Commitments and Contingencies - Other Commitments (Narrative) (Details) |
12 Months Ended |
|---|---|
|
Dec. 31, 2024
CAD ($)
| |
| Wataynikaneyap Power | |
| Other Commitments [Line Items] | |
| Equity capital contribution | $ 137,000,000 |
| Equity investment ownership (percent) | 39.00% |
| Wataynikaneyap Power | Minimum | |
| Other Commitments [Line Items] | |
| Equity capital contribution | $ 165,000,000 |
| Wataynikaneyap Power | Maximum | |
| Other Commitments [Line Items] | |
| Equity capital contribution | 235,000,000 |
| UNS Energy | Payment Guarantee | |
| Other Commitments [Line Items] | |
| Maximum commitment | 360,000,000 |
| Obligation under guarantee | $ 0 |