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Derivative Assets And Liabilities (Fair Value Of Derivative Instruments) (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Asset Derivatives $ 688 $ 272
Liability Derivatives (549) (598)
Designated as Hedging Instrument [Member]    
Asset Derivatives 87 46
Liability Derivatives (7) (3)
Not Designated as Hedging Instrument [Member]    
Asset Derivatives 601 226
Liability Derivatives (542) (595)
Broker cleared derivative contracts [Member]    
Asset Derivatives 593 219
Liability Derivatives (418) (159)
Commodity Derivatives [Member] | Not Designated as Hedging Instrument [Member]    
Asset Derivatives 95 53
Liability Derivatives (108) (52)
Commodity Derivatives (Margin Deposits) [Member] | Designated as Hedging Instrument [Member]    
Asset Derivatives 87 46
Liability Derivatives (7) (3)
Commodity Derivatives (Margin Deposits) [Member] | Not Designated as Hedging Instrument [Member]    
Asset Derivatives 506 173
Liability Derivatives (411) (156)
Interest Rate Derivatives [Member] | Not Designated as Hedging Instrument [Member]    
Asset Derivatives 0 0
Liability Derivatives $ (23) $ (387)