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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, 2024 | Dec. 31, 2023
--- | --- | ---
Financial assets [Abstract] |  |
Value before application of CME Rule 814 | $ 628 | $ 728
Impact of CME Rule 814 | (246) | (278)
Total commodity derivatives | 382 | 450
Total | 382 | 450
Financial liabilities [Abstract] |  |
Interest rate derivatives |  | 31
Commodity derivatives: |  |
Value before application of CME Rule 814 | 680 | 625
Impact of CME Rule 814 | (296) | (154)
Total commodity derivatives | 384 | 471
Total | 384 | 502
Net value before application of CME Rule 814 to commodity hedging portfolio | (52) |
Level 1 [Member] |  |
Financial assets [Abstract] |  |
Value before application of CME Rule 814 | 283 | 431
Impact of CME Rule 814 | (89) | (147)
Total commodity derivatives | 194 | 284
Total | 194 | 284
Financial liabilities [Abstract] |  |
Interest rate derivatives |  | 0
Commodity derivatives: |  |
Value before application of CME Rule 814 | 383 | 317
Impact of CME Rule 814 | (170) | (22)
Total commodity derivatives | 213 | 295
Total | 213 | 295
Level 2 [Member] |  |
Financial assets [Abstract] |  |
Value before application of CME Rule 814 | 345 | 297
Impact of CME Rule 814 | (157) | (131)
Total commodity derivatives | 188 | 166
Total | 188 | 166
Financial liabilities [Abstract] |  |
Interest rate derivatives |  | 31
Commodity derivatives: |  |
Value before application of CME Rule 814 | 297 | 308
Impact of CME Rule 814 | (126) | (132)
Total commodity derivatives | 171 | 176
Total | 171 | 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 | 0 | 0
Impact of CME Rule 814 | 0 | 0
Total commodity derivatives | 0 | 0
Total | $ 0 | $ 0

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