XML 181 R146.htm IDEA: XBRL DOCUMENT v3.22.0.1
Decommissioning Liabilities - Summary of Changes to the Credit-Adjusted Risk-Free Rate or the Inflation Rate Impact on the Decommissioning Liabilities (Detail) - CAD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
One percent increase    
Disclosure of other provisions [line items]    
Credit-Adjusted Risk-Free Rate $ (623) $ (228)
Inflation Rate 873 321
One percent decrease    
Disclosure of other provisions [line items]    
Credit-Adjusted Risk-Free Rate 875 313
Inflation Rate $ (625) $ (235)