Leases - Operating and Finance Lease Balance Sheet Location (Details) - CAD ($) $ in Millions |
Dec. 31, 2024 |
Dec. 31, 2023 |
|---|---|---|
| Operating leases | ||
| Other assets | $ 64 | $ 51 |
| Accounts payable and other current liabilities | (17) | (12) |
| Other liabilities | (47) | (39) |
| Finance leases | ||
| Accounts payable and other current liabilities | (4) | (3) |
| Finance leases | $ (343) | $ (339) |
| Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] | Other assets (Note 9) | Other assets (Note 9) |
| Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] | Accounts payable and other current liabilities (Note 13) | Accounts payable and other current liabilities (Note 13) |
| Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] | Other Liabilities, Noncurrent | Other Liabilities, Noncurrent |
| Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] | Public Utilities, Property, Plant and Equipment, Net, Regulatory assets (Note 8), Long-term regulatory assets | Public Utilities, Property, Plant and Equipment, Net, Regulatory assets (Note 8), Long-term regulatory assets |
| Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] | Accounts payable and other current liabilities (Note 13) | Accounts payable and other current liabilities (Note 13) |
| Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] | Finance leases | Finance leases |
| Regulatory assets | ||
| Finance leases | ||
| Finance lease assets | $ 142 | $ 137 |
| PPE, net | ||
| Finance leases | ||
| Finance lease assets | $ 205 | $ 205 |