XML 134 R99.htm IDEA: XBRL DOCUMENT v3.22.0.1
Impairment Charges and Reversals - Additional Information (Detail)
 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2020
CAD ($)
Sep. 30, 2020
CAD ($)
Dec. 31, 2021
CAD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
CAD ($)
Dec. 31, 2019
CAD ($)
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]            
Recoverable Amount     $ 2,000,000,000      
Goodwill impairments       $ 0 $ 0  
Discounted future cash flows            
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]            
Significant unobservable input, assets   0.10        
Discounted future cash flows | Inflation rate            
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]            
Significant unobservable input, assets     0.02   0.02  
Discounted future cash flows | Minimum            
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]            
Significant unobservable input, assets         10  
Discounted future cash flows | Minimum | Discount rate            
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]            
Significant unobservable input, assets     0.10      
Discounted future cash flows | Maximum            
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]            
Significant unobservable input, assets         15  
Discounted future cash flows | Maximum | Discount rate            
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]            
Significant unobservable input, assets     0.15      
Downstream            
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]            
Goodwill impairments         $ 0  
Downstream | Discounted future cash flows | Minimum            
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]            
Significant unobservable input, assets     0.10      
Downstream | Discounted future cash flows | Maximum            
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]            
Significant unobservable input, assets     0.12      
Downstream | Growth rate            
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]            
Significant unobservable input, assets     0.02   0.02  
Conventional            
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]            
CGU Impairments         $ 555,000,000  
Reversal of Impairment     $ 378,000,000      
U.S. Manufacturing            
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]            
CGU Impairments     11,000,000      
CGUs | Upstream            
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]            
CGU Impairments     0     $ 0
Goodwill impairments     0     $ 0
CGUs | Conventional | Upstream            
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]            
CGU Impairments $ 315,000,000       $ 240,000,000  
Borger CGU | Downstream            
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]            
Recoverable Amount   $ 692,000,000        
Borger CGU | U.S. Manufacturing | Downstream            
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]            
CGU Impairments   450,000,000        
Wood River CGU | Downstream            
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]            
Goodwill impairments   $ 0        
Borger, Wood River, and Lima CGUs | Downstream            
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]            
CGU Impairments     1,900,000,000      
Amount by which unit's recoverable amount exceeds its carrying amount     2,500,000,000      
Toledo CGU | Downstream            
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]            
CGU Impairments     $ 0      
Railcar CGU            
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]            
CGU Impairments $ 3,000,000