| Financial item | 
						   December 2023 | 
                        December 2022 | 
                        December 2021 | 
                     
                       
                      
                        | Amount | 
                        Composition cost | 
                        Increase / decrease rate | 
                        Amount | 
                        Composition cost | 
                        Increase / decrease rate | 
                        Amount | 
                        Composition cost | 
                        Increase / decrease rate | 
                       
                      
                        | Current assets (total) | 
             		 37,266 | 
                        38.5 | 
                        -26.3 | 
                        50,592 | 
                        52.6 | 
                        -8.0 | 
						54,998 | 
                        59.2 | 
                        -26.8 | 
                        
                  
                       
                      
                        | Non-current assets (total) | 
				59,549 | 
                        61.5 | 
                        30.5  | 
						45,620 | 
                        47.4 | 
                        20.5 | 
					    37,869 | 
                        40.8 | 
                        0.8 | 
                     
       
                       
                      
                        | Total assets | 
						96,815 | 
                        100 | 
                        0.6 | 
						
						96,212 | 
                        100 | 
                        3.6 | 
						92,867 | 
                        100 | 
                        -17.6 | 
            
                       
                      
                        | Current liabilities (total) | 
							24,188 | 
                        25 | 
                        47.9 | 
						
						16,353 | 
                        17.0 | 
                        -43.0 | 
						28,704 | 
                        30.9 | 
                        -46.5 | 
              
                       
                      
                        | Non-current liabilities (total) | 
						17,042 | 
                        17.6 | 
                        -9.4 | 
						
						18,815 | 
                        19.6 | 
                        220.5 | 
						5,871 | 
                        6.3 | 
                        -13.7 | 
                      
                       
                      
                        | Total Debt | 
						41,230 | 
                        42.6 | 
                        17.2  | 
						35,168 | 
                        36.6 | 
                        1.7 | 
						34,575 | 
                        37.2 | 
                        -42.8 | 
                    
                       
                      
                        | Capital | 
							5,730 | 
                        5.9 | 
                        0 | 
						
						5,731 | 
                        6.0 | 
                        0 | 
						5,730 | 
                        6.2 | 
                        0 | 
                     
   
                       
                      
                        | Capital surplus | 
								26,485 | 
                        27.4 | 
                        0 | 
						
						26,485 | 
                        27.5 | 
                        0 | 
						26,485 | 
                        28.5 | 
                        1.4 | 
                      
                       
                      
                        | Retained earnings | 
							20,690 | 
                        21.4 | 
                        -20.8 | 						
						
						
						26,139 | 
                        27.2 | 
                        0.3 | 
						26,052 | 
                        28.1 | 
                        26.2 | 
                        
                             
                      
                        | Total amount of capital | 
						55,585 | 
                        57.4 | 
                        -8.9 | 						
						
						61,044 | 
                        63.4 | 
                        4.7 | 
						58,292 | 
                        62.8 | 
                        11.5 | 
                        
                                             
                      |