XML 56 R138.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Goodwill (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2019
CAD ($)
MWh
Dec. 31, 2018
CAD ($)
MWh
Disclosure of detailed information about intangible assets [line items]    
Goodwill $ 464 $ 464
Hydro    
Disclosure of detailed information about intangible assets [line items]    
Goodwill 258 259
Wind and Solar    
Disclosure of detailed information about intangible assets [line items]    
Goodwill 176 175
Energy Marketing    
Disclosure of detailed information about intangible assets [line items]    
Goodwill $ 30 $ 30
Minimum    
Disclosure of detailed information about intangible assets [line items]    
Electricity prices | MWh 5 6
Discount rate used to calculate goodwill impairment 3.60% 5.30%
Maximum    
Disclosure of detailed information about intangible assets [line items]    
Electricity prices | MWh 183 179
Discount rate used to calculate goodwill impairment 7.00% 6.60%