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Derivatives (Details 3) - BRL (R$)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount   R$ 6,064,000,000
Balance sheet account receivable / (received) (payable) paid R$ (3,456,000,000) 387,000,000
Adjustment to fair value (in results / stockholders' equity) 4,803,000,000 5,454,000,000
Fair value 1,347,000,000 5,841,000,000
Liability Position [Member]    
IfrsStatementLineItems [Line Items]    
Balance sheet account receivable / (received) (payable) paid (56,371,000,000) (41,710,000,000)
Adjustment to fair value (in results / stockholders' equity) (20,490,000,000) (21,494,000,000)
Fair value (76,861,000,000) (63,204,000,000)
Assets 1 [Member]    
IfrsStatementLineItems [Line Items]    
Balance sheet account receivable / (received) (payable) paid 52,915,000,000 42,097,000,000
Adjustment to fair value (in results / stockholders' equity) 25,293,000,000 26,948,000,000
Fair value 78,208,000,000 69,045,000,000
Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 909,000,000 932,000,000
Balance sheet account receivable / (received) (payable) paid (211,000,000) (139,000,000)
Adjustment to fair value (in results / stockholders' equity) (405,000,000) (16,000,000)
Fair value (616,000,000) (155,000,000)
Purchase Commitments [Member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 418,886,000,000  
Purchase commitments shares [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 3,395,000,000  
Purchase Commitments Commodities [Member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 503,000,000  
Purchase commitments interest [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 385,229,000,000  
Purchase Commitments Foreign Currency [Member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 29,759,000,000  
Commitments To Sell [Member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 601,719,000,000 386,886,000,000
Commitments to sell shares [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 11,702,000,000 14,181,000,000
Commitments To Sell Commodities [Member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 3,896,000,000 3,308,000,000
Commitments to sell interest [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 557,806,000,000 342,575,000,000
Commitments To Sell Foreign Currency [Member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 28,315,000,000 26,822,000,000
Purchases Receivable [Member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount   1,016,000,000
Balance sheet account receivable / (received) (payable) paid   1,186,000,000
Adjustment to fair value (in results / stockholders' equity)   (27,000,000)
Fair value   1,159,000,000
Sales Receivable [Member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 3,901,000,000 20,765,000,000
Balance sheet account receivable / (received) (payable) paid 153,000,000 1,938,000,000
Adjustment to fair value (in results / stockholders' equity) 14,000,000
Fair value 153,000,000 1,952,000,000
Sales Receivables Interest [Member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Balance sheet account receivable / (received) (payable) paid (694,000,000)  
Fair value   (694,000,000)
Other Derivative Financial Instruments Shares [Member] | Not later than one year [member] | Other Derivative Financial Instruments Asset Position [Member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount   576,000,000
Balance sheet account receivable / (received) (payable) paid   (9,000,000)
Adjustment to fair value (in results / stockholders' equity)   (12,000,000)
Fair value   (21,000,000)
Other derivative financial instruments interest [member] | Not later than one year [member] | Other Derivative Financial Instruments Asset Position [Member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount   347,000,000
Balance sheet account receivable / (received) (payable) paid   (130,000,000)
Adjustment to fair value (in results / stockholders' equity)   (3,000,000)
Fair value   (133,000,000)
Futures contract [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 1,020,605,000,000 857,781,000,000
Futures contract [member] | Later than one year [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 152,157,000,000 164,160,000,000
Futures contract [member] | Purchase Commitments [Member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount   470,895,000,000
Futures contract [member] | Purchase commitments shares [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount   14,627,000,000
Futures contract [member] | Purchase Commitments Commodities [Member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount   703,000,000
