v3.25.1

Subsequent events - (Details) - Subsequent event $ / shares in Units, ¥ in Millions, $ in Millions	3 Months Ended	12 Months Ended
	Mar. 17, 2025 USD ($) $ / shares	Dec. 31, 2027 CNY (¥)	Dec. 31, 2026 CNY (¥)
O 2025 A Dividends
Subsequent Event [Line Items]
Dividend Declared date	Mar. 17, 2025
Dividend declared per share | $ / shares	$ 1.47
Dividends payable, Record date	Jun. 17, 2025
Cash dividends | $	$ 340
Dividend payment date	Jun. 30, 2025
Forecast | Minimum | O 2026 A Dividends
Subsequent Event [Line Items]
Cash dividends | ¥			¥ 30
Forecast | Minimum | O 2027 A Dividends
Subsequent Event [Line Items]
Cash dividends | ¥		¥ 30
American Depository Shares | O 2025 A Dividends
Subsequent Event [Line Items]
Dividend declared per share | $ / shares	$ 1.47

X

- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-SubTopic 10
-Name Accounting Standards Codification
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- Definition

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
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- Definition

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
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- Definition

Date the dividend to be paid was declared, in YYYY-MM-DD format.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-Publisher FASB
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- Definition

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+ References

No definition available.

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 830
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481674/830-30-50-2

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-Topic 855
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
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