series A Preferred Units | PAA |  |  |
Partners' Capital and Distributions [Line Items] |  |  |
Cash Distribution |  | $ 36 | $ 36
Distribution per unit (usd per share) |  | $ 0.615 | $ 0.615
Cash Distribution | Series A Preferred Units | PAA | Subsequent Event |  |  |
Partners' Capital and Distributions [Line Items] |  |  |
Cash Distribution | $ 36 |  |
Distribution per unit (usd per share) | $ 0.615 |  |
Cash Distribution | Class B Shares | PAA |  |  |
Partners' Capital and Distributions [Line Items] |  |  |
Cash Distribution |  | $ 16 | $ 17
Distribution per unit (usd per share) |  | $ 19.84 | $ 21.02
Cash Distribution | Class B Shares | PAA | Subsequent Event |  |  |
Partners' Capital and Distributions [Line Items] |  |  |
Cash Distribution | $ 16 |  |
Distribution per unit (usd per share) | $ 20.50 |  |

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