The value of the collateral (typically cash) that the entity receives in a financing transaction in exchange for securities lent. This item represents a liability in the financial statements of the lender of the securities.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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SECURITIZATION TRANSACTIONS - Collateralized Debt (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Collateralized debt	$ 1,481	$ 1,475
Mercado Crédito I Brasil Fundo de Investimento Em Direitos Creditórios Não Padronizados
Debt Instrument [Line Items]
Collateralized debt	181
Mercado Crédito Fundo de Investimento Em Direitos Creditórios Não Padronizado
Debt Instrument [Line Items]
Collateralized debt	16
Olimpia Fundo de Investimento Em Direitos Creditórios
Debt Instrument [Line Items]
Collateralized debt	75
Mercado Crédito II Brasil Fundo De Investimento Em Direitos Creditórios Nao Padronizados
Debt Instrument [Line Items]
Collateralized debt	215
Seller Fundo De Investimento Em Direitos Creditórios
Debt Instrument [Line Items]
Collateralized debt	183
Seller Fundo De Investimento Em Direitos Creditórios
Debt Instrument [Line Items]
Collateralized debt	91
Seller Fundo De Investimento Em Direitos Creditórios
Debt Instrument [Line Items]
Collateralized debt	36
Seller Fundo De Investimento Em Direitos Creditórios
Debt Instrument [Line Items]
Collateralized debt	18
Mercado Crédito Consumo XXVI
Debt Instrument [Line Items]
Collateralized debt	3
Mercado Crédito Consumo XXVII
Debt Instrument [Line Items]
Collateralized debt	9
Mercado Crédito Consumo XXVIII
Debt Instrument [Line Items]
Collateralized debt	11
Mercado Crédito Consumo XXIX
Debt Instrument [Line Items]
Collateralized debt	11
Mercado Crédito Consumo XXX
Debt Instrument [Line Items]
Collateralized debt	12
Mercado Crédito Consumo XXXI
Debt Instrument [Line Items]
Collateralized debt	16
Mercado Crédito Consumo XXXII
Debt Instrument [Line Items]
Collateralized debt	18
Mercado Crédito Consumo XXXIII
Debt Instrument [Line Items]
Collateralized debt	25
Mercado Credito Consumo XXXIV
Debt Instrument [Line Items]
Collateralized debt	18
Mercado Crédito XIX
Debt Instrument [Line Items]
Collateralized debt	1
Mercado Crédito Consumo XXXI
Debt Instrument [Line Items]
Collateralized debt	5
Mercado Crédito XXI
Debt Instrument [Line Items]
Collateralized debt	6
Mercado Crédito XXII
Debt Instrument [Line Items]
Collateralized debt	6
Mercado Credito XXI
Debt Instrument [Line Items]
Collateralized debt	14
Fideicomiso de administración y fuente de pago CIB/3756
Debt Instrument [Line Items]
Collateralized debt	229
Fideicomiso de administración y fuente de pago CIB/3369
Debt Instrument [Line Items]
Collateralized debt	33
Fideicomiso de administración y fuente de pago CIB/3369
Debt Instrument [Line Items]
Collateralized debt	$ 249
CDI \| Mercado Crédito I Brasil Fundo de Investimento Em Direitos Creditórios Não Padronizados
Debt Instrument [Line Items]
Basis spread on variable rate	2.50%
CDI \| Mercado Crédito Fundo de Investimento Em Direitos Creditórios Não Padronizado
Debt Instrument [Line Items]
Basis spread on variable rate	3.50%
CDI \| Olimpia Fundo de Investimento Em Direitos Creditórios
Debt Instrument [Line Items]
Basis spread on variable rate	1.25%
CDI \| Mercado Crédito II Brasil Fundo De Investimento Em Direitos Creditórios Nao Padronizados
Debt Instrument [Line Items]
Basis spread on variable rate	2.35%
CDI \| Seller Fundo De Investimento Em Direitos Creditórios
Debt Instrument [Line Items]
Basis spread on variable rate	1.60%
CDI \| Seller Fundo De Investimento Em Direitos Creditórios
Debt Instrument [Line Items]
Basis spread on variable rate	1.80%
CDI \| Seller Fundo De Investimento Em Direitos Creditórios
Debt Instrument [Line Items]
Basis spread on variable rate	1.40%
CDI \| Seller Fundo De Investimento Em Direitos Creditórios
Debt Instrument [Line Items]
Basis spread on variable rate	1.60%
BADLAR Rate \| Mercado Crédito Consumo XXVI
Debt Instrument [Line Items]
Basis spread on variable rate	2.00%
BADLAR Rate \| Mercado Crédito Consumo XXVII
Debt Instrument [Line Items]
Basis spread on variable rate	2.00%
BADLAR Rate \| Mercado Crédito Consumo XXVIII
Debt Instrument [Line Items]
Basis spread on variable rate	2.00%
BADLAR Rate \| Mercado Crédito Consumo XXIX
Debt Instrument [Line Items]
Basis spread on variable rate	2.00%
BADLAR Rate \| Mercado Crédito Consumo XXX
Debt Instrument [Line Items]
Basis spread on variable rate	2.00%
