cm:Concept: us-gaap:IncreaseDecreaseInAllowanceForEquityFundsUsedDuringConstruction
| Increase (Decrease) in Allowance for Equity Funds Used During Construction |
| us-gaap:IncreaseDecreaseInAllowanceForEquityFundsUsedDuringConstruction |
| The increase (decrease) during the reporting period in the capitalized cost of equity (based on assumed rate of return) and / or borrowed funds (based on interest rate) used to finance construction of regulated assets, which is expected to be recovered through rate adjustments. As a result of this capitalization, net income is increased. This element pertains to certain regulated industries, such as public utilities. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| For Period (duration) |
| Credit |
| false |
| us-gaap:IncreaseDecreaseInAllowanceForEquityFundsUsedDuringConstruction |