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Derivatives - Summary of the Composition of Derivatives by Index (Detail) - BRL (R$)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount R$ 20,000,000  
Balance sheet account receivable / (received) (payable) paid (4,973,000,000) R$ (3,518,000,000)
Adjustment to market value (in results / stockholders' equity) (1,001,000,000) (535,000,000)
Fair value (5,974,000,000) (4,053,000,000)
Purchase commitments interest [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 301,898,000,000  
Foreign currency [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 22,410,000,000  
Commitments to sell [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 339,416,000,000  
Commitments to sell shares [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 1,163,000,000  
Commodities [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 1,049,000,000  
Commitments to sell interest [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 308,824,000,000  
Foreign currency [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 28,380,000,000  
Up to one year [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 1,153,000,000  
Balance sheet account receivable / (received) (payable) paid (10,000,000)  
Adjustment to market value (in results / stockholders' equity) (65,000,000)  
Fair value (75,000,000)  
Up to one year [member] | Purchases receivable [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 668,000,000  
Balance sheet account receivable / (received) (payable) paid 796,000,000  
Adjustment to market value (in results / stockholders' equity) (6,000,000)  
Fair value 790,000,000  
Up to one year [member] | Sales receivable [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 1,653,000,000 1,307,000,000
Balance sheet account receivable / (received) (payable) paid 1,368,000,000 1,337,000,000
Adjustment to market value (in results / stockholders' equity) 4,000,000 2,000,000
Fair value 1,372,000,000 1,339,000,000
Assets 1 [Member]    
Disclosure of Financial Assets [Line Items]    
Balance sheet account receivable / (received) (payable) paid 19,888,000,000 15,342,000,000
Adjustment to market value (in results / stockholders' equity) 21,966,000,000 8,124,000,000
Fair value 41,854,000,000 23,466,000,000
Futures [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 664,884,000,000 586,033,000,000
Futures [Member] | Purchase commitments [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 325,468,000,000 268,228,000,000
Futures [Member] | Purchase commitments shares [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 1,084,000,000 13,675,000,000
Futures [Member] | Commodities [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 76,000,000 194,000,000
Futures [Member] | Purchase commitments interest [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount   243,369,000,000
Futures [Member] | Foreign currency [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount   10,990,000,000
Futures [Member] | Commitments to sell [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount   317,805,000,000
Futures [Member] | Commitments to sell shares [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount   13,965,000,000
Futures [Member] | Commodities [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount   155,000,000
Futures [Member] | Commitments to sell interest [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount   265,218,000,000
Futures [Member] | Foreign currency [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount   38,467,000,000
Futures [Member] | Non-current [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 142,597,000,000 140,591,000,000
Swap [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 1,094,378,000,000 940,844,000,000
Balance sheet account receivable / (received) (payable) paid (5,267,000,000) (5,259,000,000)
Adjustment to market value (in results / stockholders' equity) (1,202,000,000) (1,164,000,000)
Fair value (6,469,000,000) (6,423,000,000)
Swap [member] | Asset position [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 1,094,378,000,000 940,844,000,000
Balance sheet account receivable / (received) (payable) paid 5,566,000,000 6,270,000,000
Adjustment to market value (in results / stockholders' equity) 20,892,000,000 6,823,000,000
Fair value 26,458,000,000 13,093,000,000
Swap [member] | Asset position interest [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 1,075,534,000,000 925,381,000,000
Balance sheet account receivable / (received) (payable) paid 4,596,000,000 5,126,000,000
Adjustment to market value (in results / stockholders' equity) 19,813,000,000 6,401,000,000
