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OTHER EQUITY INSTRUMENTS (Details)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 02, 2020
CNY (¥)
Nov. 19, 2019
CNY (¥)
Oct. 19, 2018
CNY (¥)
Oct. 31, 2016
USD ($)
Oct. 31, 2016
CNY (¥)
Oct. 27, 2015
CNY (¥)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
OTHER EQUITY INSTRUMENTS                    
Proceeds from issuance of perpetual securities             $ 153,257 ¥ 1,000,000 ¥ 1,500,000 ¥ 1,988,000
Repayments for short-term and long term loans             $ 6,607,120 ¥ 43,111,460 ¥ 66,105,388 ¥ 70,560,667
2015 Perpetual Medium-term Notes                    
OTHER EQUITY INSTRUMENTS                    
Notional amount           ¥ 2,000,000        
Interest rate (as a percent)           5.50%        
Proceeds from issuance of perpetual securities           ¥ 2,000,000        
2018 Perpetual Medium-term Notes                    
OTHER EQUITY INSTRUMENTS                    
Notional amount     ¥ 2,000,000              
Interest rate (as a percent)     5.10%              
Proceeds from Medium-term Notes     ¥ 2,000,000              
Initial spread (as a percent)     2.61%              
2018 Perpetual Medium-term Notes | Maximum                    
OTHER EQUITY INSTRUMENTS                    
Margin rate (as a percent)     5.00%              
Margin rate term (in years)     5 years              
2019 Perpetual Medium-term Notes                    
OTHER EQUITY INSTRUMENTS                    
Notional amount   ¥ 1,500,000                
Interest rate (as a percent)   4.20%                
Proceeds from Medium-term Notes   ¥ 1,499,000                
Initial spread (as a percent)   1.31%                
2019 Perpetual Medium-term Notes | Maximum                    
OTHER EQUITY INSTRUMENTS                    
Margin rate (as a percent)   3.00%                
Margin rate term (in years)   5 years                
2020 Perpetual Medium-term Notes                    
OTHER EQUITY INSTRUMENTS                    
Notional amount ¥ 1,000,000                  
Interest rate (as a percent) 4.45%                  
Proceeds from issuance of perpetual securities ¥ 1,000,000                  
2020 Perpetual Medium-term Notes | Maximum                    
OTHER EQUITY INSTRUMENTS                    
Initial spread (as a percent) 1.42%                  
Margin rate (as a percent) 3.00%                  
Margin rate term (in years) 2 years                  
Chalco Hong Kong | 2016 Senior Perpetual Securities                    
OTHER EQUITY INSTRUMENTS                    
Notional amount | $       $ 500,000            
Interest rate (as a percent)       4.25%            
Proceeds from issuance of perpetual securities       $ 498,000 ¥ 3,374,000          
Initial spread (as a percent)       2.931%            
Margin rate (as a percent)       5.00%