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Derivatives and Risk Management Activities - Fair Value (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Level 3          
Rollforward of Level 3 Net Asset/(Liability)          
Beginning Balance $ (61) $ (10) $ (51) $ (24)  
Net gains/(losses) for the period included in earnings 18 (5) 8 18  
Settlements 1 (3) 1 (11)  
Derivatives entered into during the period   (8)   (9)  
Ending Balance (42) (26) (42) (26)  
Change in unrealized gains/(losses) included in earnings relating to Level 3 derivatives still held at the end of the period 18 $ (13) 8 $ 9  
Recurring Fair Value Measures          
Recurring Fair Value Measurements          
Total net derivative asset/(liability) 58   58   $ 53
Recurring Fair Value Measures | Commodity Derivatives          
Recurring Fair Value Measurements          
Total net derivative asset/(liability) 83   83   130
Recurring Fair Value Measures | Interest Rate Derivatives          
Recurring Fair Value Measurements          
Total net derivative asset/(liability) (5)   (5)   (44)
Recurring Fair Value Measures | Foreign Currency Derivatives          
Recurring Fair Value Measurements          
Total net derivative asset/(liability) (3)   (3)   1
Recurring Fair Value Measures | Preferred Distribution Rate Reset Option          
Recurring Fair Value Measurements          
Total net derivative asset/(liability) (17)   (17)   (34)
Recurring Fair Value Measures | Level 1          
Recurring Fair Value Measurements          
Total net derivative asset/(liability) 24   24   42
Recurring Fair Value Measures | Level 1 | Commodity Derivatives          
Recurring Fair Value Measurements          
Total net derivative asset/(liability) 24   24   42
Recurring Fair Value Measures | Level 2          
Recurring Fair Value Measurements          
Total net derivative asset/(liability) 76   76   62
Recurring Fair Value Measures | Level 2 | Commodity Derivatives          
Recurring Fair Value Measurements          
Total net derivative asset/(liability) 84   84   105
Recurring Fair Value Measures | Level 2 | Interest Rate Derivatives          
Recurring Fair Value Measurements          
Total net derivative asset/(liability) (5)   (5)   (44)
Recurring Fair Value Measures | Level 2 | Foreign Currency Derivatives          
Recurring Fair Value Measurements          
Total net derivative asset/(liability) (3)   (3)   1
Recurring Fair Value Measures | Level 3          
Recurring Fair Value Measurements          
Total net derivative asset/(liability) (42)   (42)   (51)
Recurring Fair Value Measures | Level 3 | Commodity Derivatives          
Recurring Fair Value Measurements          
Total net derivative asset/(liability) (25)   (25)   (17)
Recurring Fair Value Measures | Level 3 | Preferred Distribution Rate Reset Option          
Recurring Fair Value Measurements          
Total net derivative asset/(liability) $ (17)   $ (17)   $ (34)