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Post-Employment Obligation - Summary of Expectation for Payment of Benefits (Detail)
R$ in Millions
 12 Months Ended
Dec. 31, 2018
BRL (R$)
Disclosure of defined benefit plans [line items]  
Estimated payment of benefits R$ 1,010
Pension plans and retirement supplement plans [member]  
Disclosure of defined benefit plans [line items]  
Estimated payment of benefits 863
Health plan [member]  
Disclosure of defined benefit plans [line items]  
Estimated payment of benefits 127
Dental plan [member]  
Disclosure of defined benefit plans [line items]  
Estimated payment of benefits 3
Life insurance [member]  
Disclosure of defined benefit plans [line items]  
Estimated payment of benefits R$ 17