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23 Post-employment benefits (Details 14) - shares
Dec. 31, 2019
Dec. 31, 2018
Unified Plan [Member]    
Disclosure of defined benefit plans [line items]    
Debentures
Shares 5
Defined benefit pension plan securities 5
Plan III [Member]    
Disclosure of defined benefit plans [line items]    
Debentures 4,166
Shares 13
Defined benefit pension plan securities 4,179