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Provisions - Schedule of Provisions for contingencies (Detail) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of other provisions [line items]      
Other provisions Beginning Balance R$ 678 R$ 815 R$ 755
Additions 115 278 199
Reversals (64) (286) (46)
Settled (88) (129) (93)
Other provisions ending balance 641 678 815
Labor [member]      
Disclosure of other provisions [line items]      
Other provisions Beginning Balance 474 350 290
Additions 67 210 125
Reversals (25) (4) (5)
Settled (59) (82) (60)
Other provisions ending balance 457 474 350
Other civil actions [member]      
Disclosure of other provisions [line items]      
Other provisions Beginning Balance 43 40 28
Additions 10 10 18
Reversals (14) (2)  
Settled (10) (5) (6)
Other provisions ending balance 29 43 40
Civil cases [member]      
Disclosure of other provisions [line items]      
Other provisions Beginning Balance 61 55 46
Additions 27 31 33
Reversals (14) (4) (3)
Settled (26) (21) (21)
Other provisions ending balance 48 61 55
Tax [member]      
Disclosure of other provisions [line items]      
Other provisions Beginning Balance 57 68 67
Additions 5 9 3
Reversals (10) (2) (1)
Settled   (18) (1)
Other provisions ending balance 52 57 68
Environment [member]      
Disclosure of other provisions [line items]      
Additions 1    
Other provisions ending balance 1    
Regulatory [member]      
Disclosure of other provisions [line items]      
Other provisions Beginning Balance 40 44 46
Additions 8 15 3
Reversals (10) (18) (3)
Settled (1) (1) (2)
Other provisions ending balance 37 40 44
Other [member]      
Disclosure of other provisions [line items]      
Other provisions Beginning Balance 46 59 37
Additions 7 13 35
Reversals (5) (19) (4)
Settled (2) (7) (9)
Other provisions ending balance 46 46 59
Customer relations [member]      
Disclosure of other provisions [line items]      
Other provisions Beginning Balance 18 15 18
Additions 17 21 15
Reversals   (2) (3)
Settled (16) (16) (15)
Other provisions ending balance R$ 19 18 15
Corporate [Member]      
Disclosure of other provisions [line items]      
Other provisions Beginning Balance   239 269
Reversals   R$ (239) (30)
Other provisions ending balance     R$ 239