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Derivatives - Summary of the Composition of Derivatives by Index (Detail) - BRL (R$) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Disclosure of Financial Assets [Line Items] |  |
Balance sheet account receivable / (received) (payable) paid | R$ (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 |

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