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Capital Accounts, Issuances of Equity (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Buyback Program: |  |  |
Common units acquired in connection with buyback program | $ 188 | $ 250 | $ 214
Phantom Unit Awards [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) | 4,662,539 | 4,571,333 | 3,936,437
2019 Buyback Program [Member] |  |  |
Buyback Program: |  |  |
Total of common units repurchased under a buyback program (in units) | 7,244,540 | 10,166,923 | 9,891,956
Common units acquired in connection with buyback program | $ 188 | $ 250 | $ 214
Amount authorized under 2019 Buyback Program | 2,000 |  |
Remaining available capacity under the 2019 Buyback Program | 1,100 |  |
At-the-Market Registration [Member] |  |  |
Registration Statements and Equity Offerings [Line Items] |  |  |
Maximum common units authorized for issuance | 2,500 |  |
Net Cash Proceeds from Sale of Common Units [Abstract] |  |  |
Remaining units available for issuance | $ 2,500 |  |
Distribution Reinvestment Plan [Member] |  |  |
Net Cash Proceeds from Sale of Common Units [Abstract] |  |  |
Remaining units available for issuance (in units) | 34,589,287 |  |
Employee Unit Purchase Plan [Member] |  |  |
Registration Statements and Equity Offerings [Line Items] |  |  |
Maximum common units authorized for issuance (in units) | 23,000,000 |  |
Net Cash Proceeds from Sale of Common Units [Abstract] |  |  |
Employer contribution to EUPP | $ 3 | $ 3 | $ 3
Remaining units available for issuance (in units) | 15,027,935 |  |
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) | 6,560,588 | 6,392,846 | 6,363,197

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