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26. POST-EMPLOYMENT OBLIGATIONS (Details 11)
R$ in Millions
Dec. 31, 2019
BRL (R$)
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Reduction of one year in the mortality table R$ 405
Increase of one year in the mortality table (382)
Reduction of 1% in the discount rate 2,211
Pension And Retirement Supplement Plans [Member]  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Reduction of one year in the mortality table 335
Increase of one year in the mortality table (336)
Reduction of 1% in the discount rate 1,583
Health Plan [Member]  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Reduction of one year in the mortality table 84
Increase of one year in the mortality table (61)
Reduction of 1% in the discount rate 496
Dental Plan [Member]  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Reduction of one year in the mortality table 1
Increase of one year in the mortality table (1)
Reduction of 1% in the discount rate 10
Life Insurance Plan [Member]  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Reduction of one year in the mortality table (15)
Increase of one year in the mortality table 16
Reduction of 1% in the discount rate R$ 122