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Derivative Assets And Liabilities Table - Fair Value of Derivative Instruments (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Total derivatives assets $ 419 $ 321
Total derivatives liabilities (931) (560)
Designated as Hedging Instrument [Member] | Commodity Derivatives (Margin Deposits) [Member]    
Total derivatives assets 0 14
Total derivatives liabilities (2) (2)
Not Designated as Hedging Instrument [Member]    
Total derivatives assets 419 307
Total derivatives liabilities (929) (558)
Not Designated as Hedging Instrument [Member] | Commodity Derivatives (Margin Deposits) [Member]    
Total derivatives assets 307 262
Total derivatives liabilities (352) (281)
Not Designated as Hedging Instrument [Member] | Commodity Derivatives [Member]    
Total derivatives assets 112 45
Total derivatives liabilities (430) (58)
Not Designated as Hedging Instrument [Member] | Interest Rate Derivatives [Member]    
Total derivatives assets 0 0
Total derivatives liabilities (147) (219)
Fair Value, Measurements, Recurring [Member]    
Price Risk Derivative Liabilities, at Fair Value 784 341
Forward Physical Swaps [Member] | Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Natural Gas [Member]    
Price Risk Derivative Liabilities, at Fair Value 5 (2)
Level 1 | Fair Value, Measurements, Recurring [Member]    
Price Risk Derivative Liabilities, at Fair Value 721 303
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 63 38
Level 2 | Forward Physical Swaps [Member] | Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Natural Gas [Member]    
Price Risk Derivative Liabilities, at Fair Value $ (5) $ (2)