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Provisions - Schedule of Provisions for contingencies (Detail) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of other provisions [line items]      
Other provisions Beginning Balance R$ 815 R$ 755 R$ 755
Additions 278 199 117
Reversals (286) (46) (59)
Closed (129) (93) (58)
Other provisions ending balance 678 815 755
Labor [member]      
Disclosure of other provisions [line items]      
Other provisions Beginning Balance 350 290 323
Additions 210 125 39
Reversals (4) (5) (35)
Closed (82) (60) (37)
Other provisions ending balance 474 350 290
Customer relations [member]      
Disclosure of other provisions [line items]      
Other provisions Beginning Balance   18 19
Additions     14
Reversals     (2)
Closed     (13)
Other provisions ending balance     18
Other civil actions [member]      
Disclosure of other provisions [line items]      
Other provisions Beginning Balance 40 28 24
Additions 10 18 10
Reversals (2)    
Closed (5) (6) (6)
Other provisions ending balance 43 40 28
Civil cases [Member]      
Disclosure of other provisions [line items]      
Other provisions Beginning Balance 55 46 43
Additions 31 33 24
Reversals (4) (3) (2)
Closed (21) (21) (19)
Other provisions ending balance 61 55 46
Tax [member]      
Disclosure of other provisions [line items]      
Other provisions Beginning Balance 68 67 72
Additions 9 3 5
Reversals (2) (1) (9)
Closed (18) (1) (1)
Other provisions ending balance 57 68 67
Environment [member]      
Disclosure of other provisions [line items]      
Other provisions Beginning Balance     1
Reversals     (1)
Regulatory [member]      
Disclosure of other provisions [line items]      
Other provisions Beginning Balance 44 46 36
Additions 15 3 13
Reversals (18) (3) (3)
Closed (1) (2)  
Other provisions ending balance 40 44 46
Corporate [Member]      
Disclosure of other provisions [line items]      
Other provisions Beginning Balance 239 269 239
Additions     30
Reversals (239) (30)  
Other provisions ending balance   239 269
Other [member]      
Disclosure of other provisions [line items]      
Other provisions Beginning Balance 59 37 41
Additions 13 35 6
Reversals (19) (4) (9)
Closed (7) (9) (1)
Other provisions ending balance 46 59 37
Consumer relations [member]      
Disclosure of other provisions [line items]      
Other provisions Beginning Balance 15 18  
Additions 21 15  
Reversals (2) (3)  
Closed (16) (15)  
Other provisions ending balance R$ 18 R$ 15 R$ 18