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Supplementary Oil and Gas Information (Results of Operations) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Results of Operations for Oil and Gas Producing Activities, by Geographic Area [Line Items]      
Oil, NGL and Natural Gas Revenues [1] $ 7,176 $ 7,358 $ 7,812
Production, mineral and other taxes 286 333 342
Transportation and processing [2] 1,685 1,553 1,603
Operating [2] 845 908 831
Depreciation, depletion and amortization 2,158 2,268 1,805
Impairments 920 450  
Accretion of asset retirement obligation 28 19 19
Operating Income (Loss) 1,254 1,827 3,212
Income Taxes 265 394 713
Results of Operations 989 1,433 2,499
United States [Member]      
Results of Operations for Oil and Gas Producing Activities, by Geographic Area [Line Items]      
Oil, NGL and Natural Gas Revenues [1] 4,573 5,612 5,586
Production, mineral and other taxes 265 319 327
Transportation and processing [2] 450 510 547
Operating [2] 695 799 743
Depreciation, depletion and amortization 1,475 1,971 1,519
Impairments 49    
Accretion of asset retirement obligation 10 9 8
Operating Income (Loss) 1,629 2,004 2,442
Income Taxes 354 436 531
Results of Operations 1,275 1,568 1,911
Canada [Member]      
Results of Operations for Oil and Gas Producing Activities, by Geographic Area [Line Items]      
Oil, NGL and Natural Gas Revenues [1] 2,603 1,746 2,226
Production, mineral and other taxes 21 14 15
Transportation and processing [2] 1,235 1,043 1,056
Operating [2] 150 109 88
Depreciation, depletion and amortization 683 297 286
Impairments 871 450  
Accretion of asset retirement obligation 18 10 11
Operating Income (Loss) (375) (177) 770
Income Taxes (89) (42) 182
Results of Operations $ (286) $ (135) $ 588
[1] Excludes gains (losses) on risk management and sales of volumes purchased from third parties.
[2] Excludes costs related to the purchase and sale of third-party volumes.