XML 115 R108.htm IDEA: XBRL DOCUMENT v3.19.1
Income and Social Contribution Taxes - Summary of Deferred Income and Social Contribution Taxes (Detail) - BRL (R$)
R$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of income and social contribution taxes recoverable [Line Items]        
Deferred tax assets R$ 3,471 R$ 3,052    
Deferred tax liabilities (2,052) (1,916)    
Total, net 1,419 1,136 R$ 1,215 R$ 809
Total assets 2,147 1,871    
Total liabilities (728) (735)    
Funding cost [member]        
Disclosure of income and social contribution taxes recoverable [Line Items]        
Deferred tax liabilities (25) (31)    
Deemed cost [member]        
Disclosure of income and social contribution taxes recoverable [Line Items]        
Deferred tax liabilities (239) (276)    
Cost of acquisition of equity interests [member]        
Disclosure of income and social contribution taxes recoverable [Line Items]        
Deferred tax liabilities (501) (464)    
Borrowing costs capitalized [member]        
Disclosure of income and social contribution taxes recoverable [Line Items]        
Deferred tax liabilities (168) (166)    
Taxes on revenues not redeemed - Presumed Profit accounting method [member]        
Disclosure of income and social contribution taxes recoverable [Line Items]        
Deferred tax liabilities (5) (1)    
Adjustment of expectation of cash flow concession assets [member]        
Disclosure of income and social contribution taxes recoverable [Line Items]        
Deferred tax liabilities (804) (937)    
Adjustment to fair value: Swap/gains [member]        
Disclosure of income and social contribution taxes recoverable [Line Items]        
Deferred tax liabilities (277) (1)    
Other Deferred Income And Social Contribution Taxes Liabilities [member]        
Disclosure of income and social contribution taxes recoverable [Line Items]        
Deferred tax liabilities (33) (40)    
Tax loss carry forwards [member]        
Disclosure of income and social contribution taxes recoverable [Line Items]        
Deferred tax assets 373 524    
Provisions for contingencies [member]        
Disclosure of income and social contribution taxes recoverable [Line Items]        
Deferred tax assets 218 218    
Provision for losses [member]        
Disclosure of income and social contribution taxes recoverable [Line Items]        
Deferred tax assets 609 335    
Operating provisions [member]        
Disclosure of income and social contribution taxes recoverable [Line Items]        
Deferred tax assets 455 539    
Provisions for profit sharing [member]        
Disclosure of income and social contribution taxes recoverable [Line Items]        
Deferred tax assets 25 1    
Post-employment obligations [member]        
Disclosure of income and social contribution taxes recoverable [Line Items]        
Deferred tax assets 1,477 1,179    
Estimated provision for doubtful receivables [member]        
Disclosure of income and social contribution taxes recoverable [Line Items]        
Deferred tax assets 279 207    
Taxes with suspended liability [member]        
Disclosure of income and social contribution taxes recoverable [Line Items]        
Deferred tax assets   14    
Onerous concession [member]        
Disclosure of income and social contribution taxes recoverable [Line Items]        
Deferred tax assets 8 8    
Adjustment to fair value: Swap/loss [member]        
Disclosure of income and social contribution taxes recoverable [Line Items]        
Deferred tax assets   13    
Other [member]        
Disclosure of income and social contribution taxes recoverable [Line Items]        
Deferred tax assets R$ 27 R$ 14