v3.26.1
Segmented Information (Segment Information) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Segment Reporting Information [Line Items]    
Revenues $ 2,577 $ 2,375
Gains (losses) on risk management, net (63) (16)
Sublease revenues 18 18
Total Revenues 2,532 2,377
Production, mineral and other taxes 79 87
Transportation and processing 471 398
Operating 227 205
Purchased product 344 402
Depreciation, depletion and amortization 561 545
Impairments 1,485 730
Accretion of asset retirement obligation 7 6
Administrative 112 93
Total Operating Expenses 3,286 2,466
Operating Income (Loss) (754) (89)
Interest 104 97
Foreign exchange (gain) loss, net (2) 10
Other (gains) losses, net (29) (3)
Total Other (Income) Expenses 73 104
Net Earnings (Loss) Before Income Tax (827) (193)
Income tax expense (recovery) (197) (34)
Net Earnings (Loss) (630) (159)
Product and Service Revenues [Member]    
Segment Reporting Information [Line Items]    
Revenues 2,221 1,965
Sales of Purchased Product [Member]    
Segment Reporting Information [Line Items]    
Revenues 356 410
Operating Segments [Member] | USA Operations [Member]    
Segment Reporting Information [Line Items]    
Gains (losses) on risk management, net (23) 0
Sublease revenues 0 0
Total Revenues 1,473 1,680
Production, mineral and other taxes 71 83
Transportation and processing 115 112
Operating 176 169
Purchased product 267 368
Depreciation, depletion and amortization 336 375
Impairments 1,111 0
Total Operating Expenses 2,076 1,107
Operating Income (Loss) (603) 573
Operating Segments [Member] | USA Operations [Member] | Product and Service Revenues [Member]    
Segment Reporting Information [Line Items]    
Revenues 1,229 1,312
Operating Segments [Member] | USA Operations [Member] | Sales of Purchased Product [Member]    
Segment Reporting Information [Line Items]    
Revenues 267 368
Operating Segments [Member] | Canadian Operations [Member]    
Segment Reporting Information [Line Items]    
Gains (losses) on risk management, net 13 30
Sublease revenues 0 0
Total Revenues 1,094 725
Production, mineral and other taxes 8 4
Transportation and processing 356 286
Operating 51 36
Purchased product 77 34
Depreciation, depletion and amortization 220 165
Impairments 374 730
Total Operating Expenses 1,086 1,255
Operating Income (Loss) 8 (530)
Operating Segments [Member] | Canadian Operations [Member] | Product and Service Revenues [Member]    
Segment Reporting Information [Line Items]    
Revenues 992 653
Operating Segments [Member] | Canadian Operations [Member] | Sales of Purchased Product [Member]    
Segment Reporting Information [Line Items]    
Revenues 89 42
Corporate & Other [Member]    
Segment Reporting Information [Line Items]    
Revenues 0 0
Gains (losses) on risk management, net (53) (46)
Sublease revenues 18 18
Total Revenues (35) (28)
Production, mineral and other taxes 0 0
Transportation and processing 0 0
Operating 0 0
Purchased product 0 0
Depreciation, depletion and amortization 5 5
Impairments 0 0
Accretion of asset retirement obligation 7 6
Administrative 112 93
Total Operating Expenses 124 104
Operating Income (Loss) (159) (132)
Corporate & Other [Member] | Product and Service Revenues [Member]    
Segment Reporting Information [Line Items]    
Revenues 0 0
Corporate & Other [Member] | Sales of Purchased Product [Member]    
Segment Reporting Information [Line Items]    
Revenues $ 0 $ 0