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Consolidated statement of comprehensive income (U.S. GAAP, unaudited) - CAD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Statement of Comprehensive Income [Abstract]        
Net income (loss) $ 539 $ 1,237 $ 2,776 $ 3,565
Other comprehensive income (loss), net of income taxes        
Postretirement benefits liability adjustment (excluding amortization) 0 0 12 4
Amortization of postretirement benefits liability adjustment included in net benefit costs 5 13 15 38
Total other comprehensive income (loss) 5 13 27 42
Comprehensive income (loss) $ 544 $ 1,250 $ 2,803 $ 3,607