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Revenue Disaggregation of Revenue (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues $ 2,249 $ 2,307 $ 2,397
Goods or services transferred at point in time [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 65    
Goods or services transferred over time [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 1,114    
Contract With Customers [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 1,179    
Lease Income [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 170    
Contingent rents recognised as income, classified as operating lease   $ 247 $ 221
Derivatives Income [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 165    
Government Incentives [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 16    
Others      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 719    
Canadian Coal      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 912    
Canadian Coal | Goods or services transferred at point in time [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 38    
Canadian Coal | Goods or services transferred over time [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 479    
Canadian Coal | Contract With Customers [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 517    
Canadian Coal | Lease Income [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 68    
Canadian Coal | Derivatives Income [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues (1)    
Canadian Coal | Government Incentives [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 0    
Canadian Coal | Others      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 328    
United States Coal      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 442    
United States Coal | Goods or services transferred at point in time [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 9    
United States Coal | Goods or services transferred over time [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 0    
United States Coal | Contract With Customers [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 9    
United States Coal | Lease Income [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 0    
United States Coal | Derivatives Income [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 115    
United States Coal | Government Incentives [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 0    
United States Coal | Others      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 318    
Canadian Gas      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 232    
Canadian Gas | Goods or services transferred at point in time [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 0    
Canadian Gas | Goods or services transferred over time [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 224    
Canadian Gas | Contract With Customers [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 224    
Canadian Gas | Lease Income [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 0    
Canadian Gas | Derivatives Income [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 4    
Canadian Gas | Government Incentives [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 0    
Canadian Gas | Others      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 4    
Australian Gas      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 165    
Australian Gas | Goods or services transferred at point in time [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 0    
Australian Gas | Goods or services transferred over time [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 91    
Australian Gas | Contract With Customers [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 91    
Australian Gas | Lease Income [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 68    
Australian Gas | Derivatives Income [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 0    
Australian Gas | Government Incentives [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 0    
Australian Gas | Others      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 6    
Wind and Solar      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 282    
Wind and Solar | Goods or services transferred at point in time [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 18    
Wind and Solar | Goods or services transferred over time [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 188    
Wind and Solar | Contract With Customers [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 206    
Wind and Solar | Lease Income [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 27    
Wind and Solar | Derivatives Income [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues (20)    
Wind and Solar | Government Incentives [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 16    
Wind and Solar | Others      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 53    
Hydro      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 156    
Hydro | Goods or services transferred at point in time [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 0    
Hydro | Goods or services transferred over time [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 132    
Hydro | Contract With Customers [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 132    
Hydro | Lease Income [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 7    
Hydro | Derivatives Income [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 0    
Hydro | Government Incentives [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 0    
Hydro | Others      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 17    
Energy Marketing      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 67    
Energy Marketing | Goods or services transferred at point in time [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 0    
Energy Marketing | Goods or services transferred over time [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 0    
Energy Marketing | Contract With Customers [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 0    
Energy Marketing | Lease Income [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 0    
Energy Marketing | Derivatives Income [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 67    
Energy Marketing | Government Incentives [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 0    
Energy Marketing | Others      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 0    
Corporate      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues (7)    
Corporate | Goods or services transferred at point in time [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 0    
Corporate | Goods or services transferred over time [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 0    
Corporate | Contract With Customers [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 0    
Corporate | Lease Income [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 0    
Corporate | Derivatives Income [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 0    
Corporate | Government Incentives [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues 0    
Corporate | Others      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenues $ (7)