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Hedging Activities and Fair Value Measurements, Recurring Fair Value Measurements (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Financial assets [Abstract] |  |
Value before application of CME Rule 814 | $ 798 | $ 728
Impact of CME Rule 814 | (223) | (278)
Total commodity derivatives | 575 | 450
Total | 575 | 450
Financial liabilities [Abstract] |  |
Interest rate derivatives |  | 31
Commodity derivatives: |  |
Value before application of CME Rule 814 | 716 | 625
Impact of CME Rule 814 | (221) | (154)
Total commodity derivatives | 495 | 471
Total | 495 | 502
Net value before application of CME Rule 814 to commodity hedging portfolio | 82 |
Level 1 [Member] |  |
Financial assets [Abstract] |  |
Value before application of CME Rule 814 | 355 | 431
Impact of CME Rule 814 | (56) | (147)
Total commodity derivatives | 299 | 284
Total | 299 | 284
Financial liabilities [Abstract] |  |
Interest rate derivatives |  | 0
Commodity derivatives: |  |
Value before application of CME Rule 814 | 291 | 317
Impact of CME Rule 814 | (43) | (22)
Total commodity derivatives | 248 | 295
Total | 248 | 295
Level 2 [Member] |  |
Financial assets [Abstract] |  |
Value before application of CME Rule 814 | 443 | 297
Impact of CME Rule 814 | (167) | (131)
Total commodity derivatives | 276 | 166
Total | 276 | 166
Financial liabilities [Abstract] |  |
Interest rate derivatives |  | 31
Commodity derivatives: |  |
Value before application of CME Rule 814 | 404 | 308
Impact of CME Rule 814 | (157) | (132)
Total commodity derivatives | 247 | 176
Total | 247 | 207
Level 3 [Member] |  |
Financial assets [Abstract] |  |
Value before application of CME Rule 814 | 0 | 0
Impact of CME Rule 814 | 0 | 0
Total commodity derivatives | 0 | 0
Total | 0 | 0
Financial liabilities [Abstract] |  |
Interest rate derivatives |  | 0
Commodity derivatives: |  |
Value before application of CME Rule 814 | 21 | 0
Impact of CME Rule 814 | (21) | 0
Total commodity derivatives | 0 | 0
Total | $ 0 | $ 0

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