Futures contract [member] | Purchase commitments interest [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount   429,862,000,000
Futures contract [member] | Purchase Commitments Foreign Currency [Member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount   25,703,000,000
Swap contract [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 1,571,025,000,000 1,338,457,000,000
Balance sheet account receivable / (received) (payable) paid 2,948,000,000 (1,861,000,000)
Adjustment to fair value (in results / stockholders' equity) 4,886,000,000 5,229,000,000
Fair value 7,834,000,000 3,368,000,000
Swap contract [member] | Liability Position [Member]    
IfrsStatementLineItems [Line Items]    
Balance sheet account receivable / (received) (payable) paid (19,448,000,000)  
Adjustment to fair value (in results / stockholders' equity) (19,620,000,000)  
Fair value (39,068,000,000)  
Swap contract [member] | Later than one year [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 975,785,000,000 930,714,000,000
Swap contract [member] | Asset Position [Member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 1,571,025,000,000 1,338,457,000,000
Balance sheet account receivable / (received) (payable) paid 22,396,000,000 13,410,000,000
Adjustment to fair value (in results / stockholders' equity) 24,506,000,000 24,604,000,000
Fair value 46,902,000,000 38,014,000,000
Swap contract [member] | Asset Position Commodities [Member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 222,000,000 2,000,000
Balance sheet account receivable / (received) (payable) paid 1,000,000  
Adjustment to fair value (in results / stockholders' equity) 1,000,000  
Fair value 2,000,000  
Swap contract [member] | Asset position interest [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 1,509,045,000,000 1,318,082,000,000
Balance sheet account receivable / (received) (payable) paid 20,913,000,000 10,339,000,000
Adjustment to fair value (in results / stockholders' equity) 23,502,000,000 23,835,000,000
Fair value 44,415,000,000 34,174,000,000
Swap contract [member] | Asset Position Foreign Currency [Member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 61,758,000,000 20,373,000,000
Balance sheet account receivable / (received) (payable) paid 1,482,000,000 3,071,000,000
Adjustment to fair value (in results / stockholders' equity) 1,003,000,000 769,000,000
Fair value 2,485,000,000 3,840,000,000
Swap contract [member] | Liability Position [Member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 1,571,025,000,000 1,338,457,000,000
Balance sheet account receivable / (received) (payable) paid   (15,271,000,000)
Adjustment to fair value (in results / stockholders' equity)   (19,375,000,000)
Fair value   (34,646,000,000)
Swap contract [member] | Liability position shares [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 1,604,000,000 497,000,000
Balance sheet account receivable / (received) (payable) paid (180,000,000) (37,000,000)
Adjustment to fair value (in results / stockholders' equity) 59,000,000 (3,000,000)
Fair value (121,000,000) (40,000,000)
Swap contract [member] | Liability Position Commodities [Member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 609,000,000 130,000,000
Balance sheet account receivable / (received) (payable) paid (5,000,000)  
Adjustment to fair value (in results / stockholders' equity) 1,000,000 (1,000,000)
Fair value (4,000,000) (1,000,000)
Swap contract [member] | Liability position interest [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 1,491,476,000,000 1,309,778,000,000
Balance sheet account receivable / (received) (payable) paid (18,130,000,000) (13,331,000,000)
Adjustment to fair value (in results / stockholders' equity) (18,487,000,000) (19,377,000,000)
Fair value (36,617,000,000) (32,708,000,000)
Swap contract [member] | Liability Position Foreign Currency [Member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 77,336,000,000 28,052,000,000
Balance sheet account receivable / (received) (payable) paid (1,133,000,000) (1,903,000,000)
Adjustment to fair value (in results / stockholders' equity) (1,193,000,000) 6,000,000
Fair value (2,326,000,000) (1,897,000,000)
Option Contracts [Member] | Liability Position Foreign Currency [Member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount   1,621,736,000,000
Balance sheet account receivable / (received) (payable) paid   154,000,000
Adjustment to fair value (in results / stockholders' equity)   (1,449,000,000)
Fair value   (1,295,000,000)
Option contract [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 1,352,201,000,000 1,621,736,000,000
