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Consolidated Statements of Cash Flows - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating activities      
Income before income taxes R$ 23,743,559 R$ 31,905,456 R$ 9,603,583
Adjustments to reconcile income before income tax to net cash flow from operating activities:      
Impairment of loans and advances 16,860,835 15,350,278 14,721,152
Changes in the technical provisions for insurance and pension plans 34,805,771 32,781,918 28,286,039
Net (gains)/losses from disposals of assets available for sale (2,299,397) (764,707) 247,288
Expenses with provisions and contingent liabilities 2,471,288 2,518,761 3,510,916
Deferred acquisition cost (insurance) 680,136 194,994 (95,110)
Impairment of assets 1,925,304 2,388,580 650,588
Depreciation 1,237,328 1,140,369 1,057,722
Amortization of intangible assets 3,331,240 2,516,777 1,884,281
Share of profit of associates and joint ventures (1,718,411) (1,699,725) (1,528,051)
Losses on disposal of non-current assets held for sale 577,212 442,251 180,602
Net losses from disposal of property and equipment 106,722 24,791 96,630
(Gains) on sale of investments in associates (270,977) 0 0
Effect of Changes in Exchange Rates in Cash and Cash equivalents (806,312) 5,617,747 (2,911,155)
Changes in assets and liabilities:      
(Increase)/Decrease in reserve requirement - Central Bank (8,677,695) 11,651,121 (3,866,979)
(Increase)/decrease in loans and advances to banks (2,493,535) 10,368,220 2,045,985
(Increase)/decrease in loans and advances to customers (59,578,512) (49,649,090) (95,025,702)
(Increase)/decrease in financial assets held for trading (23,089,236) (40,248,319) (80,159,223)
(Increase)/decrease in other assets (23,384,107) (8,296,942) (32,926,622)
Increase/(decrease) in deposits from banks 3,955,797 33,269,744 40,729,421
Increase/(decrease) in deposits from customers 36,853,866 (6,707,994) (3,463,924)
Increase/(decrease) in financial liabilities held for trading 839,321 (9,700,099) 16,030,156
Increase/(decrease) in technical provisions for insurance and pension plans (11,556,181) (2,042,897) (3,904,319)
Increase/(decrease) in other provisions (2,272,970) (3,019,960) (2,011,000)
Increase/(decrease) in other liabilities 19,117,355 10,312,756 29,295,296
Interest received 61,743,368 70,917,068 62,725,684
Interest paid (27,254,361) (45,140,018) (38,823,738)
Income tax and social contribution paid (8,575,438) (9,771,075) (7,419,802)
Other changes in taxes (720,182) (400,787) (283,883)
Net cash provided by/(used in) operating activities 35,551,788 53,959,218 (61,354,165)
Investing activities      
(Acquisitions)/disposal of subsidiaries, net of cash and cash equivalents paid/received 0 (7,188,659) 0
(Acquisitions) of financial assets available for sale (114,186,612) (108,296,179) (61,153,632)
Proceeds from sale of financial assets available for sale 82,760,146 115,724,092 39,147,316
Maturity of investments held to maturity 4,219,351 0 269,063
(Acquisitions) of investments held to maturity (204,557) 0 0
Disposal of non-current assets held for sale 796,869 629,768 742,732
(Acquisitions) of investments in associates (83,172) (376,434) (971,672)
Dividends and interest on capital received 845,134 510,285 668,178
(Acquisition) of property and equipment (1,897,645) (2,779,321) (2,181,549)
Sale of premises and equipment 445,347 486,303 205,094
(Acquisition) of intangible assets (3,743,704) (2,343,497) (1,971,881)
Dividends received 83,341 117,972 251,623
Interest received 12,735,539 12,668,011 13,033,426
Net cash provided by/(used in) investing activities (18,229,963) 9,152,341 (11,961,302)
Financing activities      
Funds from securities issued 62,237,380 47,253,373 68,385,187
Payments on securities issued (72,494,509) (47,861,607) (49,217,829)
Issuance of subordinated debts 6,594,610 3,787,207 11,304,318
Payments on subordinated debts (8,666,038) (581,713) (1,271,261)
Acquisition of treasury shares 0 (9,466) (133,033)
Increase/(decrease) of non-controlling interest 2,099 3,265 28,446
Interest paid (24,465,562) (20,504,528) (11,093,967)
Interest on equity and dividends paid (6,512,102) (5,611,350) (5,007,596)
Net cash provided by/(used in) financing activities (43,304,122) (23,524,819) 12,994,265
(Decrease)/Increase in cash and cash equivalents (25,982,297) 39,586,740 (60,321,202)
Cash and cash equivalents      
At the beginning of the year 181,230,427 147,261,434 204,671,481
Effect of Changes in Exchange Rates in Cash and Cash equivalents 806,312 (5,617,747) 2,911,155
At the end of the year 156,054,442 181,230,427 147,261,434
(Decrease)/Increase in cash and cash equivalents (25,982,297) 39,586,740 (60,321,202)
Non-cash transactions      
Credit operations transferred to non-current assets held for sale 1,953,996 2,122,871 1,591,998
Dividends and interest on equity declared but not yet paid 4,295,314 4,482,718 3,622,958
Unrealized (gains)/losses on securities available for sale R$ (2,187,365) R$ (3,711,027) R$ 3,403,920