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Basis of Preparation - Summary of Impact of Adoption of IFRS 15 on Statement of Financial Position and Statement of Financial Position (Detail) - BRL (R$)
R$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of impact of adoption of IFRS 15 on financial statements [line items]        
Current assets R$ 27,796 R$ 8,537    
Concession financial assets 1,071 848    
Concession contract assets 131      
Other current assets 26,594      
Non-current assets 32,059 33,703    
Concession financial assets 4,927 6,605    
Concession contract assets 1,598      
Intangible assets 10,777 11,156 R$ 10,820 R$ 10,275
Other non-current assets 14,757      
Total assets 59,855 42,240    
Current liabilities 23,394 8,663    
Non-current liabilities 20,522 19,247    
Total liabilities 43,916 27,910    
Shareholders' equity 15,939 R$ 14,330 R$ 12,934 R$ 12,988
Without adoption of IFRS 15 [member]        
Disclosure of impact of adoption of IFRS 15 on financial statements [line items]        
Current assets 27,796      
Concession financial assets 1,202      
Other current assets 26,594      
Non-current assets 32,059      
Concession financial assets 5,925      
Intangible assets 11,377      
Other non-current assets 14,757      
Total assets 59,855      
Current liabilities 23,394      
Non-current liabilities 20,522      
Total liabilities 43,916      
Shareholders' equity 15,939      
Adjustments on adoption of IFRS 15 [member]        
Disclosure of impact of adoption of IFRS 15 on financial statements [line items]        
Concession financial assets (131)      
Concession contract assets 131      
Concession financial assets (998)      
Concession contract assets 1,598      
Intangible assets R$ (600)