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INCOME TAXES (Details) - CNY (¥)
¥ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Income tax                            
Effective tax rate (as a percent)   25.00% 25.00% 25.00%                    
Cash dividends paid     ¥ 678 ¥ 660                    
Income (loss) before income taxes                            
Total   ¥ (2,279) ¥ 2,565 ¥ 1,393                    
Minimum                            
Income tax                            
Extended limitation tax evasion period   5 years                        
Maximum                            
Income tax                            
Extended limitation tax evasion period   10 years                        
China                            
Income tax                            
Effective tax rate (as a percent)   25.00% 25.00% 25.00% 25.00% 25.00% 25.00% 25.00% 25.00% 25.00% 25.00% 25.00% 25.00% 25.00%
Income (loss) before income taxes                            
PRC including Hong Kong and Taiwan   ¥ (392) ¥ 2,334 ¥ 1,583                    
GERMANY                            
Income tax                            
Effective tax rate (as a percent)   15.00%                        
Effective income tax rate including solidarity surcharge   15.825%                        
Income (loss) before income taxes                            
Income taxes foreign   ¥ (1,606)                        
GERMANY | Minimum                            
Income tax                            
Municipal Trade Tax   7.00%                        
GERMANY | Maximum                            
Income tax                            
Municipal Trade Tax   17.00%                        
Others                            
Income (loss) before income taxes                            
Income taxes foreign   ¥ (281) ¥ 231 ¥ (190)                    
Jizhu Shanghai | China                            
Income tax                            
Effective tax rate (as a percent)   15.00% 15.00% 12.50% 12.50% 12.50%                
Income tax exemption period   2 years                        
Period of income tax rate reduction   3 years                        
Percentage of tax reduction   50.00%                        
Jiangsu Mengguang | China                            
Income tax                            
Effective tax rate (as a percent) 15.00% 15.00% 15.00%