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Pensions - Funding and contributions by the Group and most significant assumptions used for the Main Scheme (Details) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Pensions      
Administrative expenses £ 4,082 £ 3,980 £ 5,304
Contributions by employer £ 780 296  
Fixed interest swap and guilt yields plus percentage 0.64%    
Life expectancy of male employees after retirement who are currently at age 60 27 years 8 months 12 days    
Life expectancy of female employees after retirement who are currently at age 60 29 years 4 months 24 days    
Life expectancy of male employees after retirement who are currently aged 40 28 years 10 months 24 days    
Life expectancy of female employees after retirement who are currently aged 40 30 years 8 months 12 days    
Amount of impact of guaranteed minimum pension equalisation £ 0 £ 169  
Main Scheme      
Pensions      
Period of funding valuations (in years) 3 years    
Funding level, as percent   104.00%  
Pension liabilities   £ 49,000  
Deficit   2,000  
Cash payment £ 1,500    
Contributions by employer 705 233  
Contributions by employer, capped amount £ 500 £ 0  
Average cost (as a percent)   49.00%  
Main Scheme | Principal IAS 19 actuarial assumptions      
Pensions      
Discount rate 1.80% 1.40%  
Inflation assumption (RPI) 3.30% 2.90%  
Rate of increase in salaries 1.80% 1.80%  
Rate of increase in deferred pensions 3.70% 3.00%  
Rate of increase in pensions in payment 2.50% 2.70%  
Proportion of pension converted to a cash lump sum at retirement 18.00% 20.00%  
Longevity at age 60 for current pensioners (years), males 27 years 3 months 18 days 27 years 1 month 6 days  
Longevity at age 60 for current pensioners (years), females 29 years 29 years  
Longevity at age 60 for future pensioners currently aged 40 (years), males 28 years 2 months 12 days 28 years 3 months 18 days  
Longevity at age 60 for future pensioners currently aged 40 (years), females 30 years 1 month 6 days 30 years 4 months 24 days  
Main Scheme | Maximum | Distributions to shareholders of an equal amount are made [Member]      
Pensions      
Settlement of the future contributions £ 500