Fair value 24,409,000,000 11,527,000,000
Swap [member] | Asset position - Foreign currency [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 18,270,000,000 15,457,000,000
Balance sheet account receivable / (received) (payable) paid 970,000,000 1,144,000,000
Adjustment to market value (in results / stockholders' equity) 1,070,000,000 422,000,000
Fair value 2,040,000,000 1,566,000,000
Swap [member] | Liability position [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 1,094,378,000,000 940,844,000,000
Balance sheet account receivable / (received) (payable) paid (10,833,000,000) (11,529,000,000)
Adjustment to market value (in results / stockholders' equity) (22,094,000,000) (7,987,000,000)
Fair value (32,927,000,000) (19,516,000,000)
Swap [member] | Liability position shares [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 49,000,000 76,000,000
Balance sheet account receivable / (received) (payable) paid (9,000,000) (5,000,000)
Adjustment to market value (in results / stockholders' equity)   2,000,000
Fair value (9,000,000) (3,000,000)
Swap [member] | Liability position interest [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 1,068,660,000,000 915,079,000,000
Balance sheet account receivable / (received) (payable) paid (9,383,000,000) (9,427,000,000)
Adjustment to market value (in results / stockholders' equity) (21,855,000,000) (7,979,000,000)
Fair value (31,238,000,000) (17,406,000,000)
Swap [member] | Foreign currency [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 24,814,000,000 25,069,000,000
Balance sheet account receivable / (received) (payable) paid (1,441,000,000) (2,097,000,000)
Adjustment to market value (in results / stockholders' equity) (227,000,000) (9,000,000)
Fair value (1,668,000,000) (2,106,000,000)
Swap [member] | Commodities [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 574,000,000 6,000,000
Adjustment to market value (in results / stockholders' equity) 9,000,000  
Fair value 9,000,000  
Swap [member] | Commodities [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 855,000,000  
Adjustment to market value (in results / stockholders' equity) (12,000,000)  
Fair value (12,000,000)  
Swap [member] | Non-current [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 763,206,000,000 677,323,000,000
Option contract [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 1,720,205,000,000 1,262,568,000,000
Balance sheet account receivable / (received) (payable) paid (546,000,000) 324,000,000
Adjustment to market value (in results / stockholders' equity) (59,000,000) (38,000,000)
Fair value (605,000,000) 286,000,000
Option contract [member] | Non-current [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 152,624,000,000 206,072,000,000
Option contract [member] | Non-current [Member] | Purchase commitments [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 245,824,000,000 151,179,000,000
Balance sheet account receivable / (received) (payable) paid 6,191,000,000 1,935,000,000
Adjustment to market value (in results / stockholders' equity) (6,000,000) (108,000,000)
Fair value 6,185,000,000 1,827,000,000
Option contract [member] | Non-current [Member] | Purchase commitments shares [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 11,513,000,000 8,211,000,000
Balance sheet account receivable / (received) (payable) paid 256,000,000 289,000,000
Adjustment to market value (in results / stockholders' equity) 515,000,000 100,000,000
Fair value 771,000,000 389,000,000
Option contract [member] | Non-current [Member] | Commodities [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 268,000,000 321,000,000
Balance sheet account receivable / (received) (payable) paid 7,000,000 10,000,000
Adjustment to market value (in results / stockholders' equity) 10,000,000 (3,000,000)
Fair value 17,000,000 7,000,000
Option contract [member] | Non-current [Member] | Purchase commitments interest [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 188,110,000,000 100,338,000,000
Balance sheet account receivable / (received) (payable) paid 465,000,000 183,000,000
Adjustment to market value (in results / stockholders' equity) (331,000,000) (98,000,000)
Fair value 134,000,000 85,000,000
Option contract [member] | Non-current [Member] | Foreign currency [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 45,933,000,000 42,309,000,000
Balance sheet account receivable / (received) (payable) paid 5,463,000,000 1,453,000,000
Adjustment to market value (in results / stockholders' equity) (200,000,000) (107,000,000)
Fair value 5,263,000,000 1,346,000,000