Balance sheet account receivable / (received) (payable) paid (5,960,000,000)  
Adjustment to fair value (in results / stockholders' equity) (251,000,000)  
Fair value (6,211,000,000)  
Option contract [member] | Later than one year [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 58,633,000,000 77,281,000,000
Option contract [member] | Purchase Commitments [Member] | Later than one year [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 267,199,000,000 145,412,000,000
Balance sheet account receivable / (received) (payable) paid 3,071,000,000 17,981,000,000
Adjustment to fair value (in results / stockholders' equity) (665,000,000) 1,496,000,000
Fair value 2,406,000,000 19,477,000,000
Option contract [member] | Purchase Commitments [Member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 223,496,000,000 79,734,000,000
Balance sheet account receivable / (received) (payable) paid (7,997,000,000) (17,595,000,000)
Adjustment to fair value (in results / stockholders' equity) 444,000,000 (2,781,000,000)
Fair value (7,553,000,000) (20,376,000,000)
Option contract [member] | Purchase commitments shares [member] | Later than one year [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 131,529,000,000 11,929,000,000
Balance sheet account receivable / (received) (payable) paid 1,786,000,000 521,000,000
Adjustment to fair value (in results / stockholders' equity) (131,000,000) 1,140,000,000
Fair value 1,655,000,000 1,661,000,000
Option contract [member] | Purchase commitments shares [member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 131,361,000,000 14,045,000,000
Balance sheet account receivable / (received) (payable) paid (4,448,000,000) (348,000,000)
Adjustment to fair value (in results / stockholders' equity) 155,000,000 (1,185,000,000)
Fair value (4,293,000,000) (1,533,000,000)
Option contract [member] | Purchase Commitments Commodities [Member] | Later than one year [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 2,347,000,000 471,000,000
Balance sheet account receivable / (received) (payable) paid 43,000,000 20,000,000
Adjustment to fair value (in results / stockholders' equity) (7,000,000) 20,000,000
Fair value 36,000,000 40,000,000
Option contract [member] | Purchase Commitments Commodities [Member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 2,000,000,000 274,000,000
Balance sheet account receivable / (received) (payable) paid (15,000,000) (8,000,000)
Adjustment to fair value (in results / stockholders' equity) 5,000,000 (1,000,000)
Fair value (10,000,000) (9,000,000)
Option contract [member] | Purchase commitments interest [member] | Later than one year [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 93,795,000,000 63,697,000,000
Balance sheet account receivable / (received) (payable) paid 156,000,000 127,000,000
Adjustment to fair value (in results / stockholders' equity) 4,000,000 98,000,000
Fair value 160,000,000 225,000,000
Option contract [member] | Purchase commitments interest [member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 64,256,000,000 3,284,000,000
Balance sheet account receivable / (received) (payable) paid (181,000,000) (68,000,000)
Adjustment to fair value (in results / stockholders' equity) (5,000,000) (48,000,000)
Fair value (186,000,000) (116,000,000)
Option contract [member] | Purchase Commitments Foreign Currency [Member] | Later than one year [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 39,528,000,000 69,315,000,000
Balance sheet account receivable / (received) (payable) paid 1,086,000,000 17,313,000,000
Adjustment to fair value (in results / stockholders' equity) (531,000,000) 238,000,000
Fair value 555,000,000 17,551,000,000
Option contract [member] | Purchase Commitments Foreign Currency [Member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 25,879,000,000 62,131,000,000
Balance sheet account receivable / (received) (payable) paid (3,353,000,000) (17,171,000,000)
Adjustment to fair value (in results / stockholders' equity) 289,000,000 (1,547,000,000)
Fair value (3,064,000,000) (18,718,000,000)
Option contract [member] | Commitments To Sell [Member] | Later than one year [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 419,044,000,000 668,380,000,000
Balance sheet account receivable / (received) (payable) paid 20,238,000,000 2,433,000,000
Adjustment to fair value (in results / stockholders' equity) 1,027,000,000 (658,000,000)
Fair value 21,265,000,000 1,775,000,000
Option contract [member] | Commitments To Sell [Member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 442,462,000,000 728,210,000,000
