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Capital Accounts, Issuances of Equity (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Net Cash Proceeds from Sale of Common Units [Abstract]    
Common units issued in connection with the vesting of phantom unit awards, net (in units) 4,051,207  
Buyback Program:    
Common units acquired in connection with buyback program   $ 14
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) 4,051,207  
2019 Buyback Program [Member]    
Buyback Program:    
Amount authorized under 2019 Buyback Program $ 2,000  
Remaining available capacity under the 2019 Buyback Program 1,500  
Total of common units repurchased under a buyback program (in units)   709,816
Common units acquired in connection with buyback program   $ 14
At-the-Market Registration [Member]    
Registration Statements and Equity Offerings [Line Items]    
Maximum common units authorized for issuance 2,500  
Remaining units available for issuance 2,500  
Employee Unit Purchase Plan [Member]    
Net Cash Proceeds from Sale of Common Units [Abstract]    
Employer contribution to EUPP $ 1  
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) 1,574,806