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Derivatives and Risk Management Activities - Fair Value (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
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 12 10
Settlements 10 (11)
Derivatives entered into during the period 0 (26)
Ending Balance (29) (51)
Change in unrealized gains/(losses) included in earnings relating to Level 3 derivatives still held at the end of the period 12 (16)
Recurring Fair Value Measures    
Recurring Fair Value Measurements    
Total net derivative asset/(liability) (267) 53
Recurring Fair Value Measures | Commodity Derivatives    
Recurring Fair Value Measurements    
Total net derivative asset/(liability) (301) 130
Recurring Fair Value Measures | Interest Rate Derivatives    
Recurring Fair Value Measurements    
Total net derivative asset/(liability) 46 (44)
Recurring Fair Value Measures | Foreign Currency Derivatives    
Recurring Fair Value Measurements    
Total net derivative asset/(liability) 2 1
Recurring Fair Value Measures | Preferred Distribution Rate Reset Option    
Recurring Fair Value Measurements    
Total net derivative asset/(liability) (14) (34)
Recurring Fair Value Measures | Level 1    
Recurring Fair Value Measurements    
Total net derivative asset/(liability) (143) 42
Recurring Fair Value Measures | Level 1 | Commodity Derivatives    
Recurring Fair Value Measurements    
Total net derivative asset/(liability) (143) 42
Recurring Fair Value Measures | Level 1 | Interest Rate Derivatives    
Recurring Fair Value Measurements    
Total net derivative asset/(liability) 0 0
Recurring Fair Value Measures | Level 1 | Foreign Currency Derivatives    
Recurring Fair Value Measurements    
Total net derivative asset/(liability) 0 0
Recurring Fair Value Measures | Level 1 | Preferred Distribution Rate Reset Option    
Recurring Fair Value Measurements    
Total net derivative asset/(liability) 0 0
Recurring Fair Value Measures | Level 2    
Recurring Fair Value Measurements    
Total net derivative asset/(liability) (95) 62
Recurring Fair Value Measures | Level 2 | Commodity Derivatives    
Recurring Fair Value Measurements    
Total net derivative asset/(liability) (143) 105
Recurring Fair Value Measures | Level 2 | Interest Rate Derivatives    
Recurring Fair Value Measurements    
Total net derivative asset/(liability) 46 (44)
Recurring Fair Value Measures | Level 2 | Foreign Currency Derivatives    
Recurring Fair Value Measurements    
Total net derivative asset/(liability) 2 1
Recurring Fair Value Measures | Level 2 | Preferred Distribution Rate Reset Option    
Recurring Fair Value Measurements    
Total net derivative asset/(liability) 0 0
Recurring Fair Value Measures | Level 3    
Recurring Fair Value Measurements    
Total net derivative asset/(liability) (29) (51)
Recurring Fair Value Measures | Level 3 | Commodity Derivatives    
Recurring Fair Value Measurements    
Total net derivative asset/(liability) (15) (17)
Recurring Fair Value Measures | Level 3 | Interest Rate Derivatives    
Recurring Fair Value Measurements    
Total net derivative asset/(liability) 0 0
Recurring Fair Value Measures | Level 3 | Foreign Currency Derivatives    
Recurring Fair Value Measurements    
Total net derivative asset/(liability) 0 0
Recurring Fair Value Measures | Level 3 | Preferred Distribution Rate Reset Option    
Recurring Fair Value Measurements    
Total net derivative asset/(liability) $ (14) $ (34)