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23 Post-employment benefits (Details 8) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of defined benefit plans [line items]      
Fair value of the plan's assets, ending balance R$ 10,880,721 R$ 8,642,068  
Unified Plan [Member]      
Disclosure of defined benefit plans [line items]      
Fair value of the plan's assets, beginning balance 6,290,841 5,834,572 R$ 5,478,802
Return estimated for assets 685,685 593,572 546,699
Contributions and distributions 23,851 24,011 30,520
Benefits paid (435,454) (414,256) (406,023)
Actuarial gain (losses) 981,833 252,942 184,574
Fair value of the plan's assets, ending balance 7,546,756 6,290,841 5,834,572
Plan III [Member]      
Disclosure of defined benefit plans [line items]      
Fair value of the plan's assets, beginning balance 2,178,236 1,821,055 1,793,516
Return estimated for assets 337,476 230,703 202,691
Contributions and distributions 4,185 9,184 10,505
Benefits paid (174,427) (133,281) (122,841)
Actuarial gain (losses) 792,284 250,575 (62,816)
Fair value of the plan's assets, ending balance 3,137,754 2,178,236 1,821,055
Assistance Plan [Member]      
Disclosure of defined benefit plans [line items]      
Fair value of the plan's assets, beginning balance 172,991 170,923 165,301
Return estimated for assets 51,541 16,579 23,934
Contributions and distributions
Benefits paid
Actuarial gain (losses) (28,321) (14,511) (18,312)
Fair value of the plan's assets, ending balance R$ 196,211 R$ 172,991 R$ 170,923