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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, 2023 | Dec. 31, 2022
--- | --- | ---
Financial assets [Abstract] |  |
Interest rate derivatives |  | $ 26
Value before application of CME Rule 814 | $ 728 | 1,336
Impact of CME Rule 814 | (278) | (850)
Total commodity derivatives | 450 | 486
Total | 450 | 512
Financial liabilities [Abstract] |  |
Interest rate derivatives | 31 |
Commodity derivatives: |  |
Value before application of CME Rule 814 | 625 | 1,213
Impact of CME Rule 814 | (154) | (801)
Total commodity derivatives | 471 | 412
Total | 502 | 412
Net value before application of CME Rule 814 to commodity hedging portfolio | 103 |
Level 1 [Member] |  |
Financial assets [Abstract] |  |
Interest rate derivatives |  | 0
Value before application of CME Rule 814 | 431 | 166
Impact of CME Rule 814 | (147) | (161)
Total commodity derivatives | 284 | 5
Total | 284 | 5
Financial liabilities [Abstract] |  |
Interest rate derivatives | 0 |
Commodity derivatives: |  |
Value before application of CME Rule 814 | 317 | 95
Impact of CME Rule 814 | (22) | (90)
Total commodity derivatives | 295 | 5
Total | 295 | 5
Level 2 [Member] |  |
Financial assets [Abstract] |  |
Interest rate derivatives |  | 26
Value before application of CME Rule 814 | 297 | 1,170
Impact of CME Rule 814 | (131) | (689)
Total commodity derivatives | 166 | 481
Total | 166 | 507
Financial liabilities [Abstract] |  |
Interest rate derivatives | 31 |
Commodity derivatives: |  |
Value before application of CME Rule 814 | 308 | 1,118
Impact of CME Rule 814 | (132) | (711)
Total commodity derivatives | 176 | 407
Total | 207 | 407
Level 3 [Member] |  |
Financial assets [Abstract] |  |
Interest rate derivatives |  | 0
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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