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Post-Employment Obligation - Summary of Independent Actuaries Estimate for the Expense Amount (Detail) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of defined benefit plans [line items]      
Current service cost R$ 15 R$ 19 R$ 17
Interest on the actuarial obligation 1,161 1,246 1,263
Estimated total expense in 2019 as per actuarial report 705 390 781
Pension plans and retirement supplement plans [member]      
Disclosure of defined benefit plans [line items]      
Estimated total expense in 2019 as per actuarial report 87 374 274
Health plan [member]      
Disclosure of defined benefit plans [line items]      
Current service cost 10 11 9
Interest on the actuarial obligation 172 178 173
Estimated total expense in 2019 as per actuarial report 470 22 305
Dental plan [member]      
Disclosure of defined benefit plans [line items]      
Current service cost 0    
Interest on the actuarial obligation 4 3 4
Estimated total expense in 2019 as per actuarial report 8 (1) 6
Life insurance [member]      
Disclosure of defined benefit plans [line items]      
Estimated total expense in 2019 as per actuarial report R$ 140 (5) R$ 196
2017 business year [Member]      
Disclosure of defined benefit plans [line items]      
Current service cost   18  
Interest on the actuarial obligation   1,228  
Expected return on the assets of the Plan   (782)  
Estimated total expense in 2019 as per actuarial report   464  
2017 business year [Member] | Pension plans and retirement supplement plans [member]      
Disclosure of defined benefit plans [line items]      
Current service cost   1  
Interest on the actuarial obligation   978  
Expected return on the assets of the Plan   (782)  
Estimated total expense in 2019 as per actuarial report   197  
2017 business year [Member] | Health plan [member]      
Disclosure of defined benefit plans [line items]      
Current service cost   14  
Interest on the actuarial obligation   208  
Estimated total expense in 2019 as per actuarial report   222  
2017 business year [Member] | Dental plan [member]      
Disclosure of defined benefit plans [line items]      
Interest on the actuarial obligation   4  
Estimated total expense in 2019 as per actuarial report   4  
2017 business year [Member] | Life insurance [member]      
Disclosure of defined benefit plans [line items]      
Current service cost   3  
Interest on the actuarial obligation   38  
Estimated total expense in 2019 as per actuarial report   R$ 41