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LEASES - Supplemental Information Related to Operating Leases (Details) - CNY (¥)
¥ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Lease cost:    
Operating fixed lease cost ¥ 3,964 ¥ 3,094
- Amortization of ROU assets 74  
- Interest on lease liabilities 90  
Short term lease cost 0 0
Variable lease cost   10
Variable lease cost 171  
Total lease cost ¥ 3,957 ¥ 3,104
Other information:    
Weighted average remaining lease term, Operating leases 14 years 11 years
Weighted average remaining lease term, Finance leases 29 years  
Weighted average discount rate, Operating leases 6.23% 7.34%
Weighted average discount rate, Finance leases 3.96%