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Capital Accounts - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Nov. 14, 2025 | Sep. 30, 2025 | Jun. 30, 2025 | Mar. 31, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Oct. 31, 2025
Buyback Program: |  |  |  |  |  |  |  |
Total of common units repurchased and retired under a buyback program (in units) |  | 2,543,004 | 3,566,979 | 1,803,215 |  |  |  |
Cost of common units repurchased under 2019 buyback program |  | $ 80 |  |  | $ 76 | $ 250 | $ 156 |
Proceeds from Issuance or Sale of Equity [Abstract] |  |  |  |  |  |  |  |
Common units issued in connection with the vesting of phantom unit awards, net (in units) |  | 113,097 | 220,829 | 4,989,490 |  |  |  |
Cash distributions paid to convertible preferred unitholders |  |  |  |  |  | $ 2 |  |
Paid in-kind distribution to third party (in units) |  | 99 | 97 | 95 |  | 291 |  |
Paid -in-kind unit issued value (less than) |  |  |  |  |  | $ 1 |  |
Distribution per common unit (in dollars per unit) |  | $ 0.545 |  |  |  |  |  |
Annualized distribution per common unit (in dollars per unit) |  | $ 2.18 |  |  |  |  |  |
Cash payments made in connection with DERs |  |  |  |  |  | $ 33 | $ 32 |
Forecast |  |  |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity [Abstract] |  |  |  |  |  |  |  |
Cash distributions paid | $ 1,190 |  |  |  |  |  |  |
Cash payments made in connection with DERs | $ 11 |  |  |  |  |  |  |
Long-Term Incentive Plan (2008) |  |  |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity [Abstract] |  |  |  |  |  |  |  |
Common units issued in connection with the vesting of phantom unit awards, net (in units) |  |  |  |  |  | 5,323,416 |  |
2019 Buyback Program |  |  |  |  |  |  |  |
Buyback Program: |  |  |  |  |  |  |  |
Amount authorized under 2019 Buyback Program |  | $ 2,000 |  |  |  | $ 2,000 |  |
Total of common units repurchased and retired under a buyback program (in units) |  | 2,543,004 |  |  | 2,646,351 | 7,913,198 | 5,452,767 |
Cost of common units repurchased under 2019 buyback program |  | $ 80 |  |  | $ 76 | $ 250 | $ 156 |
Remaining available capacity under the 2019 Buyback Program |  | 613 |  |  |  | 613 |  |
2019 Buyback Program | Subsequent Event |  |  |  |  |  |  |  |
Buyback Program: |  |  |  |  |  |  |  |
Amount authorized under 2019 Buyback Program |  |  |  |  |  |  |  | $ 5,000
Remaining available capacity under the 2019 Buyback Program |  |  |  |  |  |  |  | $ 3,600
At-the-Market Registration |  |  |  |  |  |  |  |
Registration Statements and Equity Offerings [Line Items] |  |  |  |  |  |  |  |
Maximum common units authorized for issuance |  | 2,500 |  |  |  | 2,500 |  |
Remaining units available for issuance |  | $ 2,500 |  |  |  | $ 2,500 |  |
Distribution Reinvestment and Employee Unit Purchase Plans |  |  |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity [Abstract] |  |  |  |  |  |  |  |
Number of common units purchased on the open market and delivered to participants (in units) |  |  |  |  |  | 3,529,782 |  |
Employee Unit Purchase Plan |  |  |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity [Abstract] |  |  |  |  |  |  |  |
Employer contribution to EUPP |  |  |  |  |  | $ 3 |  |

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