cm:Concept: us-gaap:InterestAndFeeIncomeLoansForeign
| Interest and Fee Income, Loans, Foreign |
| us-gaap:InterestAndFeeIncomeLoansForeign |
| Interest and fee income generated by commercial and consumer loans, made by foreign branches of the reporting entity, which may include loans to foreign governments, foreign banks and other financial institutions, commercial and industrial entities, and citizens of not domiciled in the same country as the reporting entity. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| For Period (duration) |
| Credit |
| false |
| us-gaap:InterestAndFeeIncomeLoansForeign |