XML 204 R169.htm IDEA: XBRL DOCUMENT v3.22.0.1
Financial Instruments - Additional information (Detail)
$ in Millions
Dec. 31, 2021
CAD ($)
$ / bbl
Dec. 31, 2020
CAD ($)
Dec. 31, 2019
CAD ($)
Disclosure of detailed information about financial instruments [line items]      
Long-Term Debt $ 12,385 $ 7,441  
Cash collateral for risk management contracts price change $ 114 59  
Discounted credit adjusted risk free rate 2.90%    
Estimated fair value of contingent payment $ 236 63 $ 143
WCS Forward Prices      
Disclosure of detailed information about financial instruments [line items]      
Average forward price for Western Canadian Select Crude Oil for the remaining term (in CAD per barrel) | $ / bbl 77.87    
WTI Option Implied Volatility      
Disclosure of detailed information about financial instruments [line items]      
Average implied volatility contingent payment percentage 39.50%    
U.S. to Canadian Dollar Foreign Exchange Average Rate Volatility Contingent Payment      
Disclosure of detailed information about financial instruments [line items]      
Average implied volatility contingent payment percentage 6.40%    
Level 2 of fair value hierarchy      
Disclosure of detailed information about financial instruments [line items]      
Debt, fair value $ 13,700 $ 8,600