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Hedge accounting (Details 1) - BRL (R$) | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
IfrsStatementLineItems [Line Items] |  |  |
Nominal Value | R$ 273,280,000,000 | R$ 148,125,000,000 |
Hedging instrument, assets | 4,556,000,000 | 7,061,000,000 |
Hedging instrument, liabilities | 1,965,000,000 | 3,748,000,000 |
Gain (loss) on hedge ineffectiveness recognised in other comprehensive income | (34,000,000) | 699,000,000 | R$ (3,557,000,000)
Gain (loss) on hedge ineffectiveness recognised in profit or loss | (160,000,000) | (19,000,000) |
Currency risk [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Nominal Value | 9,933,000,000 | 15,924,000,000 |
Gain (loss) on hedge ineffectiveness recognised in other comprehensive income | (14,836,000,000) | (14,701,000,000) |
Cash flow hedges [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Nominal Value | 225,396,000,000 | 111,412,000,000 |
Hedging instrument, assets | 424,000,000 | 447,000,000 |
Hedging instrument, liabilities | 685,000,000 | 617,000,000 |
Gain (loss) on change in fair value of hedging instrument used as basis for recognising hedge ineffectiveness | (554,000,000) | (946,000,000) |
Gain (loss) on hedge ineffectiveness recognised in other comprehensive income | (607,000,000) | (942,000,000) |
Gain (loss) on hedge ineffectiveness recognised in profit or loss | 53,000,000 | (4,000,000) |
Reclassification adjustments on cash flow hedges, net of tax | 379,000,000 | (13,000,000) |
Interest rate futures [member] | Cash flow hedges [member] | Interest rate risk [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Nominal Value | 206,586,000,000 | 87,311,000,000 |
Hedging instrument, assets | 31,000,000 | 58,000,000 |
Hedging instrument, liabilities | 27,000,000 | 24,000,000 |
Gain (loss) on change in fair value of hedging instrument used as basis for recognising hedge ineffectiveness | (653,000,000) | (1,035,000,000) |
Gain (loss) on hedge ineffectiveness recognised in other comprehensive income | (706,000,000) | (1,030,000,000) |
Gain (loss) on hedge ineffectiveness recognised in profit or loss | 53,000,000 | (5,000,000) |
Reclassification adjustments on cash flow hedges, net of tax |  | (13,000,000) |
Interest Rate Forward [Member] | Cash flow hedges [member] | Interest rate risk [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Nominal Value | 10,037,000,000 | 16,830,000,000 |
Hedging instrument, assets | 136,000,000 | 118,000,000 |
Hedging instrument, liabilities | 646,000,000 | 593,000,000 |
Gain (loss) on change in fair value of hedging instrument used as basis for recognising hedge ineffectiveness | 11,000,000 | (118,000,000) |
Gain (loss) on hedge ineffectiveness recognised in other comprehensive income | 11,000,000 | (118,000,000) |
Reclassification adjustments on cash flow hedges, net of tax | 1,000,000 |  |
Interest rate swap2 [Member] | Cash flow hedges [member] | Interest rate risk [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Nominal Value | 8,071,000,000 | 3,763,000,000 |
Hedging instrument, assets | 201,000,000 | 19,000,000 |
Hedging instrument, liabilities | 11,000,000 |  |
Gain (loss) on change in fair value of hedging instrument used as basis for recognising hedge ineffectiveness | 85,000,000 | 22,000,000 |
Gain (loss) on hedge ineffectiveness recognised in other comprehensive income | 85,000,000 | 21,000,000 |
Futures contract [member] | Cash flow hedges [member] | Interest rate risk [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Gain (loss) on change in fair value of hedging instrument used as basis for recognising hedge ineffectiveness |  | 185,000,000 |
Gain (loss) on hedge ineffectiveness recognised in other comprehensive income |  | 185,000,000 |
Reclassification adjustments on cash flow hedges, net of tax | 378,000,000 |  |
Futures contract [member] | Cash flow hedges [member] | Currency risk [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Nominal Value | 249,000,000 | 3,480,000,000 |
Hedging instrument, assets | 2,000,000 | 252,000,000 |
Forward contract [member] | Cash flow hedges [member] | Interest rate risk [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Gain (loss) on change in fair value of hedging instrument used as basis for recognising hedge ineffectiveness | 4,000,000 |  |
Gain (loss) on hedge ineffectiveness recognised in other comprehensive income | 4,000,000 |  |
Forward contract [member] | Cash flow hedges [member] | Currency risk [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Nominal Value | 94,000,000 | R$ 28,000,000 |
Hedging instrument, liabilities | 1,000,000 |  |
Swaps [Member] | Cash flow hedges [member] | Interest rate risk [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Gain (loss) on change in fair value of hedging instrument used as basis for recognising hedge ineffectiveness | (1,000,000) |  |
Gain (loss) on hedge ineffectiveness recognised in other comprehensive income | (1,000,000) |  |
Swaps [Member] | Cash flow hedges [member] | Currency risk [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Nominal Value | 359,000,000 |  |
Hedging instrument, assets | R$ 54,000,000 |  |

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