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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) |  |

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