v3.25.2
Retirement benefits - Summary of Assumptions for Sensitivity Analysis (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Rate of increase in pensionable remuneration    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Percentage assumptions used 3.90% 3.90%
Expected age at death for persons aged 60:    
Range of assumptions, possible decrease 1.00%  
Range of assumptions, possible increase 1.00%  
Rate of increase in pensionable remuneration | of which the Netherlands [B]    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Percentage assumptions used 3.30% 3.30%
Rate of increase in pensionable remuneration | of which the UK    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Percentage assumptions used 3.50% 4.10%
Rate of increase in pensionable remuneration | of which the USA    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Percentage assumptions used 4.60% 4.60%
Rate of increase in pensionable remuneration | Bottom of range    
Expected age at death for persons aged 60:    
Increase/(decrease) in defined benefit obligations $ (421) $ (828)
Rate of increase in pensionable remuneration | Top of range    
Expected age at death for persons aged 60:    
Increase/(decrease) in defined benefit obligations $ 469 $ 915
Rate of increase in pensions in payment    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Percentage assumptions used 2.00% 1.90%
Expected age at death for persons aged 60:    
Range of assumptions, possible decrease 1.00%  
Range of assumptions, possible increase 1.00%  
Rate of increase in pensions in payment | of which the Netherlands [B]    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Percentage assumptions used 2.10% 2.40%
Rate of increase in pensions in payment | of which the UK    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Percentage assumptions used 2.90% 2.80%
Rate of increase in pensions in payment | of which the USA    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Percentage assumptions used 0.00% 0.00%
Rate of increase in pensions in payment | Bottom of range    
Expected age at death for persons aged 60:    
Increase/(decrease) in defined benefit obligations $ (4,978) $ (5,599)
Rate of increase in pensions in payment | Top of range    
Expected age at death for persons aged 60:    
Increase/(decrease) in defined benefit obligations $ 6,045 $ 6,713
Discount rate for pension plans    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Percentage assumptions used 4.50% 4.10%
Expected age at death for persons aged 60:    
Range of assumptions, possible decrease 1.00%  
Range of assumptions, possible increase 1.00%  
Discount rate for pension plans | of which the Netherlands [B]    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Percentage assumptions used 3.50% 3.30%
Discount rate for pension plans | of which the UK    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Percentage assumptions used 5.50% 4.60%
Discount rate for pension plans | of which the USA    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Percentage assumptions used 5.60% 4.90%
Discount rate for pension plans | Bottom of range    
Expected age at death for persons aged 60:    
Increase/(decrease) in defined benefit obligations $ 8,641 $ 10,560
Discount rate for pension plans | Top of range    
Expected age at death for persons aged 60:    
Increase/(decrease) in defined benefit obligations $ (6,925) $ (8,472)
Inflation rate for defined benefit obligation    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Weighted average inflation rate used in the calculation of the defined benefit obligation 2.10% 2.00%
Expected age at death for persons aged 60:    
Range of assumptions, possible decrease 1.00%  
Range of assumptions, possible increase 1.00%  
Inflation rate for defined benefit obligation | of which the Netherlands [B]    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Weighted average inflation rate used in the calculation of the defined benefit obligation 2.10% 2.40%
Inflation rate for defined benefit obligation | of which the UK    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Weighted average inflation rate used in the calculation of the defined benefit obligation 3.00% 2.90%
Inflation rate for defined benefit obligation | Bottom of range    
Expected age at death for persons aged 60:    
Increase/(decrease) in defined benefit obligations $ (5,328) $ (6,034)
Inflation rate for defined benefit obligation | Top of range    
Expected age at death for persons aged 60:    
Increase/(decrease) in defined benefit obligations $ 6,494 $ 7,300
Rate of increase in health-care costs    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Percentage assumptions used 8.00% 7.00%
Expected age at death for persons aged 60:    
Range of assumptions, possible decrease 1.00%  
Range of assumptions, possible increase 1.00%  
Rate of increase in health-care costs | Bottom of range    
Expected age at death for persons aged 60:    
Increase/(decrease) in defined benefit obligations $ (295) $ (338)
Rate of increase in health-care costs | Top of range    
Expected age at death for persons aged 60:    
Increase/(decrease) in defined benefit obligations $ 359 $ 422
Discount rate for health-care plans    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Percentage assumptions used 6.00% 5.60%
Expected age at death for persons aged 60:    
Range of assumptions, possible decrease 1.00%  
Range of assumptions, possible increase 1.00%  
Discount rate for health-care plans | Bottom of range    
Expected age at death for persons aged 60:    
Increase/(decrease) in defined benefit obligations $ 390 $ 457
Discount rate for health-care plans | Top of range    
Expected age at death for persons aged 60:    
Increase/(decrease) in defined benefit obligations $ (314) $ (358)
Men    
Expected age at death for persons aged 60:    
Expected age at death assumptions used 88 years 88 years
Range of assumptions, expected age at death decrease 1 year  
Range of assumptions, expected age at death increase 1 year  
Men | of which the Netherlands [B]    
Expected age at death for persons aged 60:    
Expected age at death assumptions used 88 years 88 years
Men | of which the UK    
Expected age at death for persons aged 60:    
Expected age at death assumptions used 87 years 87 years
Men | of which the USA    
Expected age at death for persons aged 60:    
Expected age at death assumptions used 88 years 87 years
Men | Bottom of range    
Expected age at death for persons aged 60:    
Increase/(decrease) in defined benefit obligations $ (970) $ (1,166)
Men | Top of range    
Expected age at death for persons aged 60:    
Increase/(decrease) in defined benefit obligations $ 981 $ 1,143
Women    
Expected age at death for persons aged 60:    
Expected age at death assumptions used 89 years 89 years
Range of assumptions, expected age at death decrease 1 year  
Range of assumptions, expected age at death increase 1 year  
Women | of which the Netherlands [B]    
Expected age at death for persons aged 60:    
Expected age at death assumptions used 90 years 90 years
Women | of which the UK    
Expected age at death for persons aged 60:    
Expected age at death assumptions used 89 years 89 years
Women | of which the USA    
Expected age at death for persons aged 60:    
Expected age at death assumptions used 89 years 89 years
Women | Bottom of range    
Expected age at death for persons aged 60:    
Increase/(decrease) in defined benefit obligations $ (850) $ (1,006)
Women | Top of range    
Expected age at death for persons aged 60:    
Increase/(decrease) in defined benefit obligations $ 874 $ 1,041