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Derivative Assets And Liabilities Table - Fair Value of Derivative Instruments (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Total derivatives assets $ 373 $ 168
Total derivatives liabilities (765) (717)
Designated as Hedging Instrument [Member]    
Total derivatives assets 1 25
Total derivatives liabilities (3) (32)
Not Designated as Hedging Instrument [Member]    
Total derivatives assets 372 143
Total derivatives liabilities (762) (685)
Fair Value, Recurring [Member]    
Price Risk Derivative Liabilities, at Fair Value 387 269
Forward Physical Swaps [Member] | Fair Value, Recurring [Member] | Commodity Derivatives - Natural Gas [Member]    
Price Risk Derivative Liabilities, at Fair Value 1  
Level 1 | Fair Value, Recurring [Member]    
Price Risk Derivative Liabilities, at Fair Value 365 265
Level 1 | Forward Physical Swaps [Member] | Fair Value, Recurring [Member] | Commodity Derivatives - Natural Gas [Member]    
Price Risk Derivative Liabilities, at Fair Value 0  
Level 2 | Fair Value, Recurring [Member]    
Price Risk Derivative Liabilities, at Fair Value 22 4
Level 2 | Forward Physical Swaps [Member] | Fair Value, Recurring [Member] | Commodity Derivatives - Natural Gas [Member]    
Price Risk Derivative Liabilities, at Fair Value 1  
Commodity Derivatives [Member] | Not Designated as Hedging Instrument [Member]    
Total derivatives assets 183 53
Total derivatives liabilities (151) (71)
Commodity Derivatives (Margin Deposits) [Member] | Designated as Hedging Instrument [Member]    
Total derivatives assets 1 25
Total derivatives liabilities (3) (32)
Commodity Derivatives (Margin Deposits) [Member] | Not Designated as Hedging Instrument [Member]    
Total derivatives assets 189 90
Total derivatives liabilities (233) (166)
Interest Rate Derivatives [Member] | Not Designated as Hedging Instrument [Member]    
Total derivatives assets 0 0
Total derivatives liabilities $ (378) $ (448)