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Hedging Activities and Fair Value Measurements, Recurring Fair Value Measurements (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Financial assets [Abstract] |  |
Value before application of CME Rule 814 | $ 1,106 | $ 728
Impact of CME Rule 814 | (318) | (278)
Total commodity derivatives | 788 | 450
Total | 788 | 450
Financial liabilities [Abstract] |  |
Interest rate derivatives |  | 31
Commodity derivatives: |  |
Value before application of CME Rule 814 | 968 | 625
Impact of CME Rule 814 | (192) | (154)
Total commodity derivatives | 776 | 471
Total | 776 | 502
Net value before application of CME Rule 814 to commodity hedging portfolio | 138 |
Level 1 [Member] |  |
Financial assets [Abstract] |  |
Value before application of CME Rule 814 | 761 | 431
Impact of CME Rule 814 | (151) | (147)
Total commodity derivatives | 610 | 284
Total | 610 | 284
Financial liabilities [Abstract] |  |
Interest rate derivatives |  | 0
Commodity derivatives: |  |
Value before application of CME Rule 814 | 603 | 317
Impact of CME Rule 814 | (29) | (22)
Total commodity derivatives | 574 | 295
Total | 574 | 295
Level 2 [Member] |  |
Financial assets [Abstract] |  |
Value before application of CME Rule 814 | 344 | 297
Impact of CME Rule 814 | (166) | (131)
Total commodity derivatives | 178 | 166
Total | 178 | 166
Financial liabilities [Abstract] |  |
Interest rate derivatives |  | 31
Commodity derivatives: |  |
Value before application of CME Rule 814 | 351 | 308
Impact of CME Rule 814 | (149) | (132)
Total commodity derivatives | 202 | 176
Total | 202 | 207
Level 3 [Member] |  |
Financial assets [Abstract] |  |
Value before application of CME Rule 814 | 1 | 0
Impact of CME Rule 814 | (1) | 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 | 14 | 0
Impact of CME Rule 814 | (14) | 0
Total commodity derivatives | 0 | 0
Total | $ 0 | $ 0

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