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EMPLOYEE BENEFIT PLANS - Net periodic benefit cost recognized (Details) - CNY (¥) ¥ in Millions	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Pension benefits
EMPLOYEE BENEFIT PLANS
Service cost	¥ 6	¥ 8
Interest cost	1	2
Expected return on plan assets	0	0
Amortization of net loss	4	3
Regular Net Periodic Pension Cost	11	13
Total Recognized in Net Periodic Pension Cost	11	13
Other benefits
EMPLOYEE BENEFIT PLANS
Service cost	0	0
Regular Net Periodic Pension Cost	0	0
Total Recognized in Net Periodic Pension Cost	¥ 0	¥ 0

X

- Definition

Amount of gain (loss), recognized immediately as component of net periodic benefit (cost) credit, for change in value of benefit obligation or plan assets from experience different from that assumed, change in actuarial assumption, or consequence of temporarily deviating from substantive plan. Includes, but is not limited to, amount in excess of 10 percent of greater of fair value of plan assets or benefit obligation.

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Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan.

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Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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