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Accounting policies (Details)
 12 Months Ended
Dec. 31, 2021
item
Credit cards  
Financial assets carried at amortised cost  
Write off period 4 years
Accounting developments  
Number of arrear cycles after which the financial asset is written off 12
Financial Asset Writeoff Period 4 years
Minimum | Computer software  
Intangible assets and goodwill  
Estimated useful economic lives 3 years
Minimum | Other acquired intangibles  
Intangible assets and goodwill  
Estimated useful economic lives 5 years
Maximum | Retail mortgages  
Financial assets carried at amortised cost  
Write off period 5 years
Accounting developments  
Financial Asset Writeoff Period 5 years
Maximum | Overdrafts and other unsecured loans  
Financial assets carried at amortised cost  
Write off period 6 years
Accounting developments  
Financial Asset Writeoff Period 6 years
Maximum | Business loans  
Financial assets carried at amortised cost  
Write off period 5 years
Accounting developments  
Financial Asset Writeoff Period 5 years
Maximum | Computer software  
Intangible assets and goodwill  
Estimated useful economic lives 12 years
Maximum | Other acquired intangibles  
Intangible assets and goodwill  
Estimated useful economic lives 10 years