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Derivative Assets And Liabilities Table - Fair Value of Derivative Instruments (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Total derivatives assets $ 147 $ 384
Total derivatives liabilities (726) (788)
Not Designated as Hedging Instrument [Member]    
Total derivatives assets 115 360
Total derivatives liabilities (674) (788)
Fair Value, Recurring [Member]    
Price Risk Derivative Liabilities, at Fair Value 204 389
Level 1 | Fair Value, Recurring [Member]    
Price Risk Derivative Liabilities, at Fair Value 198 383
Level 2 | Fair Value, Recurring [Member]    
Price Risk Derivative Liabilities, at Fair Value 6 6
Commodity Derivatives [Member] | Not Designated as Hedging Instrument [Member]    
Total derivatives assets 47 41
Total derivatives liabilities (45) (39)
Commodity Derivatives (Margin Deposits) [Member] | Designated as Hedging Instrument [Member]    
Total derivatives assets 32 24
Total derivatives liabilities (52) 0
Commodity Derivatives (Margin Deposits) [Member] | Not Designated as Hedging Instrument [Member]    
Total derivatives assets 68 319
Total derivatives liabilities (107) (350)
Interest Rate Derivatives [Member] | Not Designated as Hedging Instrument [Member]    
Total derivatives assets 0 0
Total derivatives liabilities $ (522) $ (399)