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Commitments and contingencies (Details)
$ in Millions
Dec. 31, 2020
CAD ($)
Disclosure of contingent liabilities [line items]  
Commitments for property, plant and equipment and intangible assets $ 3,436
Purchase obligations 1,993
Leases committed not yet commenced 6
Total 5,435
Estimated future cost impact 100
2021  
Disclosure of contingent liabilities [line items]  
Commitments for property, plant and equipment and intangible assets 975
Purchase obligations 545
Leases committed not yet commenced 2
Total 1,522
2022  
Disclosure of contingent liabilities [line items]  
Commitments for property, plant and equipment and intangible assets 835
Purchase obligations 479
Leases committed not yet commenced 2
Total 1,316
2023  
Disclosure of contingent liabilities [line items]  
Commitments for property, plant and equipment and intangible assets 608
Purchase obligations 331
Leases committed not yet commenced 1
Total 940
2024  
Disclosure of contingent liabilities [line items]  
Commitments for property, plant and equipment and intangible assets 416
Purchase obligations 225
Leases committed not yet commenced 1
Total 642
2025  
Disclosure of contingent liabilities [line items]  
Commitments for property, plant and equipment and intangible assets 250
Purchase obligations 144
Leases committed not yet commenced 0
Total 394
THERE- AFTER  
Disclosure of contingent liabilities [line items]  
Commitments for property, plant and equipment and intangible assets 352
Purchase obligations 269
Leases committed not yet commenced 0
Total $ 621