cm:Concept: us-gaap:DerivativeInstrumentsAndHedgesLiabilities
| Derivative Instruments and Hedges, Liabilities |
| us-gaap:DerivativeInstrumentsAndHedgesLiabilities |
| Sum as of the balance sheet date of the (a) fair values of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, and (b) the carrying amounts of the liabilities arising from financial instruments or contracts used to mitigate a specified risk (hedge), and which are expected to be extinguished or otherwise disposed of within a year or the normal operating cycle, if longer, net of the effects of master netting arrangements. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| As Of (instant) |
| Credit |
| false |
| us-gaap:DerivativeInstrumentsAndHedgesLiabilities |