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Post-Employment Obligation - Summary of Fair Value of Pension Plan Assets Issued by Sponsor and Subsidiaries (Detail) - BRL (R$)
R$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of fair value of plan assets [line items]    
Assets of the pension plan R$ 1,077 R$ 1,098
Non-convertible debentures issued by the Company and subsidiaries [member]    
Disclosure of fair value of plan assets [line items]    
Assets of the pension plan 380 363
Shares issued by the Company [member]    
Disclosure of fair value of plan assets [line items]    
Assets of the pension plan 35 10
Real estate properties of the Foundation, occupied by the Company and subsidiaries [member]    
Disclosure of fair value of plan assets [line items]    
Assets of the pension plan R$ 662 R$ 725