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Contingent assets and liabilities - Text Details (Detail) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Contingent assets and liabilities [Line Items]    
Fair value of guarantees recognized on the balance sheet  
Increase (decrease) of off-balance-sheet business and credit-related guarantees provided on behalf of third parties and associates € (14)  
Off-balance-sheet business and credit-related guarantees provided on behalf of third parties and associates € 2 € 16