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Derivative financial instruments - Summary of the Derivative financial instruments portfolio (assets and liabilities) by type of instrument (Detail) - BRL (R$)
R$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about financial instruments [line items]      
Derivative financial assets, notional amount R$ 385,135,262 R$ 520,217,621 R$ 88,689,738
Derivative financial liabilities, notional amount 446,351,074 492,067,822 86,580,121
Derivative financial assets 8,514,793 4,085,004 1,692,031
Derivative financial liabilities R$ 7,526,075 R$ 3,229,236 R$ 991,399
Percentage of derivative financial assets 100.00% 100.00% 100.00%
Percentage of derivative financial liabilities 100.00% 100.00% 100.00%
Not later than three months [member]      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial assets R$ 3,551,625 R$ 2,028,463 R$ 628,432
Derivative financial liabilities 2,513,265 1,763,063 153,152
From 3 to 12 months [member]      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial assets 2,498,360 1,306,020 471,882
Derivative financial liabilities 2,441,147 678,405 242,506
Later than one year [member]      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial assets 2,464,808 750,521 591,717
Derivative financial liabilities 2,571,663 787,768 595,741
Swap contract [member]      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial assets, notional amount 3,864,467 3,955,473 3,454,728
Derivative financial liabilities, notional amount 2,915,357 3,420,857 3,981,304
Derivative financial assets 789,707 1,133,768 244,262
Derivative financial liabilities R$ 425,108 R$ 485,164 R$ 247,732
Percentage of derivative financial assets 8.00% 27.00% 14.00%
Percentage of derivative financial liabilities 6.00% 14.00% 25.00%
Swap contract [member] | Not later than three months [member]      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial assets R$ 392,631 R$ 10,418 R$ 4,675
Derivative financial liabilities 22,309 15,838 7,710
Swap contract [member] | From 3 to 12 months [member]      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial assets 11,953 700,668 25,054
Derivative financial liabilities 13,866 40,687 25,094
Swap contract [member] | Later than one year [member]      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial assets 385,123 422,682 214,533
Derivative financial liabilities 388,933 428,639 214,928
Forward contract [member]      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial assets, notional amount 707,973 1,857,542 809,202
Derivative financial liabilities, notional amount 4,223,982 164,209 19,142
Derivative financial assets 567,259 187,392 573,963
Derivative financial liabilities R$ 631,912 R$ 2,480 R$ 17,170
Percentage of derivative financial assets 7.00% 5.00% 34.00%
Percentage of derivative financial liabilities 8.00% 1.00% 2.00%
Forward contract [member] | Not later than three months [member]      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial assets R$ 545,521 R$ 159,163 R$ 363,863
Derivative financial liabilities 558,697 1,693 16,972
Forward contract [member] | From 3 to 12 months [member]      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial assets 3,679 28,175 210,100
Derivative financial liabilities 73,152 325 25
Forward contract [member] | Later than one year [member]      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial assets 18,059 54  
Derivative financial liabilities 63 462 173
Futures contract [member]      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial assets, notional amount 6,201 15,920,584 5,679,425
Derivative financial assets R$ 1,216 R$ 21,809 R$ 6,599
Percentage of derivative financial assets 1.00% 1.00% 1.00%
Futures contract [member] | Not later than three months [member]      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial assets R$ 1,216 R$ 21,809 R$ 4,613
Futures contract [member] | From 3 to 12 months [member]      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial assets     1,986
Option contract [member]      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial assets, notional amount 380,556,621 498,484,022 78,746,383
Derivative financial liabilities, notional amount 439,211,735 488,482,756 82,579,675
Derivative financial assets 7,156,611 2,742,035 867,207
Derivative financial liabilities R$ 6,469,055 R$ 2,741,592 R$ 726,497
Percentage of derivative financial assets 84.00% 67.00% 51.00%
Percentage of derivative financial liabilities 86.00% 85.00% 73.00%
Option contract [member] | Not later than three months [member]      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial assets R$ 2,612,257 R$ 1,837,073 R$ 255,281
Derivative financial liabilities 1,932,259 1,745,532 128,470
Option contract [member] | From 3 to 12 months [member]      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial assets 2,482,728 577,177 234,742
Derivative financial liabilities 2,354,129 637,393 217,387
Option contract [member] | Later than one year [member]      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial assets 2,061,626 327,785 377,184
Derivative financial liabilities R$ 2,182,667 R$ 358,667 R$ 380,640