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Subsequent events (Details) ¥ in Millions, $ in Millions							1 Months Ended
	Mar. 08, 2022 USD ($)	Mar. 08, 2022 CNY (¥)	Mar. 08, 2022 USD ($)	Mar. 08, 2022 CNY (¥)	Feb. 09, 2022 USD ($)	Feb. 09, 2022 CNY (¥)	Jan. 17, 2022 USD ($)	Jan. 17, 2022 CNY (¥)	Mar. 08, 2022 CNY (¥)	Feb. 09, 2022 CNY (¥)	Jan. 17, 2022 CNY (¥)
Subsequent events (Details) [Line Items]
Maximum amount	$ 1.6	¥ 10
Bearing interest percentage	5.50%		5.50%						5.50%
short-term loans percentage	100.00%		100.00%						100.00%
Borrowed amount	$ 1.6		$ 1.6						¥ 10
Subsequent Event [Member]
Subsequent events (Details) [Line Items]
Maximum amount			$ 1.6	¥ 10	$ 1.6	¥ 10	$ 1.6	¥ 10
Bearing interest percentage	5.50%		5.50%		124.00%		105.00%		5.50%	124.00%	105.00%
short-term loans percentage	100.00%		100.00%		4.94%		3.85%		100.00%	4.94%	3.85%
Borrowed amount	$ 1.6		$ 1.6		$ 1.6		$ 1.6		¥ 10	¥ 10	¥ 10

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- Definition

Amount of eligible retained income multiplied by applicable maximum payout ratio as defined by regulatory framework.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
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- Definition

Percentage of interest-bearing domestic deposit liabilities to total deposit liabilities.

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- Definition

Amount of allowance for credit loss on security borrowed.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (f)
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
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- Definition

The portion of the carrying amount of short-term borrowings outstanding as of the balance sheet date which accrues interest at a set, unchanging rate.

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