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Supplementary Oil and Gas Information (Costs Not Subject to Depletion or Amortization) (Details) - USD ($) $ in Millions | Dec. 31, 2025 | Dec. 31, 2024
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Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items] |  |
Capitalized Costs of Unproved Properties Excluded from Amortization, Cumulative | $ 434 | $ 764
United States [Member] |  |
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items] |  |
Capitalized Costs of Unproved Properties Excluded from Amortization, Cumulative | 316 | 741
Canada [Member] |  |
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items] |  |
Capitalized Costs of Unproved Properties Excluded from Amortization, Cumulative | $ 118 | $ 23

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- Definition Amount of capitalized cost excluded from amortization for investment in unproved property and development project for oil- and gas-producing activities accounted for under full cost method. Includes, but is not limited to, acquisition, exploration, and development costs for development project and capitalized interest. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 932 -SubTopic 360 -Name Accounting Standards Codification -Section S50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477385/932-360-S50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 932 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10(c)(7)(ii)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479664/932-10-S99-1 + Details
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