Balance sheet account receivable / (received) (payable) paid (21,272,000,000) (2,665,000,000)
Adjustment to fair value (in results / stockholders' equity) (1,057,000,000) 494,000,000
Fair value (22,329,000,000) (2,171,000,000)
Option contract [member] | Commitments to sell shares [member] | Later than one year [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 138,899,000,000 18,928,000,000
Balance sheet account receivable / (received) (payable) paid 19,592,000,000 878,000,000
Adjustment to fair value (in results / stockholders' equity) 1,094,000,000 339,000,000
Fair value 20,686,000,000 1,217,000,000
Option contract [member] | Commitments to sell shares [member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount   16,545,000,000
Balance sheet account receivable / (received) (payable) paid (32,000,000) (648,000,000)
Adjustment to fair value (in results / stockholders' equity) 10,000,000 (368,000,000)
Fair value (22,000,000) (1,016,000,000)
Option contract [member] | Commitments To Sell Commodities [Member] | Later than one year [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 904,000,000 306,000,000
Balance sheet account receivable / (received) (payable) paid 18,000,000 9,000,000
Adjustment to fair value (in results / stockholders' equity) (6,000,000) (3,000,000)
Fair value 12,000,000 6,000,000
Option contract [member] | Commitments To Sell Commodities [Member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 963,000,000 266,000,000
Balance sheet account receivable / (received) (payable) paid   (19,000,000)
Adjustment to fair value (in results / stockholders' equity)   11,000,000
Fair value   (8,000,000)
Option contract [member] | Commitments to sell interest [member] | Later than one year [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 256,483,000,000 582,086,000,000
Balance sheet account receivable / (received) (payable) paid 51,000,000 154,000,000
Adjustment to fair value (in results / stockholders' equity) 6,000,000 (148,000,000)
Fair value 57,000,000 6,000,000
Option contract [member] | Commitments to sell interest [member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 270,585,000,000 642,475,000,000
Balance sheet account receivable / (received) (payable) paid (66,000,000) (227,000,000)
Adjustment to fair value (in results / stockholders' equity) (13,000,000) 211,000,000
Fair value (79,000,000) (16,000,000)
Option contract [member] | Commitments To Sell Foreign Currency [Member] | Later than one year [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 22,758,000,000 67,060,000,000
Balance sheet account receivable / (received) (payable) paid 577,000,000 1,392,000,000
Adjustment to fair value (in results / stockholders' equity) (67,000,000) (846,000,000)
Fair value 510,000,000 546,000,000
Option contract [member] | Commitments To Sell Foreign Currency [Member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 33,592,000,000 68,924,000,000
Balance sheet account receivable / (received) (payable) paid (3,707,000,000) (1,771,000,000)
Adjustment to fair value (in results / stockholders' equity) 33,000,000 640,000,000
Fair value (3,674,000,000) (1,131,000,000)
Forward contract [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 4,755,000,000 26,129,000,000
Forward contract [member] | Later than one year [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 6,000,000 3,000,000
Forward contract [member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 4,755,000,000 26,129,000,000
Balance sheet account receivable / (received) (payable) paid 549,000,000 2,362,000,000
Adjustment to fair value (in results / stockholders' equity) (13,000,000) (13,000,000)
Fair value 536,000,000 2,349,000,000
Purchases Receivable [Member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 187,000,000  
Balance sheet account receivable / (received) (payable) paid 452,000,000  
Adjustment to fair value (in results / stockholders' equity) (4,000,000)  
Fair value 448,000,000  
Purchases Receivable [Member] | Purchases receivable shares [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 157,000,000  
Balance sheet account receivable / (received) (payable) paid 157,000,000  
Adjustment to fair value (in results / stockholders' equity) (5,000,000)  
Fair value 152,000,000  
Purchases Receivable [Member] | Purchases receivable shares [member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount   948,000,000
Balance sheet account receivable / (received) (payable) paid   948,000,000
Adjustment to fair value (in results / stockholders' equity)   (27,000,000)
Fair value   921,000,000
