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24. POST-EMPLOYMENT OBLIGATIONS (Details 4) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of defined benefit plans [line items]      
Net liabilities, Beginning balance R$ 6,709 R$ 4,989 R$ 4,186
Expense recognized in Statement of income 491 464 405
Contributions paid (367) (343) (307)
Actuarial losses (gains) 10 1,599 705
Net liabilities, Ending balance 6,843 6,709 4,989
Current liabilities 305 288 [1]  
Non-currentliabilities 6,538 6,421 [1]  
Pension plans and retirement supplement plans [member]      
Disclosure of defined benefit plans [line items]      
Net liabilities, Beginning balance 2,972 2,170 2,068
Expense recognized in Statement of income 206 197 193
Contributions paid (211) (200) (178)
Actuarial losses (gains) (58) 805 87
Net liabilities, Ending balance 2,909 2,972 2,170
Health plan [member]      
Disclosure of defined benefit plans [line items]      
Net liabilities, Beginning balance 3,102 2,344 1,809
Expense recognized in Statement of income 236 222 183
Contributions paid (143) (131) (118)
Actuarial losses (gains) 124 667 402
Net liabilities, Ending balance 3,319 3,102 2,344
Dental plan [member]      
Disclosure of defined benefit plans [line items]      
Net liabilities, Beginning balance 61 48 38
Expense recognized in Statement of income 5 5 4
Contributions paid (3) (2) (2)
Actuarial losses (gains) 1 10 8
Net liabilities, Ending balance 64 61 48
Life insurance plan [member]      
Disclosure of defined benefit plans [line items]      
Net liabilities, Beginning balance 574 427 271
Expense recognized in Statement of income 44 40 25
Contributions paid (10) (10) (9)
Actuarial losses (gains) (57) 117 140
Net liabilities, Ending balance R$ 551 R$ 574 R$ 427
[1] See note 2.8.