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Derivative financial instruments - Summary of Positions with derivative financial instruments (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 R$ 8,514,793 R$ 4,085,004 R$ 1,692,031
Derivative financial assets, notional amount 385,135,262 520,217,621 88,689,738
Derivative financial liabilities 7,526,075 3,229,236 991,399
Derivative financial liabilities, notional amount 446,351,074 492,067,822 86,580,121
Swap contract [member]      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial assets 789,707 1,133,768 244,262
Derivative financial assets, notional amount 3,864,467 3,955,473 3,454,728
Derivative financial liabilities 425,108 485,164 247,732
Derivative financial liabilities, notional amount 2,915,357 3,420,857 3,981,304
Forward contract [member]      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial assets 567,259 187,392 573,963
Derivative financial assets, notional amount 707,973 1,857,542 809,202
Derivative financial liabilities 631,912 2,480 17,170
Derivative financial liabilities, notional amount 4,223,982 164,209 19,142
Futures contract [member]      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial assets 1,216 21,809 6,599
Derivative financial assets, notional amount 6,201 15,920,584 5,679,425
Option contract [member]      
Disclosure of detailed information about financial instruments [line items]      
Derivative financial assets 7,156,611 2,742,035 867,207
Derivative financial assets, notional amount 380,556,621 498,484,022 78,746,383
Derivative financial liabilities 6,469,055 2,741,592 726,497
Derivative financial liabilities, notional amount R$ 439,211,735 R$ 488,482,756 R$ 82,579,675