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Debt - Narrative (Details)
$ in Millions, $ in Millions
Dec. 31, 2020
CAD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
CAD ($)
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]        
Long-term debt and finance lease obligation, Current and non-current $ 9,833   $ 8,816  
Annual maturities and principal repayments in 2021 1,178      
Annual maturities and principal repayments in 2022 471      
Annual maturities and principal repayments in 2023 475      
Annual maturities and principal repayments in 2024 83      
Annual maturities and principal repayments in 2025 $ 891      
U.S dollar-denominated        
Debt Instrument [Line Items]        
Long-term debt and finance lease obligation, Current and non-current   $ 6,713   $ 6,016