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Capital Accounts, Issuances of Equity (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Net Cash Proceeds from Sale of Common Units [Abstract]            
Common units issued in connection with the vesting of phantom unit awards, net (in units) 126,671 153,502 4,364,301      
Buyback Program:            
Total of common units repurchased under a buyback program (in units)   2,910,121 682,589      
Common units acquired in connection with buyback program       $ 72 $ 92 $ 107
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)         4,644,474  
2019 Buyback Program [Member]            
Buyback Program:            
Amount authorized under 2019 Buyback Program $ 2,000       $ 2,000  
Remaining available capacity under the 2019 Buyback Program 1,200       $ 1,200  
Total of common units repurchased under a buyback program (in units)       2,925,842 3,592,710 4,333,963
Common units acquired in connection with buyback program       $ 72 $ 92 $ 107
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)         4,986,549