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Supplementary Oil and Gas Information (Costs Incurred) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Costs Incurred (Line Items)      
Unproved oil and gas properties $ 188 $ 0 $ 1,063
Proved 2,521 205 3,874
Total Acquisition Costs 2,709 205 4,937
Exploration Costs 3 6 3
Development Costs 2,103 2,392 2,786
Total Costs Incurred 4,815 2,603 7,726
United States [Member]      
Costs Incurred (Line Items)      
Unproved oil and gas properties 60 0 1,063
Proved 200 200 3,868
Total Acquisition Costs 260 200 4,931
Exploration Costs 2 6 3
Development Costs 1,553 1,925 2,224
Total Costs Incurred 1,815 2,131 7,158
Canada [Member]      
Costs Incurred (Line Items)      
Unproved oil and gas properties 128 0 0
Proved 2,321 5 6
Total Acquisition Costs 2,449 5 6
Exploration Costs 1 0 0
Development Costs 550 467 562
Total Costs Incurred $ 3,000 $ 472 $ 568