Option contract [member] | Non-current [Member] | Commitments to sell [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 626,187,000,000 495,464,000,000
Balance sheet account receivable / (received) (payable) paid 1,667,000,000 1,808,000,000
Adjustment to market value (in results / stockholders' equity) 604,000,000 580,000,000
Fair value 2,271,000,000 2,388,000,000
Option contract [member] | Non-current [Member] | Commitments to sell shares [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 12,294,000,000 10,802,000,000
Balance sheet account receivable / (received) (payable) paid 396,000,000 394,000,000
Adjustment to market value (in results / stockholders' equity) (40,000,000) 500,000,000
Fair value 356,000,000 894,000,000
Option contract [member] | Non-current [Member] | Commodities [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 228,000,000 278,000,000
Balance sheet account receivable / (received) (payable) paid 5,000,000 11,000,000
Adjustment to market value (in results / stockholders' equity) (2,000,000) 1,000,000
Fair value 3,000,000 12,000,000
Option contract [member] | Non-current [Member] | Commitments to sell interest [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 568,442,000,000 441,673,000,000
Balance sheet account receivable / (received) (payable) paid 513,000,000 427,000,000
Adjustment to market value (in results / stockholders' equity) 887,000,000 460,000,000
Fair value 1,400,000,000 887,000,000
Option contract [member] | Non-current [Member] | Foreign currency [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 45,223,000,000 42,711,000,000
Balance sheet account receivable / (received) (payable) paid 753,000,000 976,000,000
Adjustment to market value (in results / stockholders' equity) (241,000,000) (381,000,000)
Fair value 512,000,000 595,000,000
Option contract [member] | Up to one year [member] | Purchase commitments [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 172,703,000,000 116,005,000,000
Balance sheet account receivable / (received) (payable) paid (6,671,000,000) (1,564,000,000)
Adjustment to market value (in results / stockholders' equity) (19,000,000) 153,000,000
Fair value (6,690,000,000) (1,411,000,000)
Option contract [member] | Up to one year [member] | Purchase commitments shares [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 6,312,000,000 9,716,000,000
Balance sheet account receivable / (received) (payable) paid (180,000,000) (184,000,000)
Adjustment to market value (in results / stockholders' equity) (451,000,000) (98,000,000)
Fair value (631,000,000) (282,000,000)
Option contract [member] | Up to one year [member] | Commodities [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 235,000,000 317,000,000
Balance sheet account receivable / (received) (payable) paid (10,000,000) (9,000,000)
Adjustment to market value (in results / stockholders' equity) (8,000,000) 6,000,000
Fair value (18,000,000) (3,000,000)
Option contract [member] | Up to one year [member] | Purchase commitments interest [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 129,647,000,000 69,934,000,000
Balance sheet account receivable / (received) (payable) paid (412,000,000) (147,000,000)
Adjustment to market value (in results / stockholders' equity) 329,000,000 95,000,000
Fair value (83,000,000) (52,000,000)
Option contract [member] | Up to one year [member] | Foreign currency [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 36,509,000,000 36,038,000,000
Balance sheet account receivable / (received) (payable) paid (6,069,000,000) (1,224,000,000)
Adjustment to market value (in results / stockholders' equity) 111,000,000 150,000,000
Fair value (5,958,000,000) (1,074,000,000)
Option contract [member] | Up to one year [member] | Commitments to sell [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 675,491,000,000 499,920,000,000
Balance sheet account receivable / (received) (payable) paid (1,733,000,000) (1,855,000,000)
Adjustment to market value (in results / stockholders' equity) (638,000,000) (663,000,000)
Fair value (2,371,000,000) (2,518,000,000)
Option contract [member] | Up to one year [member] | Commitments to sell shares [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 11,152,000,000 8,898,000,000
Balance sheet account receivable / (received) (payable) paid (269,000,000) (246,000,000)
Adjustment to market value (in results / stockholders' equity) (37,000,000) (503,000,000)
Fair value (306,000,000) (749,000,000)
Option contract [member] | Up to one year [member] | Commodities [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 485,000,000 192,000,000
Balance sheet account receivable / (received) (payable) paid (11,000,000) (6,000,000)
