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Hedging Activities and Fair Value Measurements - Schedule of Gains and Losses on Derivative Instruments and Related Hedged Items (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Derivatives not designated as hedging instruments: |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (Loss) Recognized in Income on Derivative | $ 40 | $ 22 | $ 213
Commodity Derivative Instruments | Revenue | Derivatives not designated as hedging instruments: |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (Loss) Recognized in Income on Derivative | 45 | 26 | 213
Commodity Derivative Instruments | Operating costs and expenses | Derivatives not designated as hedging instruments: |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (Loss) Recognized in Income on Derivative | (5) | (4) | 0
Fair value hedge |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (Loss) Recognized in Income on Derivative | 5 | 2 | 7
Gain (Loss) Recognized in Income on Hedged Item | (3) | 9 | (7)
Fair value hedge | Commodity Derivative Instruments |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (Loss) Recognized in Income on Derivative | $ 5 | $ 2 | $ 7
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Revenues | Revenues | Revenues
Fair value hedge | Commodity Derivative Instruments | Revenue |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (Loss) Recognized in Income on Hedged Item | $ (3) | $ 9 | $ (7)
Cash flow hedge |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Change in Value Recognized in Other Comprehensive Income (Loss) on Derivative | 299 | 113 | 57
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) to Income | 199 | 184 | 115
Cash flow hedge | Commodity Derivative Instruments | Revenue |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Change in Value Recognized in Other Comprehensive Income (Loss) on Derivative | 321 | 182 | 81
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) to Income | 235 | 249 | 106
Cash flow hedge | Commodity Derivative Instruments | Operating costs and expenses |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Change in Value Recognized in Other Comprehensive Income (Loss) on Derivative | (36) | (67) | 12
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) to Income | (43) | (71) | 4
Cash flow hedge | Interest Rate Derivative Instruments |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Change in Value Recognized in Other Comprehensive Income (Loss) on Derivative | 14 | (2) | (36)
Cash flow hedge | Interest Rate Derivative Instruments | Interest expense |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) to Income | $ 7 | $ 6 | $ 5

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- Definition Amount of the increase (decrease) in fair value of the hedged item in a fair value hedge recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4C -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4C Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 182 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480401/815-10-55-182 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4A -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 21 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147476148/220-40-50-21 + Details
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