cm:Concept: us-gaap:LiabilitiesSubjectToCompromisePaymentsUnderBankruptcyCourtOrderForOtherLiabilities
| Liabilities Subject to Compromise, Payments under Bankruptcy Court Order for Other Liabilities |
| us-gaap:LiabilitiesSubjectToCompromisePaymentsUnderBankruptcyCourtOrderForOtherLiabilities |
| Amount of cash outflow to creditors related to liabilities subject to compromise pursuant to bankruptcy court orders for liabilities classified as other. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| For Period (duration) |
| Credit |
| false |
| us-gaap:LiabilitiesSubjectToCompromisePaymentsUnderBankruptcyCourtOrderForOtherLiabilities |