Purchases Receivable [Member] | Purchases receivable interest [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 30,000,000  
Balance sheet account receivable / (received) (payable) paid 295,000,000  
Adjustment to fair value (in results / stockholders' equity) 1,000,000  
Fair value 296,000,000  
Purchases Receivable [Member] | Purchases receivable interest [member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount   68,000,000
Balance sheet account receivable / (received) (payable) paid   238,000,000
Fair value   238,000,000
Purchases Payable [Member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount  
Balance sheet account receivable / (received) (payable) paid (30,000,000)  
Fair value (30,000,000)  
Purchases Payable [Member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Balance sheet account receivable / (received) (payable) paid   (68,000,000)
Fair value   (68,000,000)
Purchases Payable [Member] | Purchases payable interest [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount  
Balance sheet account receivable / (received) (payable) paid (30,000,000)  
Fair value (30,000,000)  
Purchases Payable [Member] | Purchases payable interest [member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Balance sheet account receivable / (received) (payable) paid   (68,000,000)
Fair value   (68,000,000)
Purchases Payable [Member] | Purchases Payable Foreign Currency [Member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount   19,507,000,000
Fair value   15,000,000
Sales Receivable Interests [Member] | Commitments To Sell Commodities [Member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 6,000,000  
Balance sheet account receivable / (received) (payable) paid 6,000,000  
Adjustment to fair value (in results / stockholders' equity)  
Fair value 6,000,000  
Sales Receivable Interests [Member] | Commitments To Sell Foreign Currency [Member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 3,769,000,000  
Balance sheet account receivable / (received) (payable) paid  
Adjustment to fair value (in results / stockholders' equity)  
Fair value  
Sales Receivable Interests [Member] | Sales receivable shares [member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 126,000,000 1,258,000,000
Balance sheet account receivable / (received) (payable) paid 124,000,000 1,244,000,000
Adjustment to fair value (in results / stockholders' equity) (1,000,000)
Fair value 124,000,000 1,243,000,000
Sales Receivable Interests [Member] | Sales receivable interest [member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount  
Balance sheet account receivable / (received) (payable) paid   694,000,000
Adjustment to fair value (in results / stockholders' equity)  
Fair value   694,000,000
Sales Receivable Interests [Member] | Purchases Payable Foreign Currency [Member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Adjustment to fair value (in results / stockholders' equity)   15,000,000
Sales Receivable Interests [Member] | Sales Receivable Foreign Currency [Member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount   3,654,000,000
Sales Deliverable [Member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 667,000,000 4,348,000,000
Balance sheet account receivable / (received) (payable) paid   (694,000,000)
Fair value   (694,000,000)
Sales Deliverable [Member] | Sales deliverable shares [member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount   694,000,000
Sales Deliverable [Member] | Sales deliverable foreign currency [member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 644,000,000 141,629,000,000
Balance sheet account receivable / (received) (payable) paid 4,778,000,000
Adjustment to fair value (in results / stockholders' equity) (10,000,000) 688,000,000
Fair value (10,000,000) 5,466,000,000
Credit derivatives [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 43,808,000,000 21,556,000,000
Credit derivatives [member] | Later than one year [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 25,174,000,000 14,128,000,000
Credit derivatives [member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount   21,556,000,000
Balance sheet account receivable / (received) (payable) paid (101,000,000) (532,000,000)
Adjustment to fair value (in results / stockholders' equity) (11,000,000) 576,000,000
Fair value (112,000,000) 44,000,000
Credit derivatives [member] | Asset Position [Member] | Not later than one year [member] | Credit Derivatives Asset Position [Member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 28,724,000,000 13,414,000,000
Balance sheet account receivable / (received) (payable) paid 542,000,000 (271,000,000)
