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Post-Employment Benefits - Summary of Sensitivity of Defined Benefit Obligation (Detail)
R$ in Millions
Dec. 31, 2019
BRL (R$)
BD and CV Plans [member] | Actuarial assumption of interest rates [member] | Actuarial liabilities [member]  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Increase in assumptions R$ (977)
Decrease in assumptions 1,104
BD and CV Plans [member] | Actuarial assumption of interest rates [member] | Stockholders Equity [Member]  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Increase in assumptions 319
Decrease in assumptions (421)
BD and CV Plans [member] | Actuarial assumption of mortality rates [member] | Actuarial liabilities [member]  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Increase in assumptions (258)
Decrease in assumptions 357
BD and CV Plans [member] | Actuarial assumption of mortality rates [member] | Stockholders Equity [Member]  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Increase in assumptions 88
Decrease in assumptions (94)
Other post employment benefits [member] | Actuarial assumption of interest rates [member] | Actuarial liabilities [member]  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Increase in assumptions (36)
Decrease in assumptions 41
Other post employment benefits [member] | Actuarial assumption of interest rates [member] | Stockholders Equity [Member]  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Increase in assumptions 36
Decrease in assumptions (41)
Other post employment benefits [member] | Actuarial assumption of mortality rates [member] | Actuarial liabilities [member]  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Increase in assumptions (13)
Decrease in assumptions 17
Other post employment benefits [member] | Actuarial assumption of mortality rates [member] | Stockholders Equity [Member]  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Increase in assumptions 13
Decrease in assumptions (17)
Other post employment benefits [member] | Medical care cost [member] | Actuarial liabilities [member]  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Increase in assumptions 87
Decrease in assumptions (69)
Other post employment benefits [member] | Medical care cost [member] | Stockholders Equity [Member]  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Increase in assumptions (87)
Decrease in assumptions R$ 69