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Post-Employment Obligation - Summary of Sensitivity Analysis of the Effects of Changes in the Principal Actuarial Assumptions Used to Determine the Defined-benefit Obligation (Detail)
R$ in Millions
Dec. 31, 2018
BRL (R$)
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Reduction of one year in the mortality table R$ 260
Increase of one year in the mortality table (263)
Reduction of 1% in the discount rate 1,595
Pension plans and retirement supplement plans [member]  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Reduction of one year in the mortality table 229
Increase of one year in the mortality table (233)
Reduction of 1% in the discount rate 1,183
Health plan [member]  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Reduction of one year in the mortality table 45
Increase of one year in the mortality table (45)
Reduction of 1% in the discount rate 327
Dental plan [member]  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Reduction of one year in the mortality table 1
Increase of one year in the mortality table (1)
Reduction of 1% in the discount rate 7
Life insurance [member]  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Reduction of one year in the mortality table (15)
Increase of one year in the mortality table 16
Reduction of 1% in the discount rate R$ 78