23 Post-employment benefits (Details 7) - BRL (R$) R$ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Actuarial Obligations [Roll Forward]
Present value of net actuarial obligations, beginning balance	R$ 9,201,030
Present value of net actuarial obligations, ending balance	11,074,608	R$ 9,201,030
Unified Plan [Member]
Actuarial Obligations [Roll Forward]
Present value of net actuarial obligations, beginning balance	5,914,764	5,352,894	R$ 4,951,078
Cost of services	560	589	329
Cost of interest	477,732	533,201	563,257
Benefits paid	(435,454)	(414,256)	(406,023)
Actuarial (gain) losses	680,860	442,336	244,253
Present value of net actuarial obligations, ending balance	6,638,462	5,914,764	5,352,894
Plan III [Member]
Actuarial Obligations [Roll Forward]
Present value of net actuarial obligations, beginning balance	2,145,661	1,734,568	1,565,121
Cost of services	4,098	9,604	10,502
Cost of interest	128,075	195,991	176,878
Benefits paid	(174,427)	(133,281)	(122,841)
Actuarial (gain) losses	943,129	338,779	104,908
Present value of net actuarial obligations, ending balance	3,046,536	2,145,661	1,734,568
Assistance Plan [Member]
Actuarial Obligations [Roll Forward]
Present value of net actuarial obligations, beginning balance	1,140,605	1,035,957	933,914
Cost of services	14,306	11,633	9,225
Cost of interest	106,004	102,916	105,987
Benefits paid	(30)	(7)	(7)
Actuarial (gain) losses	128,725	(9,894)	(13,162)
Present value of net actuarial obligations, ending balance	R$ 1,389,610	R$ 1,140,605	R$ 1,035,957

The amount refers to actuarial obligations roll forward.

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- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from employee benefits paid in the current period.

+ References

No definition available.

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- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from employee service in the current period. [Refer: Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The decrease (increase) in a net defined benefit liability (asset) resulting from the remeasurement of that net defined benefit liability (asset). [Refer: Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from the passage of time. [Refer: Interest expense; Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]]

+ References

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