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Hedge accounting - Summary of detailed information about hedging instruments (Details) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of detailed information about hedged items [line items]      
Notional value R$ 20,967,989 R$ 18,563,230 R$ 9,738,021
Variation in the amounts used to calculate hedge ineffectiveness 34,603 17,252 (18,758)
Hedge of net investment in foreign operations      
Disclosure of detailed information about hedged items [line items]      
Assets 450,853 395,594 310,069
Liabilities 0 0 0
Variation in value recognized in Other comprehensive income (34,603) (17,281) 19,474
Notional value 446,442 414,043 440,022
Variation in the amounts used to calculate hedge ineffectiveness 41,235 18,480 (18,758)
Fair value hedge      
Disclosure of detailed information about hedged items [line items]      
Notional value 20,082,782 17,887,369 9,297,999
Cash flow hedges      
Disclosure of detailed information about hedged items [line items]      
Notional value 438,765 261,818 0
Foreign exchange risk | Hedge of net investment in foreign operations      
Disclosure of detailed information about hedged items [line items]      
Assets 450,853 395,594 310,069
Liabilities 0 0 0
Variation in value recognized in Other comprehensive income (34,603) (17,281) 19,474
Notional value 446,442 414,043 440,022
Variation in the amounts used to calculate hedge ineffectiveness 41,235 18,480 R$ (18,758)
Foreign exchange risk | Fair value hedge | Futures contract [member]      
Disclosure of detailed information about hedged items [line items]      
Assets 450,853 395,594  
Liabilities 239,472 319,715  
Notional value 670,007 697,227  
Variation in the amounts used to calculate hedge ineffectiveness 26,171 (23,903)  
Hedge ineffectiveness recognized in income 1,449 (2,825)  
Interest rate and foreign exchange risk | Fair value hedge      
Disclosure of detailed information about hedged items [line items]      
Assets 0 3,589,909  
Liabilities 20,135,697 14,538,258  
Notional value 20,082,782 17,887,369  
Variation in value recognized in income (684,961) 887,138  
Variation in the amounts used to calculate hedge ineffectiveness 659,971 (932,486)  
Interest rate and foreign exchange risk | Fair value hedge | Structured notes      
Disclosure of detailed information about hedged items [line items]      
Assets 0 0  
Liabilities 16,593,439 10,648,559  
Notional value 16,702,984 10,663,672  
Variation in value recognized in income (816,142) 726,798  
Variation in the amounts used to calculate hedge ineffectiveness 849,160 (734,656)  
Interest rate and foreign exchange risk | Fair value hedge | Issued bonds      
Disclosure of detailed information about hedged items [line items]      
Assets 0 0  
Liabilities 3,542,258 3,889,699  
Notional value 3,379,798 3,646,613  
Variation in value recognized in income 131,181 323,881  
Variation in the amounts used to calculate hedge ineffectiveness (189,189) (362,994)  
Interest rate and foreign exchange risk | Fair value hedge | Fixed income bonds      
Disclosure of detailed information about hedged items [line items]      
Assets   3,589,909  
Liabilities   0  
Notional value   3,577,084  
Variation in value recognized in income   (163,541)  
Variation in the amounts used to calculate hedge ineffectiveness   165,164  
Market price risk | Cash flow hedges      
Disclosure of detailed information about hedged items [line items]      
Assets 0 0  
Liabilities 414,315 262,756  
Variation in value recognized in Other comprehensive income (59,517) 346,900  
Notional value 438,765 261,818  
Variation in the amounts used to calculate hedge ineffectiveness 70,906 (348,248)  
Market price risk | Cash flow hedges | Long term incentive plan taxes [Member]      
Disclosure of detailed information about hedged items [line items]      
Assets 0 0  
Liabilities 414,315 262,756  
Variation in value recognized in Other comprehensive income (59,517) 346,900  
Notional value 438,765 261,818  
Variation in the amounts used to calculate hedge ineffectiveness 70,906 (348,248)  
Market price risk | Cash flow hedges | Swap contract [member]      
Disclosure of detailed information about hedged items [line items]      
Assets 0 0  
Liabilities 414,315 262,756  
Notional value 438,765 261,818  
Variation in the amounts used to calculate hedge ineffectiveness 70,906 (348,248)  
Hedge ineffectiveness recognized in income 11,389 (1,348)  
Interest rate risk | Fair value hedge | Futures contract [member]      
Disclosure of detailed information about hedged items [line items]      
Assets 0 3,589,909  
Liabilities 19,896,226 14,218,543  
Notional value 19,859,217 17,604,185  
Variation in the amounts used to calculate hedge ineffectiveness 675,035 (890,103)  
Hedge ineffectiveness recognized in income R$ (19,807) R$ (41,295)