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Derivative Assets And Liabilities Table - Fair Value of Derivative Instruments (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Total derivatives assets $ 1,034 $ 168
Total derivatives liabilities (1,457) (717)
Designated as Hedging Instrument [Member]    
Total derivatives assets 2 25
Total derivatives liabilities (20) (32)
Not Designated as Hedging Instrument [Member]    
Total derivatives assets 1,032 143
Total derivatives liabilities (1,437) (685)
Fair Value, Recurring [Member]    
Price Risk Derivative Liabilities, at Fair Value 1,081 269
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 1,059 265
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 702 53
Total derivatives liabilities (661) (71)
Commodity Derivatives (Margin Deposits) [Member] | Designated as Hedging Instrument [Member]    
Total derivatives assets 2 25
Total derivatives liabilities (20) (32)
Commodity Derivatives (Margin Deposits) [Member] | Not Designated as Hedging Instrument [Member]    
Total derivatives assets 330 90
Total derivatives liabilities (400) (166)
Interest Rate Derivatives [Member] | Not Designated as Hedging Instrument [Member]    
Total derivatives assets 0 0
Total derivatives liabilities $ (376) $ (448)