Adjustment to market value (in results / stockholders' equity)   (2,000,000)
Fair value (11,000,000) (8,000,000)
Option contract [member] | Up to one year [member] | Commitments to sell interest [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 621,405,000,000 448,029,000,000
Balance sheet account receivable / (received) (payable) paid (428,000,000) (528,000,000)
Adjustment to market value (in results / stockholders' equity) (888,000,000) (497,000,000)
Fair value (1,316,000,000) (1,025,000,000)
Option contract [member] | Up to one year [member] | Foreign currency [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 42,449,000,000 42,801,000,000
Balance sheet account receivable / (received) (payable) paid (1,025,000,000) (1,075,000,000)
Adjustment to market value (in results / stockholders' equity) 287,000,000 339,000,000
Fair value (738,000,000) (736,000,000)
Forward [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 5,134,000,000 2,341,000,000
Forward [member] | Up to one year [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 5,134,000,000 2,341,000,000
Balance sheet account receivable / (received) (payable) paid 1,412,000,000 1,363,000,000
Adjustment to market value (in results / stockholders' equity) (4,000,000) 2,000,000
Fair value 1,408,000,000 1,365,000,000
Purchases receivable [Member] | Up to one year [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount   415,000,000
Balance sheet account receivable / (received) (payable) paid   496,000,000
Fair value   496,000,000
Purchases receivable [Member] | Up to one year [member] | Purchases receivable shares [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 488,000,000 36,000,000
Balance sheet account receivable / (received) (payable) paid 488,000,000 36,000,000
Adjustment to market value (in results / stockholders' equity) (6,000,000)  
Fair value 482,000,000 36,000,000
Purchases receivable [Member] | Up to one year [member] | Purchases receivable interest [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 160,000,000 379,000,000
Balance sheet account receivable / (received) (payable) paid 308,000,000 460,000,000
Fair value 308,000,000 460,000,000
Purchases payable [Member] | Up to one year [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 660,000,000  
Balance sheet account receivable / (received) (payable) paid (160,000,000) (381,000,000)
Fair value (160,000,000) (381,000,000)
Purchases payable [Member] | Up to one year [member] | Purchases payable interest [member]    
Disclosure of Financial Assets [Line Items]    
Balance sheet account receivable / (received) (payable) paid (160,000,000) (379,000,000)
Fair value (160,000,000) (379,000,000)
Purchases payable [Member] | Up to one year [member] | Purchases Payable Shares [member]    
Disclosure of Financial Assets [Line Items]    
Balance sheet account receivable / (received) (payable) paid   (2,000,000)
Fair value   (2,000,000)
Purchases payable [Member] | Up to one year [member] | Foreign currency [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 660,000,000  
Sales receivable interest [member] | Up to one year [member] | Sales receivable shares [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 786,000,000 1,307,000,000
Balance sheet account receivable / (received) (payable) paid 776,000,000 1,292,000,000
Adjustment to market value (in results / stockholders' equity) 3,000,000 2,000,000
Fair value 779,000,000 1,294,000,000
Sales receivable interest [member] | Up to one year [member] | Sales receivable interest [member]    
Disclosure of Financial Assets [Line Items]    
Balance sheet account receivable / (received) (payable) paid 592,000,000 45,000,000
Adjustment to market value (in results / stockholders' equity) 1,000,000  
Fair value 593,000,000 45,000,000
Sales receivable interest [member] | Up to one year [member] | Foreign currency [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 867,000,000  
Credit derivatives [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 12,739,000,000 8,324,000,000
Credit derivatives [Member] | Non-current [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 7,260,000,000 6,456,000,000
Credit derivatives [Member] | Up to one year [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 12,739,000,000 8,324,000,000
Balance sheet account receivable / (received) (payable) paid (236,000,000) (243,000,000)
Adjustment to market value (in results / stockholders' equity) 363,000,000 223,000,000
Fair value 127,000,000 (20,000,000)
Credit derivatives [Member] | Asset position [Member] | Up to one year [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount   3,825,000,000
