v3.26.1
financial instruments - Liquidity risk (Details) - CAD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Liquidity risk    
Equity securities that may be offered pursuant to a shelf prospectus $ 1,900  
Total 56,687 $ 57,627
Non-interest bearing financial liabilities    
Liquidity risk    
Contractual maturities, non-derivative liabilities 3,343 3,297
Short-term borrowings    
Liquidity risk    
Contractual maturities, non-derivative liabilities 1,274 976
Long-term debt excluding leases    
Liquidity risk    
Contractual maturities, non-derivative liabilities 49,081 49,528
Leases    
Liquidity risk    
Contractual maturities, non-derivative liabilities 3,846 4,157
Composite long-term debt    
Liquidity risk    
Total 52,039  
Other Derivative    
Liquidity risk    
Contractual maturities, derivative liabilities 46 29
First year    
Liquidity risk    
Total 6,314 7,716
First year | Non-interest bearing financial liabilities    
Liquidity risk    
Contractual maturities, non-derivative liabilities 3,000 3,106
First year | Short-term borrowings    
Liquidity risk    
Contractual maturities, non-derivative liabilities 22 37
First year | Long-term debt excluding leases    
Liquidity risk    
Contractual maturities, non-derivative liabilities 3,067 3,754
First year | Leases    
Liquidity risk    
Contractual maturities, non-derivative liabilities 331 837
First year | Other Derivative    
Liquidity risk    
Contractual maturities, derivative liabilities 2 3
2 years hence    
Liquidity risk    
Total 4,777 4,507
2 years hence | Non-interest bearing financial liabilities    
Liquidity risk    
Contractual maturities, non-derivative liabilities 259 108
2 years hence | Short-term borrowings    
Liquidity risk    
Contractual maturities, non-derivative liabilities 1,252 939
2 years hence | Long-term debt excluding leases    
Liquidity risk    
Contractual maturities, non-derivative liabilities 2,830 2,799
2 years hence | Leases    
Liquidity risk    
Contractual maturities, non-derivative liabilities 603 739
2 years hence | Other Derivative    
Liquidity risk    
Contractual maturities, derivative liabilities 4 3
3 years hence    
Liquidity risk    
Total 3,690 3,801
3 years hence | Non-interest bearing financial liabilities    
Liquidity risk    
Contractual maturities, non-derivative liabilities 64 62
3 years hence | Long-term debt excluding leases    
Liquidity risk    
Contractual maturities, non-derivative liabilities 3,111 3,137
3 years hence | Leases    
Liquidity risk    
Contractual maturities, non-derivative liabilities 528 589
3 years hence | Other Derivative    
Liquidity risk    
Contractual maturities, derivative liabilities 3 3
4 years hence    
Liquidity risk    
Total 2,898 2,926
4 years hence | Non-interest bearing financial liabilities    
Liquidity risk    
Contractual maturities, non-derivative liabilities 8 8
4 years hence | Long-term debt excluding leases    
Liquidity risk    
Contractual maturities, non-derivative liabilities 2,493 2,519
4 years hence | Leases    
Liquidity risk    
Contractual maturities, non-derivative liabilities 434 422
4 years hence | Other Derivative    
Liquidity risk    
Contractual maturities, derivative liabilities 3 3
5 years hence    
Liquidity risk    
Total 2,988 3,239
5 years hence | Non-interest bearing financial liabilities    
Liquidity risk    
Contractual maturities, non-derivative liabilities 6 6
5 years hence | Long-term debt excluding leases    
Liquidity risk    
Contractual maturities, non-derivative liabilities 2,695 2,977
5 years hence | Leases    
Liquidity risk    
Contractual maturities, non-derivative liabilities 356 276
5 years hence | Other Derivative    
Liquidity risk    
Contractual maturities, derivative liabilities 3 3
5 years hence to 10 years    
Liquidity risk    
Total 11,107 11,033
5 years hence to 10 years | Non-interest bearing financial liabilities    
Liquidity risk    
Contractual maturities, non-derivative liabilities 6 7
5 years hence to 10 years | Long-term debt excluding leases    
Liquidity risk    
Contractual maturities, non-derivative liabilities 10,596 10,500
5 years hence to 10 years | Leases    
Liquidity risk    
Contractual maturities, non-derivative liabilities 789 648
5 years hence to 10 years | Other Derivative    
Liquidity risk    
Contractual maturities, derivative liabilities 15 11
Thereafter    
Liquidity risk    
Total 24,913 24,405
Thereafter | Long-term debt excluding leases    
Liquidity risk    
Contractual maturities, non-derivative liabilities 24,289 23,842
Thereafter | Leases    
Liquidity risk    
Contractual maturities, non-derivative liabilities 805 646
Thereafter | Other Derivative    
Liquidity risk    
Contractual maturities, derivative liabilities 16 3
Currency risk related to long-term debt | Currency swap agreement    
Liquidity risk    
Amounts to be exchanged, (Receive) (14,305) (12,903)
Amounts to be exchanged, Pay 13,417 12,516
Currency risk related to long-term debt | Composite long-term debt    
Liquidity risk    
Total 52,039 53,298
Currency risk related to long-term debt | First year | Currency swap agreement    
Liquidity risk    
Amounts to be exchanged, (Receive) (2,350) (1,373)
Amounts to be exchanged, Pay 2,257 1,356
Currency risk related to long-term debt | 2 years hence | Currency swap agreement    
Liquidity risk    
Amounts to be exchanged, (Receive) (1,988) (1,917)
Amounts to be exchanged, Pay 1,841 1,841
Currency risk related to long-term debt | 3 years hence | Currency swap agreement    
Liquidity risk    
Amounts to be exchanged, (Receive) (387) (373)
Amounts to be exchanged, Pay 347 347
Currency risk related to long-term debt | 4 years hence | Currency swap agreement    
Liquidity risk    
Amounts to be exchanged, (Receive) (387) (373)
Amounts to be exchanged, Pay 347 347
Currency risk related to long-term debt | 5 years hence | Currency swap agreement    
Liquidity risk    
Amounts to be exchanged, (Receive) (1,381) (1,332)
Amounts to be exchanged, Pay 1,309 1,309
Currency risk related to long-term debt | 5 years hence to 10 years | Currency swap agreement    
Liquidity risk    
Amounts to be exchanged, (Receive) (4,678) (4,512)
Amounts to be exchanged, Pay 4,379 4,379
Currency risk related to long-term debt | Thereafter | Currency swap agreement    
Liquidity risk    
Amounts to be exchanged, (Receive) (3,134) (3,023)
Amounts to be exchanged, Pay 2,937 2,937
Currency risk related to foreign currency transactions | Currency swap agreement    
Liquidity risk    
Amounts to be exchanged, (Receive) (1,408) (1,366)
Amounts to be exchanged, Pay 1,393 1,393
Currency risk related to foreign currency transactions | First year | Currency swap agreement    
Liquidity risk    
Amounts to be exchanged, (Receive) (468) (845)
Amounts to be exchanged, Pay 453 841
Currency risk related to foreign currency transactions | 2 years hence | Currency swap agreement    
Liquidity risk    
Amounts to be exchanged, (Receive) (454) (52)
Amounts to be exchanged, Pay 430 47
Currency risk related to foreign currency transactions | 3 years hence | Currency swap agreement    
Liquidity risk    
Amounts to be exchanged, (Receive) (486) (469)
Amounts to be exchanged, Pay $ 510 $ 505