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Commitments (Details) - CAD ($)
$ in Millions
 1 Months Ended 6 Months Ended
Aug. 03, 2022
Dec. 31, 2022
Jun. 30, 2022
Disclosure of contingent liabilities [line items]      
Commitments for property, plant and equipment and intangible assets     $ 4,985
Purchase obligations     2,327
Leases committed not yet commenced     16
Total     7,328
Entering into significant commitments or contingent liabilities      
Disclosure of contingent liabilities [line items]      
Commitments for purchase obligations $ 1,300    
2022      
Disclosure of contingent liabilities [line items]      
Commitments for property, plant and equipment and intangible assets     826
Purchase obligations     318
Leases committed not yet commenced     7
Total     1,151
2022 | Entering into significant commitments or contingent liabilities      
Disclosure of contingent liabilities [line items]      
Commitments for purchase obligations   $ 28  
2023      
Disclosure of contingent liabilities [line items]      
Commitments for property, plant and equipment and intangible assets     1,377
Purchase obligations     497
Leases committed not yet commenced     3
Total     1,877
2023 | Entering into significant commitments or contingent liabilities      
Disclosure of contingent liabilities [line items]      
Commitments for purchase obligations   55  
2024      
Disclosure of contingent liabilities [line items]      
Commitments for property, plant and equipment and intangible assets     775
Purchase obligations     385
Leases committed not yet commenced     6
Total     1,166
2024 | Entering into significant commitments or contingent liabilities      
Disclosure of contingent liabilities [line items]      
Commitments for purchase obligations   54  
2025      
Disclosure of contingent liabilities [line items]      
Commitments for property, plant and equipment and intangible assets     559
Purchase obligations     338
Leases committed not yet commenced     0
Total     897
2025 | Entering into significant commitments or contingent liabilities      
Disclosure of contingent liabilities [line items]      
Commitments for purchase obligations   91  
2026      
Disclosure of contingent liabilities [line items]      
Commitments for property, plant and equipment and intangible assets     388
Purchase obligations     399
Leases committed not yet commenced     0
Total     787
2026 | Entering into significant commitments or contingent liabilities      
Disclosure of contingent liabilities [line items]      
Commitments for purchase obligations   164  
THERE- AFTER      
Disclosure of contingent liabilities [line items]      
Commitments for property, plant and equipment and intangible assets     1,060
Purchase obligations     390
Leases committed not yet commenced     0
Total     $ 1,450
THERE- AFTER | Entering into significant commitments or contingent liabilities      
Disclosure of contingent liabilities [line items]      
Commitments for purchase obligations   $ 908