Balance sheet account receivable / (received) (payable) paid   (87,000,000)
Adjustment to market value (in results / stockholders' equity)   207,000,000
Fair value   120,000,000
Credit derivatives [Member] | Asset position [Member] | Up to one year [member] | Asset position [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 9,878,000,000  
Balance sheet account receivable / (received) (payable) paid (165,000,000)  
Adjustment to market value (in results / stockholders' equity) 332,000,000  
Fair value 167,000,000  
Credit derivatives [Member] | Asset position [Member] | Up to one year [member] | Credit derivatives asset position shares [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 2,307,000,000 1,576,000,000
Balance sheet account receivable / (received) (payable) paid (81,000,000) (44,000,000)
Adjustment to market value (in results / stockholders' equity) 215,000,000 136,000,000
Fair value 134,000,000 92,000,000
Credit derivatives [Member] | Asset position [Member] | Up to one year [member] | Credit derivatives asset position interest [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 7,423,000,000 2,249,000,000
Balance sheet account receivable / (received) (payable) paid (87,000,000) (43,000,000)
Adjustment to market value (in results / stockholders' equity) 114,000,000 71,000,000
Fair value 27,000,000 28,000,000
Credit derivatives [Member] | Asset position [Member] | Up to one year [member] | Commodities [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 27,000,000  
Balance sheet account receivable / (received) (payable) paid (1,000,000)  
Adjustment to market value (in results / stockholders' equity) 3,000,000  
Fair value 2,000,000  
Credit derivatives [Member] | Asset position [Member] | Up to one year [member] | Foreign currency [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 121,000,000  
Balance sheet account receivable / (received) (payable) paid 4,000,000  
Fair value 4,000,000  
Non deliverable forward [member] | Asset position [Member] | Up to one year [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount   122,495,000,000
Balance sheet account receivable / (received) (payable) paid   3,378,000,000
Adjustment to market value (in results / stockholders' equity)   333,000,000
Fair value   3,711,000,000
Non deliverable forward [member] | Asset position [Member] | Up to one year [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 295,508,000,000 225,355,000,000
Balance sheet account receivable / (received) (payable) paid (552,000,000) 99,000,000
Adjustment to market value (in results / stockholders' equity) 27,000,000 228,000,000
Fair value (525,000,000) 327,000,000
Non deliverable forward [member] | Asset position [Member] | Up to one year [member] | Asset position [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 138,772,000,000  
Balance sheet account receivable / (received) (payable) paid 4,239,000,000  
Adjustment to market value (in results / stockholders' equity) 207,000,000  
Fair value 4,446,000,000  
Non deliverable forward [member] | Asset position [Member] | Up to one year [member] | Commodities [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 570,000,000 167,000,000
Balance sheet account receivable / (received) (payable) paid 34,000,000 16,000,000
Adjustment to market value (in results / stockholders' equity) (1,000,000) 1,000,000
Fair value 33,000,000 17,000,000
Non deliverable forward [member] | Asset position [Member] | Up to one year [member] | Foreign currency [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 138,202,000,000 122,328,000,000
Balance sheet account receivable / (received) (payable) paid 4,205,000,000 3,362,000,000
Adjustment to market value (in results / stockholders' equity) 208,000,000 332,000,000
Fair value 4,413,000,000 3,694,000,000
Other derivative financial instruments [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 6,581,000,000 5,304,000,000
Other derivative financial instruments [Member] | Non-current [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 5,463,000,000 4,534,000,000
Other derivative financial instruments [Member] | Liability position [Member] | Up to one year [member] | Other derivative financial instruments shares [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 695,000,000  
Balance sheet account receivable / (received) (payable) paid 2,000,000  
Adjustment to market value (in results / stockholders' equity) (41,000,000)  
Fair value (39,000,000)  
Other derivative financial instruments [Member] | Liability position [Member] | Up to one year [member] | Foreign currency [Member]    
