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Net income from insurance and pension plans (Details 1) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Net income from insurance and pension plans [Abstract]      
Written premiums R$ 65,864,591 R$ 62,470,571 R$ 55,920,681
Supplemental pension plan contributions 5,090,043 3,679,922 3,795,219
Granted coinsurance premiums (49,715) (70,862) (88,612)
Refunded premiums (667,196) (746,244) (522,309)
Net written premiums earned 70,237,723 65,333,387 59,104,979
Reinsurance premiums paid (191,088) (306,265) (344,199)
Premiums retained from insurance and pension plans 70,046,635 65,027,122 58,760,780
Changes in the provision for insurance (30,435,868) (29,729,884) (25,528,076)
Changes in the provision for private pension plans (4,369,903) (3,052,034) (2,757,963)
Changes in the technical provisions for insurance and pension plans (34,805,771) (32,781,918) (28,286,039)
Reported indemnities (25,924,687) (24,877,804) (21,658,594)
Claims expenses (36,068) (119,201) (69,599)
Recovery of ceded coinsurance 35,332 65,285 87,053
Recovery of reinsurance 116,913 141,711 407,195
Salvage recoveries 488,057 451,930 402,718
Changes in the IBNR provision (274,509) (204,354) (892,816)
Retained claims (25,594,962) (24,542,433) (21,724,043)
Commissions on premiums (2,700,131) (2,696,002) (1,985,426)
Recovery of commissions 19,334 29,927 21,700
Fees (403,835) (489,279) (1,201,216)
Brokerage expenses - private pension plans (153,552) (167,654) (188,037)
Changes in deferred commissions (167,728) (224,000) 99,786
Selling expenses for insurance and pension plans (3,405,912) (3,547,008) (3,253,193)
Net income from insurance and pension plans R$ 6,239,990 R$ 4,155,763 R$ 5,497,505