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Capital Accounts, Issuances of Equity (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Aug. 31, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Net Cash Proceeds from Sale of Common Units [Abstract] |  |  |  |  |  |
Common units issued in connection with the vesting of phantom unit awards, net (in units) |  | 162,867 | 4,679,377 |  |  |
Buyback Program: |  |  |  |  |  |
Total of common units repurchased under a buyback program (in units) |  | 1,419,581 | 1,386,835 |  |  |
Common units acquired in connection with buyback program |  | $ 40 |  | $ 75 | $ 80 | $ 92
Long-Term Incentive Plan (2008) [Member] |  |  |  |  |  |
Net Cash Proceeds from Sale of Common Units [Abstract] |  |  |  |  |  |
Common units issued in connection with the vesting of phantom unit awards, net (in units) |  |  |  |  | 4,842,244 |
Senior Notes [Member] | Subsequent Event [Member] |  |  |  |  |  |
Registration Statements and Equity Offerings [Line Items] |  |  |  |  |  |
Debt issued under universal shelf registration | $ 2,500 |  |  |  |  |
2019 Buyback Program [Member] |  |  |  |  |  |
Buyback Program: |  |  |  |  |  |
Amount authorized under 2019 Buyback Program |  | 2,000 |  |  | $ 2,000 |
Remaining available capacity under the 2019 Buyback Program |  | $ 1,000 |  |  | $ 1,000 |
Total of common units repurchased under a buyback program (in units) |  | 1,419,581 |  | 2,910,121 | 2,806,416 | 3,592,710
Common units acquired in connection with buyback program |  | $ 40 |  | $ 75 | $ 80 | $ 92
At-the-Market Registration [Member] |  |  |  |  |  |
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 |
Employee Unit Purchase Plan [Member] |  |  |  |  |  |
Net Cash Proceeds from Sale of Common Units [Abstract] |  |  |  |  |  |
Employer contribution to EUPP |  |  |  |  | $ 2 |
Distribution Reinvestment and Employee Unit Purchase Plans [Member] |  |  |  |  |  |
Net Cash Proceeds from Sale of Common Units [Abstract] |  |  |  |  |  |
Number of common units purchased on the open market and delivered to participants (in units) |  |  |  |  | 3,364,678 |

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