Disclosure of Financial Assets [Line Items]    
Adjustment to market value (in results / stockholders' equity) (18,000,000)  
Fair value (18,000,000)  
Other derivative financial instruments [Member] | Asset position [Member] | Up to one year [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount   5,304,000,000
Balance sheet account receivable / (received) (payable) paid   198,000,000
Adjustment to market value (in results / stockholders' equity)   214,000,000
Fair value   412,000,000
Sales Deliverable [Member] | Up to one year [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 2,153,000,000 619,000,000
Balance sheet account receivable / (received) (payable) paid (592,000,000) (89,000,000)
Adjustment to market value (in results / stockholders' equity) (2,000,000)  
Fair value (594,000,000) (89,000,000)
Sales Deliverable [Member] | Up to one year [member] | Sales deliverable shares [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 592,000,000 2,000,000
Balance sheet account receivable / (received) (payable) paid (592,000,000) (2,000,000)
Adjustment to market value (in results / stockholders' equity) (1,000,000)  
Fair value (593,000,000) (2,000,000)
Sales Deliverable [Member] | Up to one year [member] | Sales deliverable interest [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount   45,000,000
Balance sheet account receivable / (received) (payable) paid   (87,000,000)
Fair value   (87,000,000)
Sales Deliverable [Member] | Up to one year [member] | Sales deliverable foreign currency [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 1,561,000,000 572,000,000
Adjustment to market value (in results / stockholders' equity) (1,000,000)  
Fair value (1,000,000)  
Liability position [Member] | Credit derivatives [Member] | Up to one year [member] | Liability position [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 2,861,000,000 4,499,000,000
Balance sheet account receivable / (received) (payable) paid (71,000,000) (156,000,000)
Adjustment to market value (in results / stockholders' equity) 31,000,000 16,000,000
Fair value (40,000,000) (140,000,000)
Liability position [Member] | Credit derivatives [Member] | Up to one year [member] | Liability position shares [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 719,000,000 1,316,000,000
Balance sheet account receivable / (received) (payable) paid (28,000,000) (55,000,000)
Adjustment to market value (in results / stockholders' equity) 8,000,000 (14,000,000)
Fair value (20,000,000) (69,000,000)
Liability position [Member] | Credit derivatives [Member] | Up to one year [member] | Liability position interest [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 2,140,000,000 3,183,000,000
Balance sheet account receivable / (received) (payable) paid (43,000,000) (101,000,000)
Adjustment to market value (in results / stockholders' equity) 23,000,000 30,000,000
Fair value (20,000,000) (71,000,000)
Liability position [Member] | Credit derivatives [Member] | Up to one year [member] | Commodities [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 2,000,000  
Liability position [Member] | Non deliverable forward [member] | Up to one year [member] | Liability position [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 156,736,000,000 102,860,000,000
Balance sheet account receivable / (received) (payable) paid (4,791,000,000) (3,279,000,000)
Adjustment to market value (in results / stockholders' equity) (180,000,000) (105,000,000)
Fair value (4,971,000,000) (3,384,000,000)
Liability position [Member] | Non deliverable forward [member] | Up to one year [member] | Foreign currency [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 156,420,000,000  
Balance sheet account receivable / (received) (payable) paid (4,781,000,000)  
Adjustment to market value (in results / stockholders' equity) (179,000,000)  
Fair value (4,960,000,000)  
Liability position [Member] | Non deliverable forward [member] | Up to one year [member] | Commodities [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 316,000,000 96,000,000
Balance sheet account receivable / (received) (payable) paid (10,000,000) (6,000,000)
Adjustment to market value (in results / stockholders' equity) (1,000,000) 1,000,000
Fair value (11,000,000) (5,000,000)
Liability position [Member] | Non deliverable forward [member] | Up to one year [member] | Foreign currency [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount   102,764,000,000
Balance sheet account receivable / (received) (payable) paid   (3,273,000,000)
Adjustment to market value (in results / stockholders' equity)   (106,000,000)
Fair value   (3,379,000,000)
