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SHORT-TERM INVESTMENTS - Held-to-maturity and available-for-sale debt investments (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2025 CNY (¥)	Dec. 31, 2025 USD ($)	Dec. 31, 2024 CNY (¥)
Held-to-maturity debt investments
Cost or amortized cost less allowance for credit losses	¥ 5,526,195		¥ 5,417,761
Available-for-sale debt investments
Available-for-sale debt investments	5,370,207		¥ 551,348
Short-term investment
Held-to-maturity debt investments
Cost or amortized cost less allowance for credit losses	5,526,195
Gross unrecognized holding gains	3,176
Gross unrealized holding losses	(75,405)
Fair value	5,453,966	$ 779,907
Available-for-sale debt investments
Cost or amortized cost less allowance for credit losses	5,405,275
Gross unrecognized holding gains	0
Gross unrecognized holding losses	(35,068)
Available-for-sale debt investments	¥ 5,370,207	$ 767,929

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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