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Net Other Operating (Income) Losses (Details) - CAD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jul. 20, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of types of insurance contracts [line items] |  |  |  |
Alberta off-coal agreement, annual cash payments, gross | $ 40 | $ 40 | $ 40 | $ 0
Alberta off-coal agreement, annual cash payments, net | $ 37 |  |  |
Gains (losses) on disposals of investments |  | 157 | 0 | 0
Mississauga cogeneration facility NUG Contract |  | 0 | 9 | 191
Discounted revenue |  |  | 207 |
Contract expenses and termination charges |  |  | 16 |
Accelerated depreciation |  |  | 46 |
Cash flow hedge unrealized gains (losses) from AOCI recognized in profit or loss |  |  | 14 |
Insurance recoveries |  | 7 | 0 | 3
Business interruption [member] |  |  |  |
Disclosure of types of insurance contracts [line items] |  |  |  |
Insurance recoveries |  |  |  | 2
Wind Generation | Replacement and Refurbishment [Member] |  |  |  |
Disclosure of types of insurance contracts [line items] |  |  |  |
Insurance recoveries |  |  |  | $ 1
Canadian Coal | Equipment Repair [Member] |  |  |  |
Disclosure of types of insurance contracts [line items] |  |  |  |
Insurance recoveries |  | 1 |  |
Wyoming Wind [Member] |  |  |  |
Disclosure of types of insurance contracts [line items] |  |  |  |
Insurance recoveries |  | $ 6 |  |
Mississauga Cogeneration Facility Contract [Member] |  |  |  |
Disclosure of types of insurance contracts [line items] |  |  |  |
Mississauga cogeneration facility NUG Contract |  |  | $ 191 |

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