v3.25.2
Retirement benefits - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Jan. 30, 2024
Dec. 31, 2022
Dec. 31, 2021
Disclosure of defined benefit plans [line items]          
Net defined benefit liability (asset)   $ (1,602)   $ (2,904)  
Defined benefit plan obligation          
Disclosure of defined benefit plans [line items]          
Net defined benefit liability (asset)   78,024   73,481 $ 107,336
Defined benefit plan assets          
Disclosure of defined benefit plans [line items]          
Net defined benefit liability (asset)   (79,961)   (76,756) (104,495)
The Netherlands          
Disclosure of defined benefit plans [line items]          
Surplus (deficit)   $ 3,520   $ 3,378  
Percentage of defined benefit liability related to active members   23.00%   23.00%  
The Netherlands | Defined benefit plan obligation          
Disclosure of defined benefit plans [line items]          
Net defined benefit liability (asset)   $ 26,746   $ 24,608 35,340
The Netherlands | Defined benefit plan assets          
Disclosure of defined benefit plans [line items]          
Net defined benefit liability (asset)   $ (30,266)   $ (27,986) (37,096)
UK          
Disclosure of defined benefit plans [line items]          
Percentage of defined benefit liability related to active members   16.00%   17.00%  
Actuarial funding valuation, frequency   3 years      
Actuarial funding valuation, funding ratio   103.00%      
UK | Defined benefit plan obligation          
Disclosure of defined benefit plans [line items]          
Net defined benefit liability (asset)   $ 19,074   $ 17,791 29,913
UK | Defined benefit plan assets          
Disclosure of defined benefit plans [line items]          
Net defined benefit liability (asset)   (22,320)   (21,963) (33,720)
UK | Funded pension plans          
Disclosure of defined benefit plans [line items]          
Surplus (deficit)   3,246   4,172  
UK | Unfunded pension plans          
Disclosure of defined benefit plans [line items]          
Surplus (deficit)   340   317  
USA          
Disclosure of defined benefit plans [line items]          
Surplus (deficit)   $ 140   $ 318  
Percentage of defined benefit liability related to active members   23.00%   24.00%  
USA | Settlement of pension liabilities          
Disclosure of defined benefit plans [line items]          
Gain on settlement of defined benefit liabilities $ 101        
USA | Defined benefit plan obligation          
Disclosure of defined benefit plans [line items]          
Net defined benefit liability (asset)   $ 15,579   $ 14,793 19,003
USA | Defined benefit plan obligation | Settlement of pension liabilities          
Disclosure of defined benefit plans [line items]          
Net defined benefit liability (asset)     $ 5,052    
USA | Defined benefit plan assets          
Disclosure of defined benefit plans [line items]          
Net defined benefit liability (asset)   (14,835)   (14,243) (18,055)
USA | Defined benefit plan assets | Settlement of pension liabilities          
Disclosure of defined benefit plans [line items]          
Net defined benefit liability (asset)     $ 4,920    
USA | Unfunded pension plans          
Disclosure of defined benefit plans [line items]          
Surplus (deficit)   (884)   (868)  
Pensions          
Disclosure of defined benefit plans [line items]          
Estimate of contributions expected to be paid to plan for next annual reporting period   480      
Pensions | Funded pension plans | Defined benefit plan obligation          
Disclosure of defined benefit plans [line items]          
Net defined benefit liability (asset)   71,473   67,265  
Pensions | Unfunded pension plans | Defined benefit plan obligation          
Disclosure of defined benefit plans [line items]          
Net defined benefit liability (asset)   $ 3,450   3,337  
Pensions | The Netherlands | Top of range          
Disclosure of defined benefit plans [line items]          
Percentage of average local funding requirement for additional payments   105.00%      
Pensions | The Netherlands | Funded pension plans | Defined benefit plan obligation          
Disclosure of defined benefit plans [line items]          
Net defined benefit liability (asset)   $ 26,746   24,608  
Pensions | UK | Funded pension plans | Defined benefit plan obligation          
Disclosure of defined benefit plans [line items]          
Net defined benefit liability (asset)   18,734   17,474  
Pensions | UK | Unfunded pension plans | Defined benefit plan obligation          
Disclosure of defined benefit plans [line items]          
Net defined benefit liability (asset)   340   317  
Pensions | USA | Funded pension plans | Defined benefit plan obligation          
Disclosure of defined benefit plans [line items]          
Net defined benefit liability (asset)   14,695   13,925  
Pensions | USA | Unfunded pension plans | Defined benefit plan obligation          
Disclosure of defined benefit plans [line items]          
Net defined benefit liability (asset)   884   868  
OPEB | Defined benefit plan obligation          
Disclosure of defined benefit plans [line items]          
Net defined benefit liability (asset)   3,101   2,879 $ 4,867
OPEB | Unfunded pension plans | Defined benefit plan obligation          
Disclosure of defined benefit plans [line items]          
Net defined benefit liability (asset)   3,101   2,879  
OPEB | USA          
Disclosure of defined benefit plans [line items]          
Surplus (deficit)   $ (2,267)   $ (2,135)