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Note 8 Financial instruments level 3 sensitivity analysis (Details) - EUR (€)
€ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Financial assets Level 3 sensitivity analysis [Line Items]      
Financial assets at fair value through other comprehensive income € (58,980) € (60,421) € (69,440)
Potential impact on consolidated income statement [Member] | Most favorable hypothesis [Member]      
Financial assets Level 3 sensitivity analysis [Line Items]      
Financial assets held for trading 33 33  
Non trading financial assets mandatorily at fair value through profit or loss 135 35  
Financial assets designated at fair value through profit or loss 0 0  
Financial assets at fair value through other comprehensive income 0 0  
Financial assets level 3 total 168 68  
Financial liabilities held for trading 7 3  
Financial liabilities level 3 total 7 3  
Potential impact on consolidated income statement [Member] | Most favorable hypothesis [Member] | Loans and receivables, category [member]      
Financial assets Level 3 sensitivity analysis [Line Items]      
Financial assets held for trading 1 4  
Non trading financial assets mandatorily at fair value through profit or loss 0 16  
Potential impact on consolidated income statement [Member] | Most favorable hypothesis [Member] | Debt securities [Member]      
Financial assets Level 3 sensitivity analysis [Line Items]      
Financial assets held for trading 0 24  
Non trading financial assets mandatorily at fair value through profit or loss 17 10  
Potential impact on consolidated income statement [Member] | Most favorable hypothesis [Member] | equity instruments [Member]      
Financial assets Level 3 sensitivity analysis [Line Items]      
Financial assets held for trading 25 1  
Non trading financial assets mandatorily at fair value through profit or loss 118 9  
Potential impact on consolidated income statement [Member] | Most favorable hypothesis [Member] | Derivatives [member]      
Financial assets Level 3 sensitivity analysis [Line Items]      
Financial assets held for trading 6 5  
Potential impact on consolidated income statement [Member] | Least favorable hypothesis [Member]      
Financial assets Level 3 sensitivity analysis [Line Items]      
Financial assets held for trading (33) (57)  
Non trading financial assets mandatorily at fair value through profit or loss (136) (36)  
Financial assets designated at fair value through profit or loss 0 0  
Financial assets at fair value through other comprehensive income 0 0  
Financial assets level 3 total (169) (93)  
Financial liabilities held for trading (7) (3)  
Financial liabilities level 3 total (7) (3)  
Potential impact on consolidated income statement [Member] | Least favorable hypothesis [Member] | Loans and receivables, category [member]      
Financial assets Level 3 sensitivity analysis [Line Items]      
Financial assets held for trading (1) (4)  
Non trading financial assets mandatorily at fair value through profit or loss 0 (5)  
Potential impact on consolidated income statement [Member] | Least favorable hypothesis [Member] | Debt securities [Member]      
Financial assets Level 3 sensitivity analysis [Line Items]      
Financial assets held for trading 0 (24)  
Non trading financial assets mandatorily at fair value through profit or loss (19) (10)  
Potential impact on consolidated income statement [Member] | Least favorable hypothesis [Member] | equity instruments [Member]      
Financial assets Level 3 sensitivity analysis [Line Items]      
Financial assets held for trading (25) (25)  
Non trading financial assets mandatorily at fair value through profit or loss (118) (21)  
Potential impact on consolidated income statement [Member] | Least favorable hypothesis [Member] | Derivatives [member]      
Financial assets Level 3 sensitivity analysis [Line Items]      
Financial assets held for trading (6) (5)  
Potential impact on other comprehensive income [Member] | Most favorable hypothesis [Member]      
Financial assets Level 3 sensitivity analysis [Line Items]      
Financial assets held for trading 0 0  
Non trading financial assets mandatorily at fair value through profit or loss 0 0  
Financial assets designated at fair value through profit or loss 0 0  
Financial assets at fair value through other comprehensive income (25) (41)  
Financial assets level 3 total 25 41  
Financial liabilities held for trading 0 0  
Financial liabilities level 3 total 0 0  
Potential impact on other comprehensive income [Member] | Most favorable hypothesis [Member] | Loans and receivables, category [member]      
Financial assets Level 3 sensitivity analysis [Line Items]      
Financial assets held for trading 0 0  
Non trading financial assets mandatorily at fair value through profit or loss 0 0  
Potential impact on other comprehensive income [Member] | Most favorable hypothesis [Member] | Debt securities [Member]      
Financial assets Level 3 sensitivity analysis [Line Items]      
Financial assets held for trading 0 0  
Non trading financial assets mandatorily at fair value through profit or loss 0 0  
Potential impact on other comprehensive income [Member] | Most favorable hypothesis [Member] | equity instruments [Member]      
Financial assets Level 3 sensitivity analysis [Line Items]      
Financial assets held for trading 0 0  
Non trading financial assets mandatorily at fair value through profit or loss 0 0  
Potential impact on other comprehensive income [Member] | Most favorable hypothesis [Member] | Derivatives [member]      
Financial assets Level 3 sensitivity analysis [Line Items]      
Financial assets held for trading 0 0  
Potential impact on other comprehensive income [Member] | Least favorable hypothesis [Member]      
Financial assets Level 3 sensitivity analysis [Line Items]      
Financial assets held for trading 0 0  
Non trading financial assets mandatorily at fair value through profit or loss 0 0  
Financial assets designated at fair value through profit or loss 0 0  
Financial assets at fair value through other comprehensive income (25) (43)  
Financial assets level 3 total (25) (43)  
Financial liabilities held for trading 0 0  
Financial liabilities level 3 total 0 0  
Potential impact on other comprehensive income [Member] | Least favorable hypothesis [Member] | Loans and receivables, category [member]      
Financial assets Level 3 sensitivity analysis [Line Items]      
Financial assets held for trading 0 0  
Non trading financial assets mandatorily at fair value through profit or loss 0 0  
Potential impact on other comprehensive income [Member] | Least favorable hypothesis [Member] | Debt securities [Member]      
Financial assets Level 3 sensitivity analysis [Line Items]      
Financial assets held for trading 0 0  
Non trading financial assets mandatorily at fair value through profit or loss 0 0  
Potential impact on other comprehensive income [Member] | Least favorable hypothesis [Member] | equity instruments [Member]      
Financial assets Level 3 sensitivity analysis [Line Items]      
Financial assets held for trading 0 0  
Non trading financial assets mandatorily at fair value through profit or loss 0 0  
Potential impact on other comprehensive income [Member] | Least favorable hypothesis [Member] | Derivatives [member]      
Financial assets Level 3 sensitivity analysis [Line Items]      
Financial assets held for trading € 0 € 0