Risk management - Disclosure of concentrations by risk factor, trading risk (Details) - EUR (€)
€ in Millions

12 Months Ended

Dec. 31, 2025

Dec. 31, 2024

Dec. 31, 2023

Disclosure of nature and extent of risks arising from financial instruments [line items]

Time horizon

1 day

Market risk

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR confidence level, percent

99.00%

ES confidence level, percent

97.50%

VaR

€ 18.7

€ 13.5

Expected shortfall

16.9

Market risk | Total Europe

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

13.2

16.0

11.8

Expected shortfall

13.2

Market risk | Total North America

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

5.5

6.4

5.0

Expected shortfall

5.3

Market risk | Total South America

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

5.8

9.5

7.0

Expected shortfall

5.9

Market risk | Min

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

9.6

Market risk | Min | Total Europe

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

9.6

Market risk | Min | Total North America

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

3.7

Market risk | Min | Total South America

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

3.2

Market risk | Average

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

17.6

17.1

11.7

Market risk | Average | Total Europe

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

15.0

12.7

9.4

Market risk | Average | Total North America

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

5.8

6.9

4.0

Market risk | Average | Total South America

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

7.6

9.0

7.3

Market risk | Max

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

29.2

Market risk | Max | Total Europe

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

28.2

Market risk | Max | Total North America

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

8.9

Market risk | Max | Total South America

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

16.5

Diversification effect

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

(17.7)

(27.3)

(17.1)

Expected shortfall

(18.9)

Diversification effect | Total Europe

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

(15.9)

(18.4)

(13.8)

Expected shortfall

(17.8)

Diversification effect | Total North America

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

(1.6)

(0.8)

(0.5)

Expected shortfall

(1.8)

Diversification effect | Total South America

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

(8.7)

(5.5)

(6.6)

Expected shortfall

(6.2)

Diversification effect | Min

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

(10.7)

Diversification effect | Min | Total Europe

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

(8.9)

Diversification effect | Min | Total North America

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

(0.4)

Diversification effect | Min | Total South America

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

(0.3)

Diversification effect | Average

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

(21.0)

(19.8)

(14.9)

Diversification effect | Average | Total Europe

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

(18.0)

(15.4)

(10.5)

Diversification effect | Average | Total North America

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

(1.7)

(1.1)

(0.7)

Diversification effect | Average | Total South America

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

(5.2)

(6.9)

(6.2)

Diversification effect | Max

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

(59.3)

Diversification effect | Max | Total Europe

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

(32.4)

Diversification effect | Max | Total North America

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

(6.3)

Diversification effect | Max | Total South America

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

(28.7)

Interest rate

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

15.3

20.2

11.1

Expected shortfall

16.4

Interest rate | Total Europe

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

11.4

14.4

8.2

Expected shortfall

13.3

Interest rate | Total North America

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

4.8

6.6

5.0

Expected shortfall

4.9

Interest rate | Total South America

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

4.0

6.5

5.6

Expected shortfall

3.8

Interest rate | Min

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

11.2

Interest rate | Min | Total Europe

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

9.0

Interest rate | Min | Total North America

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

3.8

Interest rate | Min | Total South America

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

2.8

Interest rate | Average

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

16.5

17.0

12.2

Interest rate | Average | Total Europe

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

13.3

12.0

9.1

Interest rate | Average | Total North America

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

5.9

6.9

3.7

Interest rate | Average | Total South America

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

7.2

8.8

7.3

Interest rate | Max

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

23.0

Interest rate | Max | Total Europe

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

19.2

Interest rate | Max | Total North America

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

8.8

Interest rate | Max | Total South America

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

18.1

Equities

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

8.1

9.5

6.0

Expected shortfall

7.5

Equities | Total Europe

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

7.4

8.8

5.8

Expected shortfall

7.1

Equities | Total North America

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

1.0

0.1

0.0

Expected shortfall

1.0

Equities | Total South America

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

2.2

2.1

2.4

Expected shortfall

2.3

Equities | Min

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

2.4

Equities | Min | Total Europe

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

2.7

Equities | Min | Total North America

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

0.1

Equities | Min | Total South America

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

0.2

Equities | Average

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

6.5

6.0

3.2

Equities | Average | Total Europe

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

6.4

5.9

2.8

Equities | Average | Total North America

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

0.8

0.2

Equities | Average | Total South America

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

1.5

1.2

1.4

Equities | Max

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

10.8

Equities | Max | Total Europe

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

11.0

Equities | Max | Total North America

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

3.2

Equities | Max | Total South America

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

7.2

Exchange rate

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

6.3

5.9

4.8

Expected shortfall

5.8

Exchange rate | Total Europe

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

5.3

5.8

5.2

Expected shortfall

5.7

Exchange rate | Total North America

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

1.3

0.5

Expected shortfall

1.2

Exchange rate | Total South America

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

6.5

1.3

3.0

Expected shortfall

4.7

Exchange rate | Min

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

3.3

Exchange rate | Min | Total Europe

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

3.7

Exchange rate | Min | Total North America

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

0.2

Exchange rate | Min | Total South America

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

0.4

Exchange rate | Average

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

7.4

5.8

5.3

Exchange rate | Average | Total Europe

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

7.3

5.1

3.5

Exchange rate | Average | Total North America

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

0.8

0.9

0.8

Exchange rate | Average | Total South America

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

1.6

2.7

3.2

Exchange rate | Max

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

37.5

Exchange rate | Max | Total Europe

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

19.7

Exchange rate | Max | Total North America

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

3.2

Exchange rate | Max | Total South America

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

12.9

Credit spread

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

4.8

5.3

6.1

Expected shortfall

4.8

Credit spread | Total Europe

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

4.9

5.3

6.1

Expected shortfall

4.8

Credit spread | Min

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

3.2

Credit spread | Min | Total Europe

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

3.0

Credit spread | Average

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

5.7

4.9

4.3

Credit spread | Average | Total Europe

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

5.8

4.9

4.3

Credit spread | Max

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

10.2

Credit spread | Max | Total Europe

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

10.4

Commodities

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

1.9

5.1

2.6

Expected shortfall

1.3

Commodities | Total Europe

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

0.1

0.3

Expected shortfall

0.1

Commodities | Total South America

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

1.8

5.1

2.6

Expected shortfall

1.3

Commodities | Min

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

0.2

Commodities | Min | Total Europe

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

0.1

Commodities | Min | Total South America

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

0.1

Commodities | Average

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

2.5

3.2

1.6

Commodities | Average | Total Europe

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

0.2

Commodities | Average | Total South America

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

2.5

€ 3.2

€ 1.6

Commodities | Max

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

7.0

Commodities | Max | Total Europe

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

0.3

Commodities | Max | Total South America

Disclosure of nature and extent of risks arising from financial instruments [line items]

VaR

€ 7.0