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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, 2019
Dec. 31, 2018
Disclosure of other provisions [line items]    
Unearned premiums (PPNG) R$ 2,356 R$ 2,124
Mathematical reserve for benefits to be granted (PMBAC) and benefits granted (PMBC) 212,477 195,543
Redemptions and Other Unsettled Amounts (PVR) 331 310
Financial surplus (PEF) 613 607
Unsettled claims (PSL) 618 591
Claims / events incurred but not reported (IBNR) 299 373
Related Expenses (PDR) 117 129
Other 1,523 1,510
Total 218,334 201,187
Opening balance 201,187 181,232
Additions arising from premiums / contribution 19,642 24,104
Risk adjustments (4,489) (4,234)
Payment of claims / benefits (1,915) (1,764)
Reported claims 1,465 1,325
Redemptions (15,623) (13,772)
Portability of insurances 1,754 3,758
Adjustment of reserves and financial surplus 16,517 11,631
Other (recognition / reversal) (204) (1,093)
Closing balance 218,334 201,187
Insurance [member]    
Disclosure of other provisions [line items]    
Unearned premiums (PPNG) 2,343 2,111
Mathematical reserve for benefits to be granted (PMBAC) and benefits granted (PMBC) 205 195
Redemptions and Other Unsettled Amounts (PVR) 13 12
Financial surplus (PEF) 2 2
Unsettled claims (PSL) 570 642
Claims / events incurred but not reported (IBNR) 277 254
Related Expenses (PDR) 28 31
Other 250 562
Total 3,688 3,809
Opening balance 3,809 3,464
Additions arising from premiums / contribution 4,634 4,340
Risk adjustments (4,216) (3,937)
Payment of claims / benefits (1,349) (1,184)
Reported claims 1,465 1,325
Redemptions   (1)
Adjustment of reserves and financial surplus 10 9
Other (recognition / reversal) (665) (207)
Closing balance 3,688 3,809
Private Pension [Member]    
Disclosure of other provisions [line items]    
Unearned premiums (PPNG) 13 13
Mathematical reserve for benefits to be granted (PMBAC) and benefits granted (PMBC) 212,272 195,348
Redemptions and Other Unsettled Amounts (PVR) 318 298
Financial surplus (PEF) 611 605
Unsettled claims (PSL) 48 43
Claims / events incurred but not reported (IBNR) 22 25
Related Expenses (PDR) 89 98
Other 1,273 948
Total 214,646 197,378
Opening balance 197,378 177,768
Additions arising from premiums / contribution 15,008 19,764
Risk adjustments (273) (297)
Payment of claims / benefits (566) (580)
Redemptions (15,623) (13,771)
Portability of insurances 1,754 3,758
Adjustment of reserves and financial surplus 16,507 11,622
Other (recognition / reversal) 461 (886)
Closing balance R$ 214,646 R$ 197,378