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The calculation of basic and diluted earnings per share is as follows: (Details) - BRL (R$)
R$ / shares in Units, R$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
IfrsStatementLineItems [Line Items]      
Net income for the year attributed to equity holders of the parent R$ 3,751 R$ 2,864 R$ 3,194
Minimum mandatory dividend from net income for the year - preferred shares 1,309 986 509
Net income for the year not distributed - preferred shares 1,188 920 1,617
Total earnings - preferred shares (A) 2,497 1,906 2,126
Minimum mandatory dividend from net income for the year - common shares 657 496 256
Net income for the year not distributed - common shares 597 462 812
Total earnings - common shares (B) R$ 1,254 R$ 958 R$ 1,068
Basic and diluted earnings from continuing operations per preferred share (A.1 / number of preferred shares) R$ 1.70 R$ 1.30 R$ 1.45
Basic and diluted earnings from continuing operations per common share (B.1 / number of common shares) 1.70 1.30 1.45
Continuing Operations Of Shareholder [Member]      
IfrsStatementLineItems [Line Items]      
Basic and diluted earnings from continuing operations per preferred share (A.1 / number of preferred shares) 1.70 1.30 1.35
Basic and diluted earnings from continuing operations per common share (B.1 / number of common shares) R$ 1.70 R$ 1.30 R$ 1.35
Net income for the year from continuing operations attributed to equity holders of the parent R$ 3,751 R$ 2,864 R$ 2,970
Minimum mandatory dividend from net income for the year from continuing operations – preferred shares 1,309 986 509
Net income for the year from continuing operations not distributed – preferred shares 1,188 920 1,468
Total earnings from continuing operations - preferred shares (A.1) 2,497 1,906 1,977
Minimum mandatory dividend from net income for the year from continuing operations - common shares 657 496 256
Net income for the year from continuing operations not distributed – common shares 597 462 737
Total earnings from continuing operations - common shares (B.1) R$ 1,254 R$ 958 R$ 993