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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 | Dec. 31, 2020 | Dec. 31, 2019
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Derivative [Line Items] |  |
FX Contracts Assets | $ 283 | $ 125
Commodity Contracts Assets | 2,764 | 478
Total fair value of derivative assets not designated as hedging instruments | 3,047 | 603
FX Contracts Liabilities | 270 | 120
Commodity Contracts Liabilities | 2,034 | 574
Embedded Derivative, Fair Value of Embedded Derivative Liability | 34 | 0
Embedded Derivative, Fair Value of Embedded Derivative Asset | 0 | 0
Total fair value of derivative liabilities not designated as hedging instruments. | $ 2,338 | $ 694

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