Adjustment to fair value (in results / stockholders' equity) (50,000,000) 513,000,000
Fair value 492,000,000 242,000,000
Credit derivatives [member] | Liability Position [Member] | Not later than one year [member] | Credit Derivatives Liability Position [Member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 15,084,000,000 8,142,000,000
Balance sheet account receivable / (received) (payable) paid (643,000,000) (261,000,000)
Adjustment to fair value (in results / stockholders' equity) 39,000,000 63,000,000
Fair value (604,000,000) (198,000,000)
Credit derivatives [member] | Liability position shares [member] | Not later than one year [member] | Credit Derivatives Liability Position [Member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 2,846,000,000 1,865,000,000
Balance sheet account receivable / (received) (payable) paid (58,000,000) (63,000,000)
Adjustment to fair value (in results / stockholders' equity) (58,000,000) 17,000,000
Fair value (116,000,000) (46,000,000)
Credit derivatives [member] | Liability position interest [member] | Not later than one year [member] | Credit Derivatives Liability Position [Member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 12,238,000,000 6,277,000,000
Balance sheet account receivable / (received) (payable) paid (585,000,000) (198,000,000)
Adjustment to fair value (in results / stockholders' equity) 97,000,000 46,000,000
Fair value (488,000,000) (152,000,000)
Credit derivatives [member] | Credit derivatives asset position shares [member] | Not later than one year [member] | Credit Derivatives Asset Position [Member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 2,192,000,000 1,784,000,000
Balance sheet account receivable / (received) (payable) paid 71,000,000 (37,000,000)
Adjustment to fair value (in results / stockholders' equity) 15,000,000 101,000,000
Fair value 86,000,000 64,000,000
Credit derivatives [member] | Credit Derivatives Asset Position Commodities [Member] | Not later than one year [member] | Credit Derivatives Asset Position [Member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount   18,000,000
Credit derivatives [member] | Credit derivatives asset position interest [member] | Not later than one year [member] | Credit Derivatives Asset Position [Member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 26,532,000,000 11,612,000,000
Balance sheet account receivable / (received) (payable) paid 471,000,000 (234,000,000)
Adjustment to fair value (in results / stockholders' equity) (65,000,000) 412,000,000
Fair value 406,000,000 178,000,000
Credit derivatives [member] | Credit Derivatives Asset Position Foreign Currency [Member] | Not later than one year [member] | Credit Derivatives Asset Position [Member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 162,679,000,000 133,304,000,000
Balance sheet account receivable / (received) (payable) paid   (4,967,000,000)
Adjustment to fair value (in results / stockholders' equity)   118,000,000
Fair value   (4,849,000,000)
Non Deliverable Forward [Member] | Not later than one year [member] | Non Deliverable Forward Asset Position [Member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 326,100,000,000 278,531,000,000
Balance sheet account receivable / (received) (payable) paid (936,000,000) 239,000,000
Adjustment to fair value (in results / stockholders' equity) 450,000,000 808,000,000
Fair value (486,000,000) 1,047,000,000
Non Deliverable Forward [Member] | Asset Position [Member] | Not later than one year [member] | Non Deliverable Forward Asset Position [Member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 162,554,000,000 144,123,000,000
Balance sheet account receivable / (received) (payable) paid 5,808,000,000 5,256,000,000
Adjustment to fair value (in results / stockholders' equity) 332,000,000 687,000,000
Fair value 6,140,000,000 5,943,000,000
Non Deliverable Forward [Member] | Liability Position [Member] | Not later than one year [member] | Non Deliverable Forward Liability Position [Member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 163,546,000,000 134,408,000,000
Balance sheet account receivable / (received) (payable) paid (6,744,000,000) (5,017,000,000)
Adjustment to fair value (in results / stockholders' equity) 118,000,000 121,000,000
Fair value (6,626,000,000) (4,896,000,000)
Non Deliverable Forward [Member] | Non Deliverable Forward Asset Position Shares [Member] | Not later than one year [member] | Non Deliverable Forward Asset Position [Member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount   5,000,000
