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Pension Plans and Other Post-Retirement Benefits - Schedule of Expected Future Benefit Payments (Details)
$ in Millions
Dec. 31, 2018
CAD ($)
Disclosure of defined benefit plans [line items]  
2019 $ 176
2020 184
2021 191
2022 200
2023 207
2024 to 2028 1,114
Pension  
Disclosure of defined benefit plans [line items]  
2019 160
2020 168
2021 175
2022 183
2023 190
2024 to 2028 1,022
Other post-retirement  
Disclosure of defined benefit plans [line items]  
2019 16
2020 16
2021 16
2022 17
2023 17
2024 to 2028 $ 92