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26. POST-EMPLOYMENT OBLIGATIONS (Details 4) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of defined benefit plans [line items]      
Current liabilities R$ 288 R$ 253  
Non-currentliabilities 6,421 4,736  
Net liabilities, Beginning balance 4,989 4,186 R$ 4,242
Expense recognized in Statement of income 464 405 455
Contributions paid (343) (307) (282)
Plan amendment - Past service     (619)
Actuarial losses (gains) 2,775 903 537
Net liabilities, Ending balance 6,709 4,989 4,186
Pension And Retirement Supplement Plans [Member]      
Disclosure of defined benefit plans [line items]      
Net liabilities, Beginning balance 2,170 2,068 1,679
Expense recognized in Statement of income 197 193 175
Contributions paid (200) (178) (160)
Plan amendment - Past service    
Actuarial losses (gains) 805 87 374
Net liabilities, Ending balance 2,972 2,170 2,068
Health Plan [Member]      
Disclosure of defined benefit plans [line items]      
Net liabilities, Beginning balance 2,344 1,809 1,711
Expense recognized in Statement of income 222 183 189
Contributions paid (131) (118) (113)
Plan amendment - Past service    
Actuarial losses (gains) 576 402 66
Net liabilities, Ending balance 3,102 2,344 1,809
Dental Plan [Member]      
Disclosure of defined benefit plans [line items]      
Net liabilities, Beginning balance 48 38 38
Expense recognized in Statement of income 5 4 3
Contributions paid (2) (2) (2)
Plan amendment - Past service    
Actuarial losses (gains) 11 8 2
Net liabilities, Ending balance 61 48 38
Life Insurance Plan [Member]      
Disclosure of defined benefit plans [line items]      
Net liabilities, Beginning balance 427 271 814
Expense recognized in Statement of income 40 25 88
Contributions paid (10) (9) (7)
Plan amendment - Past service     (619)
Actuarial losses (gains) 130 26 55
Net liabilities, Ending balance R$ 574 R$ 427 R$ 271