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Discontinued operations and assets and liabilities of disposal groups (Details)
€ in Billions
 12 Months Ended
Dec. 17, 2021
item
Jun. 28, 2021
EUR (€)
Dec. 31, 2021
item
Disclosure of analysis of single amount of discontinued operations [line items]      
Number of legally binding agreements for sale of business | item     2
Allied Irish Banks, p.l.c      
Disclosure of analysis of single amount of discontinued operations [line items]      
Binding sale agreement transfer amount | €   € 4.2  
Binding sale agreement, additional amount of undrawn exposures | €   € 2.8  
Permanent TSB Group Holdings p.l.c.      
Disclosure of analysis of single amount of discontinued operations [line items]      
Approximate number of employees will have the right to transfer | item 450