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Derivative Assets And Liabilities Table - Fair Value of Derivative Instruments (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Total derivatives assets $ 338 $ 560
Total derivatives liabilities (541) (746)
Not Designated as Hedging Instrument [Member]    
Total derivatives assets 336 560
Total derivatives liabilities (540) (733)
Fair Value, Measurements, Recurring [Member]    
Price Risk Derivative Liabilities, at Fair Value 309 583
Forward Physical Swaps [Member] | Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Natural Gas [Member]    
Price Risk Derivative Liabilities, at Fair Value 5 21
Level 1 | Fair Value, Measurements, Recurring [Member]    
Price Risk Derivative Liabilities, at Fair Value 267 480
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 42 103
Level 2 | Forward Physical Swaps [Member] | Fair Value, Measurements, Recurring [Member] | Commodity Derivatives - Natural Gas [Member]    
Price Risk Derivative Liabilities, at Fair Value 5 21
Commodity Derivatives [Member] | Not Designated as Hedging Instrument [Member]    
Total derivatives assets 127 158
Total derivatives liabilities (60) (173)
Commodity Derivatives (Margin Deposits) [Member] | Designated as Hedging Instrument [Member]    
Total derivatives assets 2 0
Total derivatives liabilities (1) (13)
Commodity Derivatives (Margin Deposits) [Member] | Not Designated as Hedging Instrument [Member]    
Total derivatives assets 209 402
Total derivatives liabilities (248) (397)
Interest Rate Derivatives [Member] | Not Designated as Hedging Instrument [Member]    
Total derivatives assets 0 0
Total derivatives liabilities $ (232) $ (163)