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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)

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