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Derivative Assets And Liabilities (Fair Value Of Derivative Instruments) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Asset Derivatives $ 272 $ 168
Liability Derivatives (598) (717)
Designated as Hedging Instrument [Member]    
Asset Derivatives 46 25
Liability Derivatives (3) (32)
Not Designated as Hedging Instrument [Member]    
Asset Derivatives 226 143
Liability Derivatives (595) (685)
Broker cleared derivative contracts [Member]    
Asset Derivatives 219 115
Liability Derivatives (159) (198)
Commodity Derivatives [Member] | Not Designated as Hedging Instrument [Member]    
Asset Derivatives 53 53
Liability Derivatives (52) (71)
Commodity Derivatives (Margin Deposits) [Member] | Designated as Hedging Instrument [Member]    
Asset Derivatives 46 25
Liability Derivatives (3) (32)
Commodity Derivatives (Margin Deposits) [Member] | Not Designated as Hedging Instrument [Member]    
Asset Derivatives 173 90
Liability Derivatives (156) (166)
Interest Rate Derivatives [Member] | Not Designated as Hedging Instrument [Member]    
Asset Derivatives 0 0
Liability Derivatives $ (387) $ (448)