BADLAR Rate \| Mercado Crédito Consumo XXXI
Debt Instrument [Line Items]
Basis spread on variable rate	2.00%
BADLAR Rate \| Mercado Crédito Consumo XXXIII
Debt Instrument [Line Items]
Basis spread on variable rate	2.00%
BADLAR Rate \| Mercado Credito Consumo XXXIV
Debt Instrument [Line Items]
Basis spread on variable rate	2.00%
BADLAR Rate \| Mercado Crédito XIX
Debt Instrument [Line Items]
Basis spread on variable rate	2.00%
BADLAR Rate \| Mercado Crédito Consumo XXXI
Debt Instrument [Line Items]
Basis spread on variable rate	2.00%
BADLAR Rate \| Mercado Crédito XXI
Debt Instrument [Line Items]
Basis spread on variable rate	2.00%
BADLAR Rate \| Mercado Crédito XXII
Debt Instrument [Line Items]
Basis spread on variable rate	2.00%
BADLAR Rate \| Mercado Credito XXI
Debt Instrument [Line Items]
Basis spread on variable rate	2.00%
BADLAR Rate \| Minimum \| Mercado Crédito Consumo XXVI
Debt Instrument [Line Items]
Effective interest rate	100.00%
BADLAR Rate \| Minimum \| Mercado Crédito Consumo XXVII
Debt Instrument [Line Items]
Effective interest rate	100.00%
BADLAR Rate \| Minimum \| Mercado Crédito Consumo XXVIII
Debt Instrument [Line Items]
Effective interest rate	100.00%
BADLAR Rate \| Minimum \| Mercado Crédito Consumo XXIX
Debt Instrument [Line Items]
Effective interest rate	75.00%
BADLAR Rate \| Minimum \| Mercado Crédito Consumo XXX
Debt Instrument [Line Items]
Effective interest rate	75.00%
BADLAR Rate \| Minimum \| Mercado Crédito Consumo XXXI
Debt Instrument [Line Items]
Effective interest rate	45.00%
BADLAR Rate \| Minimum \| Mercado Crédito Consumo XXXII
Debt Instrument [Line Items]
Effective interest rate	25.00%
BADLAR Rate \| Minimum \| Mercado Crédito Consumo XXXIII
Debt Instrument [Line Items]
Effective interest rate	5.00%
BADLAR Rate \| Minimum \| Mercado Credito Consumo XXXIV
Debt Instrument [Line Items]
Effective interest rate	15.00%
BADLAR Rate \| Minimum \| Mercado Crédito XIX
Debt Instrument [Line Items]
Effective interest rate	100.00%
BADLAR Rate \| Minimum \| Mercado Crédito Consumo XXXI
Debt Instrument [Line Items]
Effective interest rate	100.00%
BADLAR Rate \| Minimum \| Mercado Crédito XXI
Debt Instrument [Line Items]
Effective interest rate	45.00%
BADLAR Rate \| Minimum \| Mercado Crédito XXII
Debt Instrument [Line Items]
Effective interest rate	15.00%
BADLAR Rate \| Minimum \| Mercado Credito XXI
Debt Instrument [Line Items]
Effective interest rate	15.00%
BADLAR Rate \| Maximum \| Mercado Crédito Consumo XXVI
Debt Instrument [Line Items]
Effective interest rate	160.00%
BADLAR Rate \| Maximum \| Mercado Crédito Consumo XXVII
Debt Instrument [Line Items]
Effective interest rate	180.00%
BADLAR Rate \| Maximum \| Mercado Crédito Consumo XXVIII
Debt Instrument [Line Items]
Effective interest rate	190.00%
BADLAR Rate \| Maximum \| Mercado Crédito Consumo XXIX
Debt Instrument [Line Items]
Effective interest rate	155.00%
BADLAR Rate \| Maximum \| Mercado Crédito Consumo XXX
Debt Instrument [Line Items]
Effective interest rate	155.00%
BADLAR Rate \| Maximum \| Mercado Crédito Consumo XXXI
Debt Instrument [Line Items]
Effective interest rate	125.00%
BADLAR Rate \| Maximum \| Mercado Crédito Consumo XXXII
Debt Instrument [Line Items]
Basis spread on variable rate	2.00%
Effective interest rate	80.00%
BADLAR Rate \| Maximum \| Mercado Crédito Consumo XXXIII
Debt Instrument [Line Items]
Effective interest rate	60.00%
BADLAR Rate \| Maximum \| Mercado Credito Consumo XXXIV
Debt Instrument [Line Items]
Effective interest rate	60.00%
BADLAR Rate \| Maximum \| Mercado Crédito XIX
Debt Instrument [Line Items]
Effective interest rate	140.00%
BADLAR Rate \| Maximum \| Mercado Crédito Consumo XXXI
Debt Instrument [Line Items]
Effective interest rate	170.00%
BADLAR Rate \| Maximum \| Mercado Crédito XXI
Debt Instrument [Line Items]
Effective interest rate	125.00%
BADLAR Rate \| Maximum \| Mercado Crédito XXII
Debt Instrument [Line Items]
Effective interest rate	70.00%
BADLAR Rate \| Maximum \| Mercado Credito XXI
Debt Instrument [Line Items]
Effective interest rate	60.00%
Diario Oficial \| Fideicomiso de administración y fuente de pago CIB/3756
Debt Instrument [Line Items]
Effective interest rate	2.35%
Diario Oficial \| Fideicomiso de administración y fuente de pago CIB/3369
Debt Instrument [Line Items]
Effective interest rate	7.00%
Diario Oficial \| Fideicomiso de administración y fuente de pago CIB/3369
Debt Instrument [Line Items]
Effective interest rate	2.80%