v3.26.3
Capital Accounts - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Nov. 13, 2026
Sep. 30, 2026
Jun. 30, 2026
Mar. 31, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Oct. 31, 2025
Jan. 31, 2019
Buyback Program:                    
Total of common units repurchased and retired under a buyback program (in units)   2,922,742 4,166,738 3,124,192            
Cost of common units repurchased under 2019 buyback program   $ 112     $ 80 $ 387 $ 250      
Proceeds from Issuance or Sale of Equity [Abstract]                    
Common units issued in connection with the vesting of phantom unit awards, net (in units)   50,431 125,636 4,866,420            
Series A cumulative convertible preferred units outstanding (in units)   45,412       45,412   45,412    
Cash distributions paid to convertible preferred unitholders           $ 3        
Distribution per common unit (in dollars per unit)   $ 0.56                
Annualized distribution per common unit (in dollars per unit)   $ 2.24                
Cash payments made in connection with DERs           $ 35 $ 33      
Forecast                    
Proceeds from Issuance or Sale of Equity [Abstract]                    
Cash distributions paid $ 1,200                  
Cash payments made in connection with DERs $ 12                  
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)           5,042,487        
2019 Buyback Program                    
Buyback Program:                    
Amount authorized under 2019 Buyback Program                 $ 5,000 $ 2,000
Total of common units repurchased and retired under a buyback program (in units)   2,922,742     2,543,004 10,213,672 7,913,198      
Cost of common units repurchased under 2019 buyback program   $ 112     $ 80 $ 387 $ 250      
Remaining available capacity under the 2019 Buyback Program   3,200       3,200        
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)           2,946,971        
Employee Unit Purchase Plan                    
Proceeds from Issuance or Sale of Equity [Abstract]                    
Employer contribution to EUPP           $ 3