cm:Concept: us-gaap:FinancialInstrumentsOwnedAndPledgedAsCollateralAtFairValue
| Financial Instruments, Owned and Pledged as Collateral, at Fair Value |
| us-gaap:FinancialInstrumentsOwnedAndPledgedAsCollateralAtFairValue |
| The fair value as of the balance sheet date of financial instruments and other positions owned by the entity and pledged to counterparties as collateral, including: (1) mortgages, mortgage-backed and asset backed securities; (2) US government and agency obligations; (3) state and municipal government obligations; (4) other sovereign government debt; (5) corporate obligations; (6) corporate equities; (7) principal investments; (8) derivative contracts; and (9) physical commodities. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| As Of (instant) |
| Debit |
| false |
| us-gaap:FinancialInstrumentsOwnedAndPledgedAsCollateralAtFairValue |