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Business segments (Detail) - CAD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Revenues and other income          
Revenues [1] $ 11,994 $ 13,215 $ 35,668 $ 38,812  
Investment and other income (note 3) 55 44 130 113  
Total revenues and other income 12,049 13,259 35,798 38,925  
Expenses          
Exploration 1 1 3 3  
Purchases of crude oil and products [2] 7,776 8,734 22,747 25,296  
Production and manufacturing [3] 1,625 1,517 4,975 4,870  
Selling and general (note 11) [3] 622 223 1,132 690  
Federal excise tax and fuel charge 380 661 1,344 1,908  
Depreciation and depletion 911 508 1,920 1,454  
Non-service pension and postretirement benefit 25 1 36 3  
Financing (note 5) [4] 8 11 8 37  
Total expenses 11,348 11,656 32,165 34,261  
Income (loss) before income taxes 701 1,603 3,633 4,664  
Income taxes 162 366 857 1,099  
Net income (loss) 539 1,237 2,776 3,565  
Cash flows from (used in) operating activities 1,798 1,487 4,790 4,192  
Capital and exploration expenditures 505 486 1,376 1,444  
Assets 42,963 42,529 42,963 42,529 $ 42,938
Corporate and other          
Revenues and other income          
Revenues 0 0 0 0  
Investment and other income (note 3) 21 30 50 72  
Total revenues and other income 21 30 50 72  
Expenses          
Exploration 0 0 0 0  
Purchases of crude oil and products 0 0 0 0  
Production and manufacturing 7 8 18 13  
Selling and general (note 11) 433 33 556 122  
Federal excise tax and fuel charge 0 0 0 0  
Depreciation and depletion 417 10 441 29  
Non-service pension and postretirement benefit 25 1 36 3  
Financing (note 5) 5 9 17 33  
Total expenses 887 61 1,068 200  
Income (loss) before income taxes (866) (31) (1,018) (128)  
Income taxes (212) (8) (248) (29)  
Net income (loss) (654) (23) (770) (99)  
Cash flows from (used in) operating activities 49 (24) (88) 166  
Capital and exploration expenditures 34 50 104 141  
Assets 4,034 2,942 4,034 2,942  
Corporate and other | Calgary Imperial Campus          
Expenses          
Assets 466   466    
Eliminations          
Revenues and other income          
Revenues (5,647) (6,205) (17,343) (18,411)  
Total revenues and other income (5,647) (6,205) (17,343) (18,411)  
Expenses          
Exploration 0 0 0 0  
Purchases of crude oil and products (5,645) (6,203) (17,337) (18,405)  
Production and manufacturing 0 0 0 0  
Selling and general (note 11) (2) (2) (6) (6)  
Federal excise tax and fuel charge 0 0 0 0  
Depreciation and depletion 0 0 0 0  
Non-service pension and postretirement benefit 0 0 0 0  
Financing (note 5) 0 0 0 0  
Total expenses (5,647) (6,205) (17,343) (18,411)  
Income (loss) before income taxes 0 0 0 0  
Income taxes 0 0 0 0  
Net income (loss) 0 0 0 0  
Cash flows from (used in) operating activities 0 0 (15) 0  
Capital and exploration expenditures 0 0 0 0  
Assets (1,758) (155) (1,758) (155)  
Upstream | Intersegment Eliminations          
Revenues and other income          
Revenues 4,034 4,583 12,140 13,227  
Upstream | Operating Segments          
Revenues and other income          
Revenues 72 24 198 95  
Investment and other income (note 3) 3 2 13 7  
Total revenues and other income 4,109 4,609 12,351 13,329  
Expenses          
Exploration 1 1 3 3  
Purchases of crude oil and products 1,612 1,766 4,843 5,479  
Production and manufacturing 1,098 1,050 3,401 3,441  
Selling and general (note 11) 0 0 0 0  
Federal excise tax and fuel charge 0 0 0 0  
Depreciation and depletion 434 447 1,322 1,275  
Non-service pension and postretirement benefit 0 0 0 0  
Financing (note 5) 3 2 (9) 4  
Total expenses 3,148 3,266 9,560 10,202  
Income (loss) before income taxes 961 1,343 2,791 3,127  
Income taxes 233 316 668 743  
Net income (loss) 728 1,027 2,123 2,384  
Cash flows from (used in) operating activities 1,415 1,298 2,637 3,351  
Capital and exploration expenditures 353 300 972 857  
Assets 28,449 28,186 28,449 28,186  
Downstream | Intersegment Eliminations          
Revenues and other income          
Revenues 1,517 1,562 4,904 4,949  
Downstream | Operating Segments          
Revenues and other income          
Revenues 11,675 12,997 34,698 37,862  
Investment and other income (note 3) 31 11 67 32  
Total revenues and other income 13,223 14,570 39,669 42,843  
Expenses          
Exploration 0 0 0 0  
Purchases of crude oil and products 11,578 13,014 34,517 37,549  
Production and manufacturing 462 423 1,385 1,279  
Selling and general (note 11) 169 170 518 503  
Federal excise tax and fuel charge 379 660 1,340 1,905  
Depreciation and depletion 56 48 145 139  
Non-service pension and postretirement benefit 0 0 0 0  
Financing (note 5) 0 0 0 0  
Total expenses 12,644 14,315 37,905 41,375  
Income (loss) before income taxes 579 255 1,764 1,468  
Income taxes 135 50 414 338  
Net income (loss) 444 205 1,350 1,130  
Cash flows from (used in) operating activities 319 164 2,316 555  
Capital and exploration expenditures 114 133 292 435  
Assets 11,696 11,104 11,696 11,104  
Chemical | Intersegment Eliminations          
Revenues and other income          
Revenues 96 60 299 235  
Chemical | Operating Segments          
Revenues and other income          
Revenues 247 194 772 855  
Investment and other income (note 3) 0 1 0 2  
Total revenues and other income 343 255 1,071 1,092  
Expenses          
Exploration 0 0 0 0  
Purchases of crude oil and products 231 157 724 673  
Production and manufacturing 58 36 171 137  
Selling and general (note 11) 22 22 64 71  
Federal excise tax and fuel charge 1 1 4 3  
Depreciation and depletion 4 3 12 11  
Non-service pension and postretirement benefit 0 0 0 0  
Financing (note 5) 0 0 0 0  
Total expenses 316 219 975 895  
Income (loss) before income taxes 27 36 96 197  
Income taxes 6 8 23 47  
Net income (loss) 21 28 73 150  
Cash flows from (used in) operating activities 15 49 (60) 120  
Capital and exploration expenditures 4 3 8 11  
Assets $ 542 $ 452 $ 542 $ 452  
[1]
(a) Amounts from related parties included in revenues (note 1)3,345 3,755 10,340 10,829 
[2]
(b) Amounts to related parties included in purchases of crude oil and products (note 1)1,619 1,955 4,188 5,177 
[3]
(c) Amounts to related parties included in production and manufacturing, and selling
and general expenses.		88 121 382 406 
[4]
(d) Amounts to related parties included in financing.30 40 79 127