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Derivatives and Risk Management Activities - Fair Value (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Level 3      
Rollforward of Level 3 Net Asset/(Liability)      
Beginning Balance $ (51) $ (24)  
Net gains/(losses) for the period included in earnings (10) 23  
Settlements   (10)  
Derivatives entered into during the period   1  
Ending Balance (61) (10)  
Change in unrealized gains/(losses) included in earnings relating to Level 3 derivatives still held at the end of the period (10) $ 24  
Recurring Fair Value Measures      
Recurring Fair Value Measurements      
Total net derivative asset/(liability) 115   $ 53
Recurring Fair Value Measures | Commodity Derivatives      
Recurring Fair Value Measurements      
Total net derivative asset/(liability) 252   130
Recurring Fair Value Measures | Interest Rate Derivatives      
Recurring Fair Value Measurements      
Total net derivative asset/(liability) (124)   (44)
Recurring Fair Value Measures | Foreign Currency Derivatives      
Recurring Fair Value Measurements      
Total net derivative asset/(liability) (5)   1
Recurring Fair Value Measures | Preferred Distribution Rate Reset Option      
Recurring Fair Value Measurements      
Total net derivative asset/(liability) (8)   (34)
Recurring Fair Value Measures | Level 1      
Recurring Fair Value Measurements      
Total net derivative asset/(liability) 177   42
Recurring Fair Value Measures | Level 1 | Commodity Derivatives      
Recurring Fair Value Measurements      
Total net derivative asset/(liability) 177   42
Recurring Fair Value Measures | Level 2      
Recurring Fair Value Measurements      
Total net derivative asset/(liability) (1)   62
Recurring Fair Value Measures | Level 2 | Commodity Derivatives      
Recurring Fair Value Measurements      
Total net derivative asset/(liability) 128   105
Recurring Fair Value Measures | Level 2 | Interest Rate Derivatives      
Recurring Fair Value Measurements      
Total net derivative asset/(liability) (124)   (44)
Recurring Fair Value Measures | Level 2 | Foreign Currency Derivatives      
Recurring Fair Value Measurements      
Total net derivative asset/(liability) (5)   1
Recurring Fair Value Measures | Level 3      
Recurring Fair Value Measurements      
Total net derivative asset/(liability) (61)   (51)
Recurring Fair Value Measures | Level 3 | Commodity Derivatives      
Recurring Fair Value Measurements      
Total net derivative asset/(liability) (53)   (17)
Recurring Fair Value Measures | Level 3 | Preferred Distribution Rate Reset Option      
Recurring Fair Value Measurements      
Total net derivative asset/(liability) $ (8)   $ (34)