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Derivatives and Risk Management Activities - Fair Value (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Level 3          
Rollforward of Level 3 Net Asset/(Liability)          
Beginning Balance $ (92) $ (61) $ (29) $ (51)  
Net gains/(losses) for the period included in earnings 77 18 9 8  
Settlements 2 1 7 1  
Ending Balance (13) (42) (13) (42)  
Change in unrealized losses included in earnings relating to Level 3 derivatives still held at the end of the period 77 $ 18 9 $ 8  
Recurring Fair Value Measures          
Recurring Fair Value Measurements          
Total net derivative asset/(liability) (326)   (326)   $ (267)
Recurring Fair Value Measures | Commodity Derivatives          
Recurring Fair Value Measurements          
Total net derivative asset/(liability) (395)   (395)   (301)
Recurring Fair Value Measures | Interest Rate Derivatives          
Recurring Fair Value Measurements          
Total net derivative asset/(liability) 75   75   46
Recurring Fair Value Measures | Foreign Currency Derivatives          
Recurring Fair Value Measurements          
Total net derivative asset/(liability) (1)   (1)   2
Recurring Fair Value Measures | Preferred Distribution Rate Reset Option          
Recurring Fair Value Measurements          
Total net derivative asset/(liability) (5)   (5)   (14)
Recurring Fair Value Measures | Level 1          
Recurring Fair Value Measurements          
Total net derivative asset/(liability) (246)   (246)   (143)
Recurring Fair Value Measures | Level 1 | Commodity Derivatives          
Recurring Fair Value Measurements          
Total net derivative asset/(liability) (246)   (246)   (143)
Recurring Fair Value Measures | Level 1 | Interest Rate Derivatives          
Recurring Fair Value Measurements          
Total net derivative asset/(liability) 0   0   0
Recurring Fair Value Measures | Level 1 | Foreign Currency Derivatives          
Recurring Fair Value Measurements          
Total net derivative asset/(liability) 0   0   0
Recurring Fair Value Measures | Level 1 | Preferred Distribution Rate Reset Option          
Recurring Fair Value Measurements          
Total net derivative asset/(liability) 0   0   0
Recurring Fair Value Measures | Level 2          
Recurring Fair Value Measurements          
Total net derivative asset/(liability) (67)   (67)   (95)
Recurring Fair Value Measures | Level 2 | Commodity Derivatives          
Recurring Fair Value Measurements          
Total net derivative asset/(liability) (141)   (141)   (143)
Recurring Fair Value Measures | Level 2 | Interest Rate Derivatives          
Recurring Fair Value Measurements          
Total net derivative asset/(liability) 75   75   46
Recurring Fair Value Measures | Level 2 | Foreign Currency Derivatives          
Recurring Fair Value Measurements          
Total net derivative asset/(liability) (1)   (1)   2
Recurring Fair Value Measures | Level 2 | Preferred Distribution Rate Reset Option          
Recurring Fair Value Measurements          
Total net derivative asset/(liability) 0   0   0
Recurring Fair Value Measures | Level 3          
Recurring Fair Value Measurements          
Total net derivative asset/(liability) (13)   (13)   (29)
Recurring Fair Value Measures | Level 3 | Commodity Derivatives          
Recurring Fair Value Measurements          
Total net derivative asset/(liability) (8)   (8)   (15)
Recurring Fair Value Measures | Level 3 | Interest Rate Derivatives          
Recurring Fair Value Measurements          
Total net derivative asset/(liability) 0   0   0
Recurring Fair Value Measures | Level 3 | Foreign Currency Derivatives          
Recurring Fair Value Measurements          
Total net derivative asset/(liability) 0   0   0
Recurring Fair Value Measures | Level 3 | Preferred Distribution Rate Reset Option          
Recurring Fair Value Measurements          
Total net derivative asset/(liability) $ (5)   $ (5)   $ (14)