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Post-Employment Obligations - Schedule of Consolidated Actuarial Information (Details) - BRL (R$)
R$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]        
Net liabilities in the statement of financial position R$ 5,417 R$ 5,693 R$ 6,205 R$ 6,843
Pension plans and retirement supplement plans [member]        
IfrsStatementLineItems [Line Items]        
Fair value of plan assets 9,882 9,198 9,378 10,420
Health plan [member]        
IfrsStatementLineItems [Line Items]        
Net liabilities in the statement of financial position 3,007 3,314 3,469 3,319
Dental plan [member]        
IfrsStatementLineItems [Line Items]        
Net liabilities in the statement of financial position 53 61 R$ 66 R$ 64
Actuarial assumption of expected rates of pension increases [member]        
IfrsStatementLineItems [Line Items]        
Present value of obligations 15,276 14,778    
Fair value of plan assets (9,882) (9,198)    
Net liabilities in the statement of financial position 5,417 5,692    
Actuarial assumption of expected rates of pension increases [member] | Initial net liabilities [member]        
IfrsStatementLineItems [Line Items]        
Net liabilities in the statement of financial position 5,394 5,580    
Actuarial assumption of expected rates of pension increases [member] | Effect of asset ceiling [member]        
IfrsStatementLineItems [Line Items]        
Net liabilities in the statement of financial position 23 112    
Actuarial assumption of expected rates of pension increases [member] | Pension plans and retirement supplement plans [member]        
IfrsStatementLineItems [Line Items]        
Present value of obligations 12,216 11,404    
Fair value of plan assets (9,882) (9,198)    
Net liabilities in the statement of financial position 2,357 2,318    
Actuarial assumption of expected rates of pension increases [member] | Pension plans and retirement supplement plans [member] | Initial net liabilities [member]        
IfrsStatementLineItems [Line Items]        
Net liabilities in the statement of financial position 2,334 2,206    
Actuarial assumption of expected rates of pension increases [member] | Pension plans and retirement supplement plans [member] | Effect of asset ceiling [member]        
IfrsStatementLineItems [Line Items]        
Net liabilities in the statement of financial position 23 112    
Actuarial assumption of expected rates of pension increases [member] | Health plan [member]        
IfrsStatementLineItems [Line Items]        
Present value of obligations 3,007 3,314    
Net liabilities in the statement of financial position 3,007 3,314    
Actuarial assumption of expected rates of pension increases [member] | Health plan [member] | Initial net liabilities [member]        
IfrsStatementLineItems [Line Items]        
Net liabilities in the statement of financial position 3,007 3,314    
Actuarial assumption of expected rates of pension increases [member] | Dental plan [member]        
IfrsStatementLineItems [Line Items]        
Present value of obligations 53 60    
Net liabilities in the statement of financial position 53 60    
Actuarial assumption of expected rates of pension increases [member] | Dental plan [member] | Initial net liabilities [member]        
IfrsStatementLineItems [Line Items]        
Net liabilities in the statement of financial position R$ 53 R$ 60