cm:Concept: us-gaap:RepaymentsOfAdvancesForConstruction
| Repayments of Advances for Construction |
| us-gaap:RepaymentsOfAdvancesForConstruction |
| The cash outflow for the payments made by the entity, generally on a straight-line basis over periods ranging from five to forty years to developers, builders, government agencies and municipalities for borrowings received in construction. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| For Period (duration) |
| Credit |
| false |
| us-gaap:RepaymentsOfAdvancesForConstruction |