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Post-Employment Obligation - Summary of Changes in Net Liabilities (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 liabilities R$ 253 R$ 232  
Non-currentliabilities 4,736 3,954  
Net liabilities at December 31, 2015 4,186 4,242 R$ 3,253
Expense recognized in Statement of income 405 455 448
Contributions paid (307) (282) (240)
Plan amendment - Past service   (619)  
Actuarial losses (gains) 705 390 781
Net liabilities, Ending balance 4,989 4,186 4,242
Pension plans and retirement supplement plans [member]      
Disclosure of defined benefit plans [line items]      
Net liabilities at December 31, 2015 2,068 1,679 1,346
Expense recognized in Statement of income 193 175 187
Contributions paid (178) (160) (128)
Actuarial losses (gains) 87 374 274
Net liabilities, Ending balance 2,170 2,068 1,679
Health plan [member]      
Disclosure of defined benefit plans [line items]      
Net liabilities at December 31, 2015 1,809 1,711 1,323
Expense recognized in Statement of income 183 189 182
Contributions paid (118) (113) (99)
Actuarial losses (gains) 470 22 305
Net liabilities, Ending balance 2,344 1,809 1,711
Dental plan [member]      
Disclosure of defined benefit plans [line items]      
Net liabilities at December 31, 2015 38 38 30
Expense recognized in Statement of income 4 3 4
Contributions paid (2) (2) (2)
Actuarial losses (gains) 8 (1) 6
Net liabilities, Ending balance 48 38 38
Life insurance [member]      
Disclosure of defined benefit plans [line items]      
Net liabilities at December 31, 2015 271 814 554
Expense recognized in Statement of income 25 88 75
Contributions paid (9) (7) (11)
Plan amendment - Past service   (619)  
Actuarial losses (gains) 140 (5) 196
Net liabilities, Ending balance R$ 427 R$ 271 R$ 814