Liability position [Member] | Other derivative financial instruments [Member] | Up to one year [member] | Other derivative financial instruments shares [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount   842,000,000
Balance sheet account receivable / (received) (payable) paid   (4,000,000)
Adjustment to market value (in results / stockholders' equity)   (42,000,000)
Fair value   (46,000,000)
Liability position [Member] | Other derivative financial instruments [Member] | Up to one year [member] | Other derivative financial instruments interest [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 458,000,000 158,000,000
Balance sheet account receivable / (received) (payable) paid (12,000,000) (2,000,000)
Adjustment to market value (in results / stockholders' equity) (6,000,000) (21,000,000)
Fair value (18,000,000) (23,000,000)
Liability position [Member] | Other derivative financial instruments [Member] | Up to one year [member] | Foreign currency [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount   8,000,000
Balance sheet account receivable / (received) (payable) paid   (1,000,000)
Adjustment to market value (in results / stockholders' equity)   (10,000,000)
Fair value   (11,000,000)
Liability position [Member] | Other derivative financial instruments [Member] | Liability position [Member] | Up to one year [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount   1,008,000,000
Balance sheet account receivable / (received) (payable) paid   (7,000,000)
Adjustment to market value (in results / stockholders' equity)   (73,000,000)
Fair value   (80,000,000)
Liability position [Member]    
Disclosure of Financial Assets [Line Items]    
Balance sheet account receivable / (received) (payable) paid (24,861,000,000) (18,860,000,000)
Adjustment to market value (in results / stockholders' equity) (22,967,000,000) (8,659,000,000)
Fair value (47,828,000,000) (27,519,000,000)
Commodities [member] | Swap [member] | Commodities [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount   620,000,000
Adjustment to market value (in results / stockholders' equity)   (1,000,000)
Fair value   (1,000,000)
Asset position [Member] | Asset position [Member] | Up to one year [member] | Foreign currency [Member]    
Disclosure of Financial Assets [Line Items]    
Adjustment to market value (in results / stockholders' equity) 4,000,000  
Fair value 4,000,000  
Asset position [Member] | Other derivative financial instruments [Member] | Up to one year [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 6,581,000,000  
Balance sheet account receivable / (received) (payable) paid 216,000,000  
Adjustment to market value (in results / stockholders' equity) (126,000,000)  
Fair value 90,000,000  
Asset position [Member] | Other derivative financial instruments [Member] | Up to one year [member] | Other derivative financial instruments shares [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount   217,000,000
Balance sheet account receivable / (received) (payable) paid   (8,000,000)
Adjustment to market value (in results / stockholders' equity)   10,000,000
Fair value   2,000,000
Asset position [Member] | Other derivative financial instruments [Member] | Up to one year [member] | Other derivative financial instruments interest [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 5,428,000,000  
Balance sheet account receivable / (received) (payable) paid 226,000,000  
Adjustment to market value (in results / stockholders' equity) (65,000,000)  
Fair value 161,000,000  
Asset position [Member] | Other derivative financial instruments [Member] | Asset position [Member] | Foreign currency [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount   5,000,000
Adjustment to market value (in results / stockholders' equity)   212,000,000
Fair value   212,000,000
Asset position [Member] | Other derivative financial instruments [Member] | Asset position [Member] | Up to one year [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 5,428,000,000 4,296,000,000
Balance sheet account receivable / (received) (payable) paid 226,000,000 205,000,000
Adjustment to market value (in results / stockholders' equity) (61,000,000) 287,000,000
Fair value R$ 165,000,000 492,000,000
Asset position [Member] | Other derivative financial instruments [Member] | Asset position [Member] | Up to one year [member] | Other derivative financial instruments interest [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount   4,074,000,000
Balance sheet account receivable / (received) (payable) paid   213,000,000
Adjustment to market value (in results / stockholders' equity)   65,000,000
Fair value   R$ 278,000,000