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Post-Employment Benefits - Summary of Calculation of Net Amount Recognized in Balance Sheet, Corresponding to Defined Benefit Plan (Detail) - BRL (R$)
R$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of defined benefit plans [line items]    
Net assets of the plans R$ 22,732 R$ 18,808
4 - Net amount recognized in the balance sheet (1+2+3) (1,083) 34
Amount recognized in Assets (Note 18a) 717 731
Amount recognized in Liabilities (Note 18b) (1,800) (697)
Defined Benefit Plans and Variable Contribution And Other Post Employment Benefits Plans [Member]    
Disclosure of defined benefit plans [line items]    
Net assets of the plans 24,207 20,412
Actuarial liabilities [member]    
Disclosure of defined benefit plans [line items]    
Actuarial liabilities (20,680) (15,775)
Asset restriction [member]    
Disclosure of defined benefit plans [line items]    
Asset restriction (*) (4,610) (4,603)
BD and CV Plans [member]    
Disclosure of defined benefit plans [line items]    
4 - Net amount recognized in the balance sheet (1+2+3) (742) (349)
Amount recognized in Assets (Note 18a) 91 66
Amount recognized in Liabilities (Note 18b) (833) (415)
BD and CV Plans [member] | Defined Benefit Plans and Variable Contribution And Other Post Employment Benefits Plans [Member]    
Disclosure of defined benefit plans [line items]    
Net assets of the plans 22,732 18,808
BD and CV Plans [member] | Actuarial liabilities [member]    
Disclosure of defined benefit plans [line items]    
Actuarial liabilities (19,713) (15,493)
BD and CV Plans [member] | Asset restriction [member]    
Disclosure of defined benefit plans [line items]    
Asset restriction (*) (3,761) (3,664)
CD Plans [member]    
Disclosure of defined benefit plans [line items]    
4 - Net amount recognized in the balance sheet (1+2+3) 626 665
Amount recognized in Assets (Note 18a) 626 665
CD Plans [member] | Defined Benefit Plans and Variable Contribution And Other Post Employment Benefits Plans [Member]    
Disclosure of defined benefit plans [line items]    
Net assets of the plans 1,475 1,604
CD Plans [member] | Asset restriction [member]    
Disclosure of defined benefit plans [line items]    
Asset restriction (*) (849) (939)
Other post employment benefits [member]    
Disclosure of defined benefit plans [line items]    
4 - Net amount recognized in the balance sheet (1+2+3) (967) (282)
Amount recognized in Liabilities (Note 18b) (967) (282)
Other post employment benefits [member] | Actuarial liabilities [member]    
Disclosure of defined benefit plans [line items]    
Actuarial liabilities R$ (967) R$ (282)