Non Deliverable Forward [Member] | Non Deliverable Forward Asset Position Commodities [Member] | Not later than one year [member] | Non Deliverable Forward Asset Position [Member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount   2,489,000,000
Balance sheet account receivable / (received) (payable) paid   478,000,000
Adjustment to fair value (in results / stockholders' equity)   (1,000,000)
Fair value   477,000,000
Non Deliverable Forward [Member] | Non Deliverable Forward Liability Position Commodities [Member] | Not later than one year [member] | Non Deliverable Forward Liability Position [Member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 867,000,000 1,104,000,000
Balance sheet account receivable / (received) (payable) paid (81,000,000) (50,000,000)
Adjustment to fair value (in results / stockholders' equity) (4,000,000) 3,000,000
Fair value (85,000,000) (47,000,000)
Non Deliverable Forward [Member] | Credit Derivatives Asset Position Foreign Currency [Member] | Not later than one year [member] | Non Deliverable Forward Liability Position [Member]    
IfrsStatementLineItems [Line Items]    
Balance sheet account receivable / (received) (payable) paid (6,663,000,000)  
Adjustment to fair value (in results / stockholders' equity) 122,000,000  
Fair value (6,541,000,000)  
Non Deliverable Forward [Member] | Non Deliverable Forward Asset Position Foreign Currency [Member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount   9,000,000
Adjustment to fair value (in results / stockholders' equity)   (1,000,000)
Fair value   (1,000,000)
Non Deliverable Forward [Member] | Non Deliverable Forward Asset Position Foreign Currency [Member] | Not later than one year [member] | Non Deliverable Forward Liability Position [Member]    
IfrsStatementLineItems [Line Items]    
Balance sheet account receivable / (received) (payable) paid 5,465,000,000  
Adjustment to fair value (in results / stockholders' equity) 334,000,000  
Fair value 5,799,000,000  
Non Deliverable Forward [Member] | Non Deliverable Forward Asset Position Foreign Currency [Member] | Not later than one year [member] | Non Deliverable Forward Asset Position [Member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 159,611,000,000 61,000,000
Adjustment to fair value (in results / stockholders' equity)   282,000,000
Fair value   285,000,000
Other Derivative Financial Instruments [Member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount 8,170,000,000  
Other Derivative Financial Instruments [Member] | Later than one year [member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount R$ 6,390,000,000 4,502,000,000
Other Derivative Financial Instruments [Member] | Not later than one year [member] | Other Derivative Financial Instruments Asset Position [Member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount   6,064,000,000
Balance sheet account receivable / (received) (payable) paid   25,000,000
Adjustment to fair value (in results / stockholders' equity)   303,000,000
Fair value   328,000,000
Other Derivative Financial Instruments [Member] | Not later than one year [member] | Other Derivative Financial Instruments Asset Position [Member] | Other Derivative Financial Instruments Asset Position [Member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount   5,132,000,000
Balance sheet account receivable / (received) (payable) paid   164,000,000
Adjustment to fair value (in results / stockholders' equity)   319,000,000
Fair value   483,000,000
Other Derivative Financial Instruments [Member] | Other Derivative Financial Instruments Shares [Member] | Not later than one year [member] | Other Derivative Financial Instruments Asset Position [Member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount   202,000,000
Adjustment to fair value (in results / stockholders' equity)   8,000,000
Fair value   8,000,000
Other Derivative Financial Instruments [Member] | Other derivative financial instruments interest [member] | Not later than one year [member] | Other Derivative Financial Instruments Asset Position [Member]    
IfrsStatementLineItems [Line Items]    
Off-balance sheet notional amount   4,869,000,000
Balance sheet account receivable / (received) (payable) paid   161,000,000
Adjustment to fair value (in results / stockholders' equity)   29,000,000
Fair value   190,000,000
Other Derivative Financial Instruments [Member] | Non Deliverable Forward Asset Position Foreign Currency [Member] | Not later than one year [member] | Other Derivative Financial Instruments Asset Position [Member]    
IfrsStatementLineItems [Line Items]    
Balance sheet account receivable / (received) (payable) paid   R$ 3,000,000