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Supplementary Oil and Gas Information (Changes in Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]      
Balance, Beginning of Year $ 13,672 $ 16,082 $ 27,499
Sales of oil and gas produced during the year (4,360) (4,564) (5,036)
Discoveries and extensions, net of related costs 703 2,258 2,200
Purchases of proved reserves in place 1,494 34 2,464
Sales and transfers of proved reserves in place (1,551) (11) (1,765)
Net change in prices and production costs (2,566) (3,404) (12,597)
Revisions to quantity estimates 811 (925) (5,393)
Accretion of discount 1,540 1,835 3,384
Development costs incurred during the year 2,170 2,291 2,759
Changes in estimated future development costs 692 (460) (1,504)
Other (1) (1) 1
Net change in income taxes 310 537 4,070
Balance, End of Year 12,914 13,672 16,082
United States [Member]      
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]      
Balance, Beginning of Year 12,860 11,775 18,968
Sales of oil and gas produced during the year (3,163) (3,984) (3,969)
Discoveries and extensions, net of related costs 338 2,106 1,141
Purchases of proved reserves in place 587 34 2,440
Sales and transfers of proved reserves in place (1,551) (11) (1,765)
Net change in prices and production costs (3,678) (1,704) (5,730)
Revisions to quantity estimates 90 2,148 (5,250)
Accretion of discount 1,451 1,286 2,290
Development costs incurred during the year 1,555 1,850 2,184
Changes in estimated future development costs 1,053 (67) (1,384)
Other (1) 0 1
Net change in income taxes 354 (573) 2,849
Balance, End of Year 9,895 12,860 11,775
Canada [Member]      
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]      
Balance, Beginning of Year 812 4,307 8,531
Sales of oil and gas produced during the year (1,197) (580) (1,067)
Discoveries and extensions, net of related costs 365 152 1,059
Purchases of proved reserves in place 907 0 24
Sales and transfers of proved reserves in place 0 0 0
Net change in prices and production costs 1,112 (1,700) (6,867)
Revisions to quantity estimates 721 (3,073) (143)
Accretion of discount 89 549 1,094
Development costs incurred during the year 615 441 575
Changes in estimated future development costs (361) (393) (120)
Other (0) (1) 0
Net change in income taxes (44) 1,110 1,221
Balance, End of Year $ 3,019 $ 812 $ 4,307