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Capital Accounts - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Feb. 13, 2026
Mar. 27, 2024
Feb. 16, 2024
Sep. 30, 2020
Dec. 31, 2025
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Oct. 31, 2025
Dec. 31, 2022
Registration Statements and Equity Offerings [Line Items]                                          
Borrowings under debt agreements                                 $ 88,281 $ 53,715 $ 89,899    
Buyback Program:                                          
Stock repurchased and retired during period, (in units)                                 9,496,536 7,556,210 7,244,540    
Common units acquired in connection with buyback program                                 $ 300 $ 219 $ 188    
Proceeds from Issuance or Sale of Equity [Abstract]                                          
Common units issued in connection with the vesting of phantom unit awards, net (in units)                                 5,346,387 4,990,360 4,662,539    
Series A cumulative convertible preferred units outstanding (in units)       50,000 45,412       50,687       50,412       45,412 50,687 50,412   50,412
Temporary equity, par or stated value per share (in dollars per unit)       $ 1,000                                  
Preferred unit distribution rate                                 7.25%        
Total distributions paid to convertible preferred unitholders                                 $ 4 $ 4      
Series A cumulative convertible preferred units, paid-in kind distribution (in units)                                 291 275      
Cash distributions paid to convertible preferred unitholders                                 $ 3 $ 3 $ 3    
Redemption price per preferred unit on or after September 30, 2025 at unitholder election (in dollars per unit)                                 $ 1,000        
Percentage applied to the common unit market price in calculating the number of common units to be acquired upon the conversion of series A preferred units to common units                                 92.50%        
Redemption price per preferred unit from September 30, 2025 through September 29, 2026 (in dollars per unit)                                 $ 1,010        
Redemption price per preferred unit on or after September 30, 2026 (in dollars per unit)                                 1,000        
Redemption price per preferred unit if Change of Control event occurs (in dollars per unit)                                 $ 1,010        
Percentage of preferred units that may be converted into common units at unitholder option                                 50.00%        
Net income attributable to noncontrolling interests                                 $ 62 69 125    
Payments to noncontrolling interests     $ 375                           $ 0 400 10    
Number of days after quarter end to distribute available cash                                 45 days        
Quarterly distribution per common unit (in units)         $ 0.5500 $ 0.5450 $ 0.5450 $ 0.5350 $ 0.5350 $ 0.5250 $ 0.5250 $ 0.5150 $ 0.5150 $ 0.5000 $ 0.5000 $ 0.4900          
Annualized distribution per common unit (in dollars per unit)         $ 2.20                                
Cash payments made in connection with DERs                                 $ 44 43 38    
Senior Notes                                          
Registration Statements and Equity Offerings [Line Items]                                          
Borrowings under debt agreements                                 $ 3,650 $ 4,500 $ 1,750    
Subsequent Event                                          
Proceeds from Issuance or Sale of Equity [Abstract]                                          
Cash distributions paid $ 1,200                                        
Cash payments made in connection with DERs $ 11                                        
Whitethorn Pipeline Company LLC                                          
Proceeds from Issuance or Sale of Equity [Abstract]                                          
Equity interest acquired     20.00%                                    
Enterprise EF78 LLC                                          
Proceeds from Issuance or Sale of Equity [Abstract]                                          
Equity interest acquired     25.00%                                    
Panola Pipeline Company, LLC                                          
Proceeds from Issuance or Sale of Equity [Abstract]                                          
Equity interest acquired   15.00%                                      
Payments to noncontrolling interests   $ 25                                      
Subsidiary, ownership percentage, parent   70.00%                                      
Common Units                                          
Proceeds from Issuance or Sale of Equity [Abstract]                                          
Partners' equity account, units, treasury units purchased (in units)       54,807,352                                  
Preferred Units                                          
Proceeds from Issuance or Sale of Equity [Abstract]                                          
Treasury Stock, preferred, shares (in units)       855,915                                  
Phantom unit awards                                          
Proceeds from Issuance or Sale of Equity [Abstract]                                          
Common units issued in connection with the vesting of phantom unit awards, net (in units)                                 5,346,387 4,990,360 4,662,539    
Cash payments made in connection with DERs                                 $ 44 $ 43 $ 38    
2019 Buyback Program                                          
Buyback Program:                                          
Share repurchase program, authorized, amount           $ 2,000                           $ 5,000  
Stock repurchased and retired during period, (in units)                                 9,496,536 7,556,210 7,244,540    
Common units acquired in connection with buyback program                                 $ 300 $ 219 $ 188    
Share repurchase program, remaining authorized, amount         $ 3,600                       3,600        
At-the-Market Registration                                          
Registration Statements and Equity Offerings [Line Items]                                          
Maximum common units authorized for issuance         2,500                       2,500        
Limited partners capital account remaining units available for issuance in dollars         $ 2,500                       $ 2,500        
Employee Unit Purchase Plan                                          
Proceeds from Issuance or Sale of Equity [Abstract]                                          
Limited partners' capital account, units authorized (in units)         23,000,000                       23,000,000        
Employer contribution to EUPP                                 $ 4 $ 3 $ 3    
Limited partners capital account remaining units available for issuance (in units)         12,532,388                       12,532,388        
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)                                 4,684,726 6,538,068 6,560,588    
Distribution Reinvestment Plan                                          
Proceeds from Issuance or Sale of Equity [Abstract]                                          
Limited partners capital account remaining units available for issuance (in units)         25,862,040                       25,862,040