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v3.21.2

Service Providers and Related Party Agreements - Additional Information (Detail) | 6 Months Ended
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Jun. 30, 2021
Sponsor | Accrued Professional Fees |
Related Party Transaction [Line Items] |
Sponsor's fee accrues daily and paid monthly, annual nominal Rate | 0.40%

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Identify the stated interest rate per the agreement, for example, leasing and debt arrangements between related parties. + References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=fxc_SponsorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RelatedPartyTransactionAxis=fxc_AccruedProfessionalFeesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |