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Derivatives - Summary of the Composition of Derivatives by Index (Detail) - BRL (R$)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of Financial Assets [Line Items]    
Balance sheet account receivable / (received) (payable) paid R$ (3,518,000,000) R$ (4,632,000,000)
Adjustment to market value (in results / stockholders' equity) (535,000,000) 729,000,000
Fair value (4,053,000,000) (3,903,000,000)
Assets 1 [Member]    
Disclosure of Financial Assets [Line Items]    
Balance sheet account receivable / (received) (payable) paid 15,342,000,000 16,180,000,000
Adjustment to market value (in results / stockholders' equity) 8,124,000,000 6,663,000,000
Fair value 23,466,000,000 22,843,000,000
Futures [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 586,033,000,000 607,980,000,000
Balance sheet account receivable / (received) (payable) paid   8,000,000
Adjustment to market value (in results / stockholders' equity)   150,000,000
Fair value   158,000,000
Futures [Member] | Purchase commitments [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 268,228,000,000 323,102,000,000
Balance sheet account receivable / (received) (payable) paid   8,000,000
Adjustment to market value (in results / stockholders' equity)   150,000,000
Fair value   158,000,000
Futures [Member] | Purchase commitments shares [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 13,675,000,000 18,149,000,000
Futures [Member] | Commodities [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 194,000,000 187,000,000
Futures [Member] | Purchase commitments interest [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 243,369,000,000 275,155,000,000
Balance sheet account receivable / (received) (payable) paid   7,000,000
Adjustment to market value (in results / stockholders' equity)   (3,000,000)
Fair value   4,000,000
Futures [Member] | Foreign currency [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 10,990,000,000 29,611,000,000
Balance sheet account receivable / (received) (payable) paid   1,000,000
Adjustment to market value (in results / stockholders' equity)   153,000,000
Fair value   154,000,000
Futures [Member] | Commitments to sell [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 317,805,000,000 284,878,000,000
Futures [Member] | Commitments to sell shares [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 13,965,000,000 11,359,000,000
Futures [Member] | Commodities [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 155,000,000 168,000,000
Futures [Member] | Commitments to sell interest [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 265,218,000,000 245,230,000,000
Futures [Member] | Foreign currency [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 38,467,000,000 28,121,000,000
Futures [Member] | Non-current [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 140,591,000,000 179,730,000,000
Swap [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 939,510,000,000 837,299,000,000
Balance sheet account receivable / (received) (payable) paid (5,188,000,000) (4,770,000,000)
Adjustment to market value (in results / stockholders' equity) (1,117,000,000) 268,000,000
Fair value (6,305,000,000) (4,502,000,000)
Swap [member] | Asset position [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 939,510,000,000 837,299,000,000
Balance sheet account receivable / (received) (payable) paid 6,263,000,000 3,630,000,000
Adjustment to market value (in results / stockholders' equity) 6,786,000,000 5,560,000,000
Fair value 13,049,000,000 9,190,000,000
Swap [member] | Asset position shares [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount   350,000,000
Adjustment to market value (in results / stockholders' equity)   1,000,000
Fair value   1,000,000
Swap [member] | Asset position interest [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 925,381,000,000 825,811,000,000
Balance sheet account receivable / (received) (payable) paid 5,124,000,000 2,937,000,000
Adjustment to market value (in results / stockholders' equity) 6,380,000,000 5,314,000,000
Fair value 11,504,000,000 8,251,000,000
Swap [member] | Asset position - Foreign currency [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 14,123,000,000 11,138,000,000
Balance sheet account receivable / (received) (payable) paid 1,139,000,000 693,000,000
Adjustment to market value (in results / stockholders' equity) 406,000,000 245,000,000
Fair value 1,545,000,000 938,000,000
Swap [member] | Liability position [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 939,510,000,000 837,299,000,000
Balance sheet account receivable / (received) (payable) paid (11,451,000,000) (8,400,000,000)
Adjustment to market value (in results / stockholders' equity) (7,903,000,000) (5,292,000,000)
Fair value (19,354,000,000) (13,692,000,000)
Swap [member] | Liability position shares [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 76,000,000 1,088,000,000
Balance sheet account receivable / (received) (payable) paid (5,000,000) (1,000,000)
Adjustment to market value (in results / stockholders' equity) 2,000,000  
Fair value (3,000,000) (1,000,000)
Swap [member] | Liability position interest [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 913,745,000,000 814,141,000,000
Balance sheet account receivable / (received) (payable) paid (9,410,000,000) (8,244,000,000)
Adjustment to market value (in results / stockholders' equity) (7,973,000,000) (5,275,000,000)
Fair value (17,383,000,000) (13,519,000,000)
Swap [member] | Foreign currency [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 25,069,000,000 22,070,000,000
Balance sheet account receivable / (received) (payable) paid (2,036,000,000) (155,000,000)
Adjustment to market value (in results / stockholders' equity) 69,000,000 (17,000,000)
Fair value (1,967,000,000) (172,000,000)
Swap [member] | Commodities [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 6,000,000  
Swap [member] | Non-current [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 676,104,000,000 548,686,000,000
Option contract [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 1,262,568,000,000 1,847,829,000,000
Balance sheet account receivable / (received) (payable) paid   452,000,000
Adjustment to market value (in results / stockholders' equity)   92,000,000
Fair value   544,000,000
Option contract [member] | Purchase commitments shares [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 1,262,568,000,000  
Balance sheet account receivable / (received) (payable) paid 324,000,000  
Adjustment to market value (in results / stockholders' equity) (38,000,000)  
Fair value 286,000,000  
Option contract [member] | Non-current [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 206,072,000,000 681,495,000,000
Option contract [member] | Non-current [Member] | Purchase commitments [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 151,179,000,000 245,514,000,000
Balance sheet account receivable / (received) (payable) paid 1,935,000,000 1,256,000,000
Adjustment to market value (in results / stockholders' equity) (108,000,000) 392,000,000
Fair value 1,827,000,000 1,648,000,000
Option contract [member] | Non-current [Member] | Purchase commitments shares [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 8,211,000,000 8,655,000,000
Balance sheet account receivable / (received) (payable) paid 289,000,000 396,000,000
Adjustment to market value (in results / stockholders' equity) 100,000,000 618,000,000
Fair value 389,000,000 1,014,000,000
Option contract [member] | Non-current [Member] | Commodities [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 321,000,000 367,000,000
Balance sheet account receivable / (received) (payable) paid 10,000,000 11,000,000
Adjustment to market value (in results / stockholders' equity) (3,000,000) 18,000,000
Fair value 7,000,000 29,000,000
Option contract [member] | Non-current [Member] | Purchase commitments interest [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 100,338,000,000 204,674,000,000
Balance sheet account receivable / (received) (payable) paid 183,000,000 202,000,000
Adjustment to market value (in results / stockholders' equity) (98,000,000) (44,000,000)
Fair value 85,000,000 158,000,000
Option contract [member] | Non-current [Member] | Foreign currency [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 42,309,000,000 31,818,000,000
Balance sheet account receivable / (received) (payable) paid 1,453,000,000 647,000,000
Adjustment to market value (in results / stockholders' equity) (107,000,000) (200,000,000)
Fair value 1,346,000,000 447,000,000
Option contract [member] | Non-current [Member] | Commitments to sell [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 495,464,000,000 736,856,000,000
Balance sheet account receivable / (received) (payable) paid 1,808,000,000 1,457,000,000
Adjustment to market value (in results / stockholders' equity) 580,000,000 232,000,000
Fair value 2,388,000,000 1,689,000,000
Option contract [member] | Non-current [Member] | Commitments to sell shares [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 10,802,000,000 11,795,000,000
Balance sheet account receivable / (received) (payable) paid 394,000,000 358,000,000
Adjustment to market value (in results / stockholders' equity) 500,000,000 34,000,000
Fair value 894,000,000 392,000,000
Option contract [member] | Non-current [Member] | Commodities [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 278,000,000 269,000,000
Balance sheet account receivable / (received) (payable) paid 11,000,000 4,000,000
Adjustment to market value (in results / stockholders' equity) 1,000,000  
Fair value 12,000,000 4,000,000
Option contract [member] | Non-current [Member] | Commitments to sell interest [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 441,673,000,000 700,658,000,000
Balance sheet account receivable / (received) (payable) paid 427,000,000 416,000,000
Adjustment to market value (in results / stockholders' equity) 460,000,000 348,000,000
Fair value 887,000,000 764,000,000
Option contract [member] | Non-current [Member] | Foreign currency [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 42,711,000,000 24,134,000,000
Balance sheet account receivable / (received) (payable) paid 976,000,000 679,000,000
Adjustment to market value (in results / stockholders' equity) (381,000,000) (150,000,000)
Fair value 595,000,000 529,000,000
Option contract [member] | Up to one year [Member] | Purchase commitments [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 116,005,000,000 88,688,000,000
Balance sheet account receivable / (received) (payable) paid (1,564,000,000) (1,008,000,000)
Adjustment to market value (in results / stockholders' equity) 153,000,000 (229,000,000)
Fair value (1,411,000,000) (1,237,000,000)
Option contract [member] | Up to one year [Member] | Purchase commitments shares [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 9,716,000,000 9,159,000,000
Balance sheet account receivable / (received) (payable) paid (184,000,000) (128,000,000)
Adjustment to market value (in results / stockholders' equity) (98,000,000) (527,000,000)
Fair value (282,000,000) (655,000,000)
Option contract [member] | Up to one year [Member] | Commodities [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 317,000,000 278,000,000
Balance sheet account receivable / (received) (payable) paid (9,000,000) (6,000,000)
Adjustment to market value (in results / stockholders' equity) 6,000,000 (14,000,000)
Fair value (3,000,000) (20,000,000)
Option contract [member] | Up to one year [Member] | Purchase commitments interest [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 69,934,000,000 51,477,000,000
Balance sheet account receivable / (received) (payable) paid (147,000,000) (155,000,000)
Adjustment to market value (in results / stockholders' equity) 95,000,000 65,000,000
Fair value (52,000,000) (90,000,000)
Option contract [member] | Up to one year [Member] | Foreign currency [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 36,038,000,000 27,774,000,000
Balance sheet account receivable / (received) (payable) paid (1,224,000,000) (719,000,000)
Adjustment to market value (in results / stockholders' equity) 150,000,000 247,000,000
Fair value (1,074,000,000) (472,000,000)
Option contract [member] | Up to one year [Member] | Commitments to sell [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 499,920,000,000 776,771,000,000
Balance sheet account receivable / (received) (payable) paid (1,855,000,000) (1,253,000,000)
Adjustment to market value (in results / stockholders' equity) (663,000,000) (303,000,000)
Fair value (2,518,000,000) (1,556,000,000)
Option contract [member] | Up to one year [Member] | Commitments to sell shares [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 8,898,000,000 10,241,000,000
Balance sheet account receivable / (received) (payable) paid (246,000,000) (261,000,000)
Adjustment to market value (in results / stockholders' equity) (503,000,000) (33,000,000)
Fair value (749,000,000) (294,000,000)
Option contract [member] | Up to one year [Member] | Commodities [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 192,000,000 222,000,000
Balance sheet account receivable / (received) (payable) paid (6,000,000) (8,000,000)
Adjustment to market value (in results / stockholders' equity) (2,000,000) 4,000,000
Fair value (8,000,000) (4,000,000)
Option contract [member] | Up to one year [Member] | Commitments to sell interest [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 448,029,000,000 742,475,000,000
Balance sheet account receivable / (received) (payable) paid (528,000,000) (435,000,000)
Adjustment to market value (in results / stockholders' equity) (497,000,000) (378,000,000)
Fair value (1,025,000,000) (813,000,000)
Option contract [member] | Up to one year [Member] | Foreign currency [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 42,801,000,000 23,833,000,000
Balance sheet account receivable / (received) (payable) paid (1,075,000,000) (549,000,000)
Adjustment to market value (in results / stockholders' equity) 339,000,000 104,000,000
Fair value (736,000,000) (445,000,000)
Forward [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 2,341,000,000 9,954,000,000
Balance sheet account receivable / (received) (payable) paid   639,000,000
Fair value   639,000,000
Forward [member] | Purchases receivable [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount   1,654,000,000
Balance sheet account receivable / (received) (payable) paid   1,861,000,000
Fair value   1,861,000,000
Forward [member] | Purchases receivable shares [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount   25,000,000
Balance sheet account receivable / (received) (payable) paid   25,000,000
Fair value   25,000,000
Forward [member] | Purchases receivable interest [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount   1,629,000,000
Balance sheet account receivable / (received) (payable) paid   1,836,000,000
Fair value   1,836,000,000
Forward [member] | Purchases payable interest [member]    
Disclosure of Financial Assets [Line Items]    
Balance sheet account receivable / (received) (payable) paid   (1,644,000,000)
Fair value   (1,644,000,000)
Forward [member] | Sales receivable [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount   737,000,000
Balance sheet account receivable / (received) (payable) paid   5,049,000,000
Adjustment to market value (in results / stockholders' equity)   1,000,000
Fair value   5,050,000,000
Forward [member] | Sales receivable shares [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount   737,000,000
Balance sheet account receivable / (received) (payable) paid   729,000,000
Adjustment to market value (in results / stockholders' equity)   1,000,000
Fair value   730,000,000
Forward [member] | Sales receivable interest [member]    
Disclosure of Financial Assets [Line Items]    
Balance sheet account receivable / (received) (payable) paid   4,320,000,000
Fair value   4,320,000,000
Forward [member] | Sales deliverable [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount   7,563,000,000
Balance sheet account receivable / (received) (payable) paid   (4,627,000,000)
Adjustment to market value (in results / stockholders' equity)   (1,000,000)
Fair value   (4,628,000,000)
Forward [member] | Sales deliverable shares [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount   3,261,000,000
Balance sheet account receivable / (received) (payable) paid   1,000,000
Fair value   1,000,000
Forward [member] | Sales deliverable interest [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount   4,302,000,000
Balance sheet account receivable / (received) (payable) paid   (4,628,000,000)
Adjustment to market value (in results / stockholders' equity)   (1,000,000)
Fair value   (4,629,000,000)
Forward [member] | Up to one year [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 2,341,000,000  
Balance sheet account receivable / (received) (payable) paid 1,363,000,000  
Adjustment to market value (in results / stockholders' equity) 2,000,000  
Fair value 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 36,000,000  
Balance sheet account receivable / (received) (payable) paid 36,000,000  
Fair value 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 379,000,000  
Balance sheet account receivable / (received) (payable) paid 460,000,000  
Fair value 460,000,000  
Purchases payable [Member] | Up to one year [Member]    
Disclosure of Financial Assets [Line Items]    
Balance sheet account receivable / (received) (payable) paid (381,000,000)  
Fair value (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 (379,000,000)  
Fair value (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)  
Sales receivable interest [member] | Up to one year [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 1,307,000,000  
Balance sheet account receivable / (received) (payable) paid 1,337,000,000  
Adjustment to market value (in results / stockholders' equity) 2,000,000  
Fair value 1,339,000,000  
Sales receivable interest [member] | Up to one year [Member] | Sales receivable shares [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 1,307,000,000  
Balance sheet account receivable / (received) (payable) paid 1,292,000,000  
Adjustment to market value (in results / stockholders' equity) 2,000,000  
Fair value 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 45,000,000  
Fair value 45,000,000  
Credit derivatives [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 8,324,000,000 10,110,000,000
Balance sheet account receivable / (received) (payable) paid   (30,000,000)
Adjustment to market value (in results / stockholders' equity)   109,000,000
Fair value   79,000,000
Credit derivatives [Member] | Non-current [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 6,456,000,000 8,370,000,000
Credit derivatives [Member] | Up to one year [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 8,324,000,000  
Balance sheet account receivable / (received) (payable) paid (243,000,000)  
Adjustment to market value (in results / stockholders' equity) 223,000,000  
Fair value (20,000,000)  
Credit derivatives [Member] | Asset position [Member] | Asset position [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount   5,831,000,000
Balance sheet account receivable / (received) (payable) paid   38,000,000
Adjustment to market value (in results / stockholders' equity)   99,000,000
Fair value   137,000,000
Credit derivatives [Member] | Asset position [Member] | Credit derivatives asset position shares [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount   1,955,000,000
Balance sheet account receivable / (received) (payable) paid   22,000,000
Adjustment to market value (in results / stockholders' equity)   69,000,000
Fair value   91,000,000
Credit derivatives [Member] | Asset position [Member] | Credit derivatives asset position interest [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount   3,876,000,000
Balance sheet account receivable / (received) (payable) paid   16,000,000
Adjustment to market value (in results / stockholders' equity)   30,000,000
Fair value   46,000,000
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 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] | Credit derivatives asset position shares [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 1,576,000,000  
Balance sheet account receivable / (received) (payable) paid (44,000,000)  
Adjustment to market value (in results / stockholders' equity) 136,000,000  
Fair value 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 2,249,000,000  
Balance sheet account receivable / (received) (payable) paid (43,000,000)  
Adjustment to market value (in results / stockholders' equity) 71,000,000  
Fair value 28,000,000  
Non deliverable forward [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount   252,628,000,000
Balance sheet account receivable / (received) (payable) paid   (948,000,000)
Adjustment to market value (in results / stockholders' equity)   153,000,000
Fair value   (795,000,000)
Non deliverable forward [member] | Asset position [Member] | Asset position [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount   119,312,000,000
Balance sheet account receivable / (received) (payable) paid   2,781,000,000
Adjustment to market value (in results / stockholders' equity)   169,000,000
Fair value   2,950,000,000
Non deliverable forward [member] | Asset position [Member] | Commodities [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount   80,000,000
Balance sheet account receivable / (received) (payable) paid   6,000,000
Adjustment to market value (in results / stockholders' equity)   1,000,000
Fair value   7,000,000
Non deliverable forward [member] | Asset position [Member] | Foreign currency [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount   119,232,000,000
Balance sheet account receivable / (received) (payable) paid   2,775,000,000
Adjustment to market value (in results / stockholders' equity)   168,000,000
Fair value   2,943,000,000
Non deliverable forward [member] | Asset position [Member] | Up to one year [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 225,355,000,000  
Balance sheet account receivable / (received) (payable) paid 99,000,000  
Adjustment to market value (in results / stockholders' equity) 228,000,000  
Fair value 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 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] | Commodities [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 167,000,000  
Balance sheet account receivable / (received) (payable) paid 16,000,000  
Adjustment to market value (in results / stockholders' equity) 1,000,000  
Fair value 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 122,328,000,000  
Balance sheet account receivable / (received) (payable) paid 3,362,000,000  
Adjustment to market value (in results / stockholders' equity) 332,000,000  
Fair value 3,694,000,000  
Check of swap [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 1,334,000,000 955,000,000
Balance sheet account receivable / (received) (payable) paid   (73,000,000)
Adjustment to market value (in results / stockholders' equity)   19,000,000
Fair value   (54,000,000)
Check of swap [Member] | Asset position - Foreign currency [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount   514,000,000
Adjustment to market value (in results / stockholders' equity)   68,000,000
Fair value   68,000,000
Check of swap [Member] | Liability position interest [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount   441,000,000
Balance sheet account receivable / (received) (payable) paid   (73,000,000)
Adjustment to market value (in results / stockholders' equity)   (49,000,000)
Fair value   (122,000,000)
Check of swap [Member] | Non-current [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 1,219,000,000 662,000,000
Check of swap [Member] | Up to one year [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 1,334,000,000  
Balance sheet account receivable / (received) (payable) paid (71,000,000)  
Adjustment to market value (in results / stockholders' equity) (47,000,000)  
Fair value (118,000,000)  
Check of swap [Member] | Up to one year [Member] | Asset position [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 115,000,000  
Balance sheet account receivable / (received) (payable) paid 7,000,000  
Adjustment to market value (in results / stockholders' equity) 37,000,000  
Fair value 44,000,000  
Check of swap [Member] | Up to one year [Member] | Asset position interest [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 115,000,000  
Balance sheet account receivable / (received) (payable) paid 2,000,000  
Adjustment to market value (in results / stockholders' equity) 21,000,000  
Fair value 23,000,000  
Check of swap [Member] | Up to one year [Member] | Asset position - Foreign currency [Member]    
Disclosure of Financial Assets [Line Items]    
Balance sheet account receivable / (received) (payable) paid 5,000,000  
Adjustment to market value (in results / stockholders' equity) 16,000,000  
Fair value 21,000,000  
Check of swap [Member] | Up to one year [Member] | Liability position [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 1,219,000,000  
Balance sheet account receivable / (received) (payable) paid (78,000,000)  
Adjustment to market value (in results / stockholders' equity) (84,000,000)  
Fair value (162,000,000)  
Check of swap [Member] | Up to one year [Member] | Liability position interest [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 1,219,000,000  
Balance sheet account receivable / (received) (payable) paid (17,000,000)  
Adjustment to market value (in results / stockholders' equity) (6,000,000)  
Fair value (23,000,000)  
Check of swap [Member] | Up to one year [Member] | Foreign currency [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 0  
Balance sheet account receivable / (received) (payable) paid (61,000,000)  
Adjustment to market value (in results / stockholders' equity) (78,000,000)  
Fair value (139,000,000)  
Other derivative financial instruments [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 5,304,000,000 4,225,000,000
Balance sheet account receivable / (received) (payable) paid   90,000,000
Adjustment to market value (in results / stockholders' equity)   (62,000,000)
Fair value   28,000,000
Other derivative financial instruments [Member] | Non-current [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 4,534,000,000 2,900,000,000
Other derivative financial instruments [Member] | Liability position [Member] | Up to one year [Member] | Liability position [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)  
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 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)  
Other derivative financial instruments [Member] | Liability position [Member] | Up to one year [Member] | Other derivative financial instruments interest [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 158,000,000  
Balance sheet account receivable / (received) (payable) paid (2,000,000)  
Adjustment to market value (in results / stockholders' equity) (21,000,000)  
Fair value (23,000,000)  
Other derivative financial instruments [Member] | Liability position [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)  
Other derivative financial instruments [Member] | Asset position [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount   126,000,000
Adjustment to market value (in results / stockholders' equity)   2,000,000
Fair value   2,000,000
Other derivative financial instruments [Member] | Asset position [Member] | Asset position [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount   2,464,000,000
Balance sheet account receivable / (received) (payable) paid   100,000,000
Adjustment to market value (in results / stockholders' equity)   (8,000,000)
Fair value   92,000,000
Other derivative financial instruments [Member] | Asset position [Member] | Other derivative financial instruments shares [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount   191,000,000
Balance sheet account receivable / (received) (payable) paid   (9,000,000)
Adjustment to market value (in results / stockholders' equity)   5,000,000
Fair value   (4,000,000)
Other derivative financial instruments [Member] | Asset position [Member] | Other derivative financial instruments interest [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount   2,147,000,000
Balance sheet account receivable / (received) (payable) paid   109,000,000
Adjustment to market value (in results / stockholders' equity)   (15,000,000)
Fair value   94,000,000
Sales deliverable [Member] | Up to one year [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 619,000,000  
Balance sheet account receivable / (received) (payable) paid (89,000,000)  
Fair value (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 2,000,000  
Balance sheet account receivable / (received) (payable) paid (2,000,000)  
Fair value (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 572,000,000  
Liability position [Member] | Credit derivatives [Member] | Liability position [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount   4,279,000,000
Balance sheet account receivable / (received) (payable) paid   (68,000,000)
Adjustment to market value (in results / stockholders' equity)   10,000,000
Fair value   (58,000,000)
Liability position [Member] | Credit derivatives [Member] | Credit derivatives liability position shares [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount   769,000,000
Balance sheet account receivable / (received) (payable) paid   (21,000,000)
Adjustment to market value (in results / stockholders' equity)   4,000,000
Fair value   (17,000,000)
Liability position [Member] | Credit derivatives [Member] | Credit derivatives liability position interest [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount   3,510,000,000
Balance sheet account receivable / (received) (payable) paid   (47,000,000)
Adjustment to market value (in results / stockholders' equity)   6,000,000
Fair value   (41,000,000)
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 4,499,000,000  
Balance sheet account receivable / (received) (payable) paid (156,000,000)  
Adjustment to market value (in results / stockholders' equity) 16,000,000  
Fair value (140,000,000)  
Liability position [Member] | Credit derivatives [Member] | Up to one year [Member] | Credit derivatives liability position shares [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 1,316,000,000  
Balance sheet account receivable / (received) (payable) paid (55,000,000)  
Adjustment to market value (in results / stockholders' equity) (14,000,000)  
Fair value (69,000,000)  
Liability position [Member] | Non deliverable forward [member] | Up to one year [Member] | Credit derivatives liability position interest [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 3,183,000,000  
Balance sheet account receivable / (received) (payable) paid (101,000,000)  
Adjustment to market value (in results / stockholders' equity) 30,000,000  
Fair value (71,000,000)  
Liability position [Member] | Non deliverable forward [member] | Liability position [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount   133,316,000,000
Balance sheet account receivable / (received) (payable) paid   (3,729,000,000)
Adjustment to market value (in results / stockholders' equity)   (16,000,000)
Fair value   (3,745,000,000)
Liability position [Member] | Non deliverable forward [member] | Commodities [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount   175,000,000
Balance sheet account receivable / (received) (payable) paid   (14,000,000)
Fair value   (14,000,000)
Liability position [Member] | Non deliverable forward [member] | Foreign currency [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount   133,141,000,000
Balance sheet account receivable / (received) (payable) paid   (3,715,000,000)
Adjustment to market value (in results / stockholders' equity)   (16,000,000)
Fair value   (3,731,000,000)
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 102,860,000,000  
Balance sheet account receivable / (received) (payable) paid (3,279,000,000)  
Adjustment to market value (in results / stockholders' equity) (105,000,000)  
Fair value (3,384,000,000)  
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 96,000,000  
Balance sheet account receivable / (received) (payable) paid (6,000,000)  
Adjustment to market value (in results / stockholders' equity) 1,000,000  
Fair value (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]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount   30,000,000
Balance sheet account receivable / (received) (payable) paid   (7,000,000)
Adjustment to market value (in results / stockholders' equity)   5,000,000
Fair value   (2,000,000)
Liability position [Member] | Other derivative financial instruments [Member] | Liability position [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount   1,761,000,000
Balance sheet account receivable / (received) (payable) paid   (10,000,000)
Adjustment to market value (in results / stockholders' equity)   (54,000,000)
Fair value   (64,000,000)
Liability position [Member] | Other derivative financial instruments [Member] | Other derivative financial instruments shares [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount   1,404,000,000
Balance sheet account receivable / (received) (payable) paid   (1,000,000)
Adjustment to market value (in results / stockholders' equity)   (57,000,000)
Fair value   (58,000,000)
Liability position [Member] | Other derivative financial instruments [Member] | Other derivative financial instruments interest [member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount   327,000,000
Balance sheet account receivable / (received) (payable) paid   (2,000,000)
Adjustment to market value (in results / stockholders' equity)   (2,000,000)
Fair value   (4,000,000)
Liability position [Member]    
Disclosure of Financial Assets [Line Items]    
Balance sheet account receivable / (received) (payable) paid (18,860,000,000) (20,812,000,000)
Adjustment to market value (in results / stockholders' equity) (8,659,000,000) (5,934,000,000)
Fair value (27,519,000,000) R$ (26,746,000,000)
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] | Other derivative financial instruments [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  
Asset position [Member] | Other derivative financial instruments [Member] | Up to one year [Member] | Asset position [Member]    
Disclosure of Financial Assets [Line Items]    
Off-balance sheet notional amount 4,296,000,000  
Balance sheet account receivable / (received) (payable) paid 205,000,000  
Adjustment to market value (in results / stockholders' equity) 287,000,000  
Fair value 492,000,000  
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 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 278,000,000  
Asset 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 5,000,000  
Adjustment to market value (in results / stockholders' equity) 212,000,000  
Fair value R$ 212,000,000