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Note 8 Financial assets level 3 Sensitivity analysis (Details) - EUR (€)
€ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Financial assets Level 3 sensitivity analysis [Line Items]      
Financial assets at fair value through other comprehensive income € (60,421) € (69,440) € (61,183)
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    
Non trading financial assets mandatorily at fair value through profit or loss 35    
Financial assets designated at fair value through profit or loss 0    
Financial assets at fair value through other comprehensive income 0    
Financial assets level 3 total 68    
Financial liabilities held for trading 3    
Financial liabilities level 3 total 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 4    
Non trading financial assets mandatorily at fair value through profit or loss 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 24    
Non trading financial assets mandatorily at fair value through profit or loss 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 1    
Non trading financial assets mandatorily at fair value through profit or loss 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 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 (57)    
Non trading financial assets mandatorily at fair value through profit or loss (36)    
Financial assets designated at fair value through profit or loss 0    
Financial assets at fair value through other comprehensive income 0    
Financial assets level 3 total (93)    
Financial liabilities held for trading (3)    
Financial liabilities level 3 total (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 (4)    
Non trading financial assets mandatorily at fair value through profit or loss (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 (24)    
Non trading financial assets mandatorily at fair value through profit or loss (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)    
Non trading financial assets mandatorily at fair value through profit or loss (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 (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    
Non trading financial assets mandatorily at fair value through profit or loss 0    
Financial assets designated at fair value through profit or loss 0    
Financial assets at fair value through other comprehensive income (41)    
Financial assets level 3 total 41    
Financial liabilities held for trading 0    
Financial liabilities level 3 total 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    
Non trading financial assets mandatorily at fair value through profit or loss 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    
Non trading financial assets mandatorily at fair value through profit or loss 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    
Non trading financial assets mandatorily at fair value through profit or loss 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    
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    
Non trading financial assets mandatorily at fair value through profit or loss 0    
Financial assets designated at fair value through profit or loss 0    
Financial assets at fair value through other comprehensive income (43)    
Financial assets level 3 total (43)    
Financial liabilities held for trading 0    
Financial liabilities level 3 total 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    
Non trading financial assets mandatorily at fair value through profit or loss 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    
Non trading financial assets mandatorily at fair value through profit or loss 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    
Non trading financial assets mandatorily at fair value through profit or loss 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