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Pension Plans and Other Post-Retirement Benefits - Schedule of Expected Future Benefit Payments (Details)
$ in Millions
Dec. 31, 2019
CAD ($)
Disclosure of defined benefit plans [line items]  
2019 $ 165
2020 171
2021 176
2022 184
2023 187
2025 to 2029 1,017
Pension  
Disclosure of defined benefit plans [line items]  
2019 149
2020 155
2021 159
2022 167
2023 170
2025 to 2029 924
Other post-retirement  
Disclosure of defined benefit plans [line items]  
2019 16
2020 16
2021 17
2022 17
2023 17
2025 to 2029 $ 93