cm:Member: us-gaap:FairValueOptionOtherEligibleItemsMember
| Fair Value Option, Other Eligible Items [Member] |
| us-gaap:FairValueOptionOtherEligibleItemsMember |
| This element embodies certain items identified as eligible for the fair value option that are not within the definition of financial assets and liabilities. Such items may consist of: (a) a firm commitment that would otherwise not be recognized at inception and that involves only financial instruments (for example, a forward purchase contract for a loan that is not readily convertible to cash. That commitment involves only financial instruments-a loan and cash-and would not otherwise be recognized because it is not a derivative instrument; (b) a written loan commitment; (c) the rights and obligations under an insurance contract that is not a financial instrument (because it requires or permits the insurer to provide goods or services rather than a cash settlement), but whose terms permit the insurer to settle by paying a third party to provide those goods or services; (d) the rights and obligations under a warranty that is not a financial instrument (because it requires or permits the warrantor to provide goods or services rather than a cash settlement) but whose terms permit the warrantor to settle by paying a third party to provide those goods or services; and (e) a host financial instrument resulting from the separation of an embedded nonfinancial derivative instrument from a nonfinancial hybrid instrument (for example, an instrument in which the value of the bifurcated embedded derivative is payable in cash, services, or merchandise but the debt host is payable only in cash). |
| cm:Member |
| [Member] (nonnum:domainItemType) |
| For Period (duration) |
| (no balance type) |
| true |
| us-gaap:FairValueOptionOtherEligibleItemsMember |