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Insurance Contracts and Private Pension - Summary of Changes in Technical Provisions (Detail) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2017
Disclosure of other provisions [line items]      
Unearned premiums (PPNG) R$ 2,124 R$ 1,898  
Mathematical reserve for benefits to be granted (PMBAC) and benefits granted (PMBC) 195,543 176,165  
Redemptions and Other Unsettled Amounts (PVR) 310 275  
Financial surplus (PEF) 607 606  
Unsettled claims (PSL) 591 594  
Claims / events incurred but not reported (IBNR) 373 428  
Related Expenses (PDR) 129 123  
Other 1,510 1,143  
Total 201,187 181,232 R$ 154,076
Opening balance 181,232 154,076  
Additions arising from premiums / contribution 24,104 26,913  
Risk adjustments (4,234) (4,548)  
Payment of claims / benefits (1,764) (1,700)  
Reported claims 1,325 1,291  
Redemptions (13,772) (12,536)  
Portability of insurances 3,758 3,436  
Adjustment of reserves and financial surplus 11,631 7,770  
Corporate Reorganization   (282)  
Other (recognition / reversal) (1,093) 6,812  
Closing balance 201,187 181,232  
Insurance [member]      
Disclosure of other provisions [line items]      
Unearned premiums (PPNG) 2,111 1,883  
Mathematical reserve for benefits to be granted (PMBAC) and benefits granted (PMBC) 195 173  
Redemptions and Other Unsettled Amounts (PVR) 12 11  
Financial surplus (PEF) 2 2  
Unsettled claims (PSL) 548 560  
Claims / events incurred but not reported (IBNR) 348 401  
Related Expenses (PDR) 31 28  
Other 562 406  
Total 3,809 3,464  
Opening balance 3,464 3,926  
Additions arising from premiums / contribution 4,340 4,059  
Risk adjustments (3,937) (4,225)  
Payment of claims / benefits (1,184) (1,228)  
Reported claims 1,325 1,291  
Redemptions (1) (2)  
Adjustment of reserves and financial surplus 9 16  
Corporate Reorganization   (282)  
Other (recognition / reversal) (207) (91)  
Closing balance 3,809 3,464  
Private Pension [Member]      
Disclosure of other provisions [line items]      
Unearned premiums (PPNG) 13 15  
Mathematical reserve for benefits to be granted (PMBAC) and benefits granted (PMBC) 195,348 175,992  
Redemptions and Other Unsettled Amounts (PVR) 298 264  
Financial surplus (PEF) 605 604  
Unsettled claims (PSL) 43 34  
Claims / events incurred but not reported (IBNR) 25 27  
Related Expenses (PDR) 98 95  
Other 948 737  
Total 197,378 177,768  
Opening balance 177,768 150,150  
Additions arising from premiums / contribution 19,764 22,854  
Risk adjustments (297) (323)  
Payment of claims / benefits (580) (472)  
Redemptions (13,771) (12,534)  
Portability of insurances 3,758 3,436  
Adjustment of reserves and financial surplus 11,622 7,754  
Other (recognition / reversal) (886) 6,903  
Closing balance R$ 197,378 R$ 177,768