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Segmented Information (Segment Information) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Segment Reporting Information [Line Items]      
Revenues $ 8,663 $ 8,943 $ 10,661
Gains (losses) on risk management, net 172 135 151
Sublease revenues 73 74 71
Total Revenues 8,908 9,152 10,883
Production, mineral and other taxes 286 333 342
Transportation and processing 1,724 1,639 1,766
Operating 862 931 859
Purchased product 1,447 1,546 2,815
Depreciation, depletion and amortization 2,179 2,290 1,825
Impairments 920 450 0
Accretion of asset retirement obligation 28 19 19
Administrative 331 365 393
Total Operating Expenses 7,777 7,573 8,019
Operating Income (Loss) 1,131 1,579 2,864
Interest 376 412 355
Foreign exchange (gain) loss, net 31 (19) 19
Other (gains) losses, net (46) (165) (20)
Total Other (Income) Expenses 361 228 354
Net Earnings (Loss) Before Income Tax 770 1,351 2,510
Income tax expense (recovery) (472) 226 425
Net Earnings (Loss) 1,242 1,125 2,085
Product and Service Revenues [Member]      
Segment Reporting Information [Line Items]      
Revenues 7,176 7,358 7,812
Sales of Purchased Product [Member]      
Segment Reporting Information [Line Items]      
Revenues 1,487 1,585 2,849
Operating Segments [Member] | USA Operations [Member]      
Segment Reporting Information [Line Items]      
Gains (losses) on risk management, net 51 119 10
Sublease revenues 0 0 0
Total Revenues 5,935 7,180 8,186
Production, mineral and other taxes 265 319 327
Transportation and processing 453 560 683
Operating 701 810 757
Purchased product 1,310 1,446 2,587
Depreciation, depletion and amortization 1,475 1,971 1,519
Impairments 49 0 0
Total Operating Expenses 4,253 5,106 5,873
Operating Income (Loss) 1,682 2,074 2,313
Operating Segments [Member] | USA Operations [Member] | Product and Service Revenues [Member]      
Segment Reporting Information [Line Items]      
Revenues 4,573 5,612 5,586
Operating Segments [Member] | USA Operations [Member] | Sales of Purchased Product [Member]      
Segment Reporting Information [Line Items]      
Revenues 1,311 1,449 2,590
Operating Segments [Member] | Canadian Operations [Member]      
Segment Reporting Information [Line Items]      
Gains (losses) on risk management, net 115 152 (53)
Sublease revenues 0 0 0
Total Revenues 2,894 2,034 2,432
Production, mineral and other taxes 21 14 15
Transportation and processing 1,271 1,079 1,083
Operating 161 121 102
Purchased product 137 100 228
Depreciation, depletion and amortization 683 297 286
Impairments 871 450 0
Total Operating Expenses 3,144 2,061 1,714
Operating Income (Loss) (250) (27) 718
Operating Segments [Member] | Canadian Operations [Member] | Product and Service Revenues [Member]      
Segment Reporting Information [Line Items]      
Revenues 2,603 1,746 2,226
Operating Segments [Member] | Canadian Operations [Member] | Sales of Purchased Product [Member]      
Segment Reporting Information [Line Items]      
Revenues 176 136 259
Corporate & Other [Member]      
Segment Reporting Information [Line Items]      
Revenues 0 0 0
Gains (losses) on risk management, net 6 (136) 194
Sublease revenues 73 74 71
Total Revenues 79 (62) 265
Transportation and processing 0 0 0
Operating 0 0 0
Purchased product 0 0 0
Depreciation, depletion and amortization 21 22 20
Impairments 0    
Accretion of asset retirement obligation 28 19 19
Administrative 331 365 393
Total Operating Expenses 380 406 432
Operating Income (Loss) (301) (468) (167)
Corporate & Other [Member] | Product and Service Revenues [Member]      
Segment Reporting Information [Line Items]      
Revenues 0 0 0
Corporate & Other [Member] | Sales of Purchased Product [Member]      
Segment Reporting Information [Line Items]      
Revenues $ 0 $ 0 $ 0