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Related Party Agreements - Additional Information (Detail) - Sponsor [Member]	3 Months Ended
	Mar. 31, 2019 USD ($)
Accrued Professional Fees [Member]
Related Party Transaction [Line Items]
Sponsor's fee accrues daily and paid monthly, annual nominal Rate	0.40%
Professional Fees Liability [Member]
Related Party Transaction [Line Items]
Legal fees and expenses assumed	$ 100,000
Excess amount of assumed audit fees and legal expenses	$ 100,000

X

- Definition

Legal fees and expenses assumed sponsor.

+ References

No definition available.

+ Details

Name:	fxa_MaximumThresholdAnnualAmountOfPaymentsLegalFeesAndExpenses
Namespace Prefix:	fxa_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Represents the minimum threshold for legal fees and expenses.

+ References

No definition available.

+ Details

Name:	fxa_MinimumThresholdExcessAnnualAmountOfPaymentsLegalFeesAndExpenses
Namespace Prefix:	fxa_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- 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

X

- 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

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=fxa_SponsorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=fxa_AccruedProfessionalFeesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=fxa_ProfessionalFeesLiabilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: