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Derivative Instruments and Hedging Activities (Fair Value Of Derivatives Not Designated As Hedging Instruments) (Details) - Not Designated As Hedging Instrument [Member] - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Derivative [Line Items] |  |
FX Contracts Assets | $ 215 | $ 283
Embedded Derivative, Fair Value of Embedded Derivative Asset | 0 | 0
Commodity Contracts Assets | 2,274 | 2,764
Total fair value of derivative assets not designated as hedging instruments | 2,489 | 3,047
FX Contracts Liabilities | 165 | 270
Commodity Contracts Liabilities | 1,813 | 2,034
Embedded Derivative, Fair Value of Embedded Derivative Liability | 54 | 34
Total fair value of derivative liabilities not designated as hedging instruments. | $ 2,032 | $ 2,338

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