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Note 7 VaR by Risk factor (Details) - EUR (€)
€ in Millions

Dec. 31, 2021

Dec. 31, 2020

Dec. 31, 2019

VaR average in the year [Member]

VaR by risk factor [Line Items]

VaR by risk factor

€ 29

€ 27

€ 19

VaR max in the year [Member]

VaR by risk factor [Line Items]

VaR by risk factor

36

39

25

VaR min in the year [Member]

VaR by risk factor [Line Items]

VaR by risk factor

22

18

14

End of period VaR [Member]

VaR by risk factor [Line Items]

VaR by risk factor

31

28

20

Interest spread risk [Member] | VaR average in the year [Member]

VaR by risk factor [Line Items]

VaR by risk factor

33

29

21

Interest spread risk [Member] | VaR max in the year [Member]

VaR by risk factor [Line Items]

VaR by risk factor

32

39

28

Interest spread risk [Member] | VaR min in the year [Member]

VaR by risk factor [Line Items]

VaR by risk factor

27

20

13

Interest spread risk [Member] | End of period VaR [Member]

VaR by risk factor [Line Items]

VaR by risk factor

34

32

24

Currency risk [member] | VaR average in the year [Member]

VaR by risk factor [Line Items]

VaR by risk factor

10

12

6

Currency risk [member] | VaR max in the year [Member]

VaR by risk factor [Line Items]

VaR by risk factor

13

20

6

Currency risk [member] | VaR min in the year [Member]

VaR by risk factor [Line Items]

VaR by risk factor

9

3

5

Currency risk [member] | End of period VaR [Member]

VaR by risk factor [Line Items]

VaR by risk factor

9

12

5

Stock market risk [Member] | VaR average in the year [Member]

VaR by risk factor [Line Items]

VaR by risk factor

2

4

4

Stock market risk [Member] | VaR max in the year [Member]

VaR by risk factor [Line Items]

VaR by risk factor

4

10

3

Stock market risk [Member] | VaR min in the year [Member]

VaR by risk factor [Line Items]

VaR by risk factor

1

1

5

Stock market risk [Member] | End of period VaR [Member]

VaR by risk factor [Line Items]

VaR by risk factor

5

2

5

Vega Correlation risk [Member] | VaR average in the year [Member]

VaR by risk factor [Line Items]

VaR by risk factor

11

11

9

Vega Correlation risk [Member] | VaR max in the year [Member]

VaR by risk factor [Line Items]

VaR by risk factor

1

20

9

Vega Correlation risk [Member] | VaR min in the year [Member]

VaR by risk factor [Line Items]

VaR by risk factor

10

6

9

Vega Correlation risk [Member] | End of period VaR [Member]

VaR by risk factor [Line Items]

VaR by risk factor

11

11

8

Diversification effect [Member] | VaR average in the year [Member]

VaR by risk factor [Line Items]

VaR by risk factor

^[1]

(28)

(28)

(20)

Diversification effect [Member] | VaR max in the year [Member]

VaR by risk factor [Line Items]

VaR by risk factor

^[1]

(14)

(14)

(21)

Diversification effect [Member] | VaR min in the year [Member]

VaR by risk factor [Line Items]

VaR by risk factor

^[1]

(25)

(39)

(18)

Diversification effect [Member] | End of period VaR [Member]

VaR by risk factor [Line Items]

VaR by risk factor

^[1]

€ (29)

€ (29)

€ (22)

[1]	(*) The diversification effect is the difference between the sum of the average individual risk factors and the total VaR figure that includes the implied correlation between all the variables and scenarios used in the measurement.