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Hedging Activities and Fair Value Measurements, Recurring Fair Value Measurements (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Financial assets [Abstract] |  |
Value before application of CME Rule 814 | $ 2,434 | $ 1,232
Impact of CME Rule 814 | (1,983) | (993)
Total commodity derivatives | 451 | 239
Total | 451 | 239
Commodity derivatives: |  |
Value before application of CME Rule 814 | 2,325 | 1,200
Impact of CME Rule 814 | (1,854) | (944)
Total commodity derivatives | 471 | 256
Total | 471 | 256
Net value before application of CME Rule 814 to commodity hedging portfolio | 109 |
Level 1 [Member] |  |
Financial assets [Abstract] |  |
Value before application of CME Rule 814 | 357 | 122
Impact of CME Rule 814 | (327) | (122)
Total commodity derivatives | 30 | 0
Total | 30 | 0
Commodity derivatives: |  |
Value before application of CME Rule 814 | 578 | 199
Impact of CME Rule 814 | (546) | (199)
Total commodity derivatives | 32 | 0
Total | 32 | 0
Level 2 [Member] |  |
Financial assets [Abstract] |  |
Value before application of CME Rule 814 | 2,076 | 1,110
Impact of CME Rule 814 | (1,656) | (871)
Total commodity derivatives | 420 | 239
Total | 420 | 239
Commodity derivatives: |  |
Value before application of CME Rule 814 | 1,746 | 1,001
Impact of CME Rule 814 | (1,308) | (745)
Total commodity derivatives | 438 | 256
Total | 438 | 256
Level 3 [Member] |  |
Financial assets [Abstract] |  |
Value before application of CME Rule 814 | 1 | 0
Impact of CME Rule 814 | 0 | 0
Total commodity derivatives | 1 | 0
Total | 1 | 0
Commodity derivatives: |  |
Value before application of CME Rule 814 | 1 | 0
Impact of CME Rule 814 | 0 | 0
Total commodity derivatives | 1 | 0
Total | $ 1 | $ 0

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