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Pensions - Funding and contributions by the Group and most significant assumptions used for the Main Scheme (Details) - GBP (£)
£ in Billions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Pensions    
Fixed interest swap and guilt yields plus percentage 0.0064%  
Life expectancy of male employees after retirement who are currently at age 60 27 years 1 month 6 days  
Life expectancy of female employees after retirement who are currently at age 60 29 years 1 month 6 days  
Life expectancy of male employees after retirement who are currently aged 40 28 years 6 months  
Life expectancy of female employees after retirement who are currently aged 40 30 years 7 months 6 days  
Main Pension Scheme    
Pensions    
Period of funding valuations (in years) 3 years  
Discount rate 5.60% 4.80%
Inflation assumption (RPI) 3.20% 3.10%
Rate of increase in salaries 1.80% 1.80%
Rate of increase in deferred pensions 3.40% 3.20%
Rate of increase in pensions in payment 2.60% 2.40%
Proportion of pension converted to a cash lump sum at retirement 18.00% 18.00%
Longevity at age 60 for current pensioners (years), males 26 years 6 months 26 years 9 months 18 days
Longevity at age 60 for current pensioners (years), females 28 years 6 months 28 years 7 months 6 days
Longevity at age 60 for future pensioners currently aged 40 (years), males 27 years 6 months 27 years 8 months 12 days
Longevity at age 60 for future pensioners currently aged 40 (years), females 29 years 8 months 12 days 29 years 6 months
Main pension scheme, 2023 triennial valuation    
Pensions    
Funding level, as percent 115.00%  
Pension liabilities £ 29  
Surplus as per actuarial assumptions £ 4  
Average cost (as a percent) 21.20%