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Japanese Yen Deposits - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2020 JPY (¥)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 JPY (¥)	Dec. 31, 2020 JPY (¥)	Dec. 31, 2019 JPY (¥)
Cash And Cash Equivalents [Abstract]
Proceeds from purchases of redeemable capital Shares	$ 237,050,278	¥ 24,652,512,877	$ 344,983,900	¥ 38,151,608,760
Principal redemptions	183,671,183	19,901,290,156	327,169,568	36,228,131,318
Withdrawals (to pay expenses)		¥ 153,028,653		¥ 119,473,200
Deposits, interest bearing	$ 247,053,789		$ 192,398,201		¥ 25,507,068,457	¥ 20,908,874,389
Annual nominal rate	(0.20%)				(0.20%)

X

- Definition

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation.

+ References

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- Definition

Rate of interest on investment.

+ References

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- Definition

Total amount of cash paid for operating activities during the current period.

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- Definition

The cash outflow for reacquisition of callable preferred stock.

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The cash inflow from issuance of preferred stock that is classified as callable.

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