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Revenue (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Changes in transaction price | $ 11 | $ 0
Performance obligations satisfied | 1 | $ 2
Canadian Gas |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Transaction price allocated to remaining performance obligations | 31 |
Australian Gas |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Transaction price allocated to remaining performance obligations | 2,500 |
Gas |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Transaction price allocated to remaining performance obligations | 336 |
Hydro |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Transaction price allocated to remaining performance obligations | 46 |
Wind and Solar |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Transaction price allocated to remaining performance obligations | 9 |
Second to fifth years inclusive | Australian Gas |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Transaction price allocated to remaining performance obligations | 285 |
Minimum | Australian Gas |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Transaction price allocated to remaining performance obligations | 85 |
Minimum | 2024 | Gas |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Transaction price allocated to remaining performance obligations | 5 |
Minimum | Annually thereafter | Gas |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Transaction price allocated to remaining performance obligations | 40 |
Maximum | Australian Gas |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Transaction price allocated to remaining performance obligations | 145 |
Maximum | 2024 | Gas |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Transaction price allocated to remaining performance obligations | 10 |
Maximum | Annually thereafter | Gas |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Transaction price allocated to remaining performance obligations | $ 45 |

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