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Derivatives and Risk Management Activities - Fair Value (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Level 3        
Rollforward of Level 3 Net Asset/(Liability)        
Beginning Balance $ (44) $ (189) $ (2)  
Net gains/(losses) for the period included in earnings (103) 58 (147)  
Settlements   131 2  
Ending Balance (147) 0 (147)  
Change in unrealized gains/(losses) included in earnings relating to Level 3 derivatives still held at the end of the period $ (103)   $ (147)  
Recurring Fair Value Measures        
Recurring Fair Value Measurements        
Total net derivative asset/(liability)   205   $ 153
Recurring Fair Value Measures | Commodity derivatives        
Recurring Fair Value Measurements        
Total net derivative asset/(liability)   163   222
Recurring Fair Value Measures | Interest rate derivatives        
Recurring Fair Value Measurements        
Total net derivative asset/(liability)   42   120
Recurring Fair Value Measures | Preferred Distribution Rate Reset Option        
Recurring Fair Value Measurements        
Total net derivative asset/(liability)       (189)
Recurring Fair Value Measures | Level 1        
Recurring Fair Value Measurements        
Total net derivative asset/(liability)   9   (7)
Recurring Fair Value Measures | Level 1 | Commodity derivatives        
Recurring Fair Value Measurements        
Total net derivative asset/(liability)   9   (7)
Recurring Fair Value Measures | Level 2        
Recurring Fair Value Measurements        
Total net derivative asset/(liability)   196   349
Recurring Fair Value Measures | Level 2 | Commodity derivatives        
Recurring Fair Value Measurements        
Total net derivative asset/(liability)   154   229
Recurring Fair Value Measures | Level 2 | Interest rate derivatives        
Recurring Fair Value Measurements        
Total net derivative asset/(liability)   42   120
Recurring Fair Value Measures | Level 3        
Recurring Fair Value Measurements        
Total net derivative asset/(liability)   $ 0   (189)
Recurring Fair Value Measures | Level 3 | Preferred Distribution Rate Reset Option        
Recurring Fair Value Measurements        
Total net derivative asset/(liability)       $ (189)