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Statements of Changes in Equity - BRL (R$)
R$ in Thousands
Issued capital [member]
Statutory reserve [member]
Investment Reserve [Member]
Additional Dividend Proposed [Member]
Retained earnings [member]
Accumulated other comprehensive income [member]
Total [Member]
Beginning balance, value at Dec. 31, 2019 R$ 15,000,000 R$ 1,368,406 R$ 6,098,575 R$ 80,973 R$ (912,171) R$ 21,635,783
IfrsStatementLineItems [Line Items]              
   Net income for the year 973,318 973,318
   Actuarial gains (losses) 511,169 511,169
   Total comprehensive income for the year 973,318 511,169 1,484,487
   Legal Reserve 48,666 (48,666)
   Interest on capital (R$1.08455 per share) (231,163) (231,163)
   Complementary minimum dividends of 2021, approved (R$0.08139 per share) (80,973) (80,973)
   Complementary minimum dividends (R$ 0.19145 per share) 40,806 (40,806)
   Withholding income tax on interest on capital attributable as minimum mandatory dividends (14,430) (14,430)
   Transfer to investments reserve 652,683 (652,683)
Ending balance, value at Dec. 31, 2020 15,000,000 1,417,072 6,751,258 26,376 (401,002) 22,793,704
IfrsStatementLineItems [Line Items]              
   Net income for the year 2,305,869 2,305,869
   Actuarial gains (losses) 447,376 447,376
   Total comprehensive income for the year 2,305,869 447,376 2,753,245
   Legal Reserve 115,293 (115,293)
   Interest on capital (R$1.08455 per share) (547,645) (547,645)
   Complementary minimum dividends of 2021, approved (R$0.08139 per share) (26,376) (26,376)
   Complementary minimum dividends (R$ 0.19145 per share) 96,700 (96,700)
   Withholding income tax on interest on capital attributable as minimum mandatory dividends (41,069) (41,069)
   Transfer to investments reserve 1,546,231 (1,546,231)
Ending balance, value at Dec. 31, 2021 15,000,000 1,532,365 8,297,489 55,631 46,374 24,931,859
IfrsStatementLineItems [Line Items]              
   Net income for the year 3,121,267 3,121,267
   Actuarial gains (losses) 131,269 131,269
   Total comprehensive income for the year 3,121,267 131,269 3,252,536
   Legal Reserve 156,063 (156,063)
   Interest on capital (R$1.08455 per share) (741,301) (741,301)
   Complementary minimum dividends of 2021, approved (R$0.08139 per share) (55,631) (55,631)
   Complementary minimum dividends (R$ 0.19145 per share) 130,857 (130,857)
   Withholding income tax on interest on capital attributable as minimum mandatory dividends (53,930) (53,930)
   Transfer to investments reserve 2,093,046 (2,093,046)
Ending balance, value at Dec. 31, 2022 R$ 15,000,000 R$ 1,688,428 R$ 10,390,535 R$ 76,927 R$ 177,643 R$ 27,333,533