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Derivative Assets And Liabilities Table - Fair Value of Derivative Instruments (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Total derivatives assets $ 541 $ 560
Total derivatives liabilities (877) (746)
Not Designated as Hedging Instrument [Member]    
Total derivatives assets 527 560
Total derivatives liabilities (877) (733)
Fair Value, Measurements, Recurring [Member]    
Price Risk Derivative Liabilities, at Fair Value 523 583
Forward Physical Swaps [Member] | Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Natural Gas [Member]    
Price Risk Derivative Liabilities, at Fair Value 3 21
Level 1 | Fair Value, Measurements, Recurring [Member]    
Price Risk Derivative Liabilities, at Fair Value 488 480
Level 1 | Forward Physical Swaps [Member] | Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Natural Gas [Member]    
Price Risk Derivative Liabilities, at Fair Value 0 0
Level 2 | Fair Value, Measurements, Recurring [Member]    
Price Risk Derivative Liabilities, at Fair Value 35 103
Level 2 | Forward Physical Swaps [Member] | Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Natural Gas [Member]    
Price Risk Derivative Liabilities, at Fair Value 3 21
Commodity Derivatives [Member] | Not Designated as Hedging Instrument [Member]    
Total derivatives assets 121 158
Total derivatives liabilities (85) (173)
Commodity Derivatives (Margin Deposits) [Member] | Designated as Hedging Instrument [Member]    
Total derivatives assets 14 0
Total derivatives liabilities 0 (13)
Commodity Derivatives (Margin Deposits) [Member] | Not Designated as Hedging Instrument [Member]    
Total derivatives assets 406 402
Total derivatives liabilities (438) (397)
Interest Rate Derivatives [Member] | Not Designated as Hedging Instrument [Member]    
Total derivatives assets 0 0
Total derivatives liabilities $ (354) $ (163)