v3.25.2
Retirement benefits - Summary of Defined Benefit Plan Obligations (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of net defined benefit liability (asset) [line items]      
Beginning balance $ (1,602)    
Actuarial (gains) losses (4,266) $ 2,375 $ (27,943)
Other movements (93) 44 (349)
Ending balance (3,251) (1,602)  
Defined benefit plan obligation      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning balance 78,024 73,481  
Current service cost 826 759  
Interest expense 2,911 3,238  
Actuarial (gains) losses (4,266) 2,375  
Benefit payments (3,770) (3,847)  
Other movements (4,837) 189  
Currency translation differences (2,834) 1,829  
Ending balance 66,054 78,024 73,481
Defined benefit plan obligation | The Netherlands      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning balance 26,746 24,608  
Current service cost 186 184  
Interest expense 847 904  
Actuarial (gains) losses (1,377) 929  
Benefit payments (1,076) (1,032)  
Other movements (251) 252  
Currency translation differences (1,498) 901  
Ending balance 23,577 26,746 24,608
Defined benefit plan obligation | UK      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning balance 19,074 17,791  
Current service cost 148 145  
Interest expense 847 881  
Actuarial (gains) losses (1,793) 257  
Benefit payments (1,081) (1,014)  
Other movements (1) 0  
Currency translation differences (237) 1,014  
Ending balance 16,957 19,074 17,791
Defined benefit plan obligation | USA      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning balance 15,579 14,793  
Current service cost 239 215  
Interest expense 507 695  
Actuarial (gains) losses (997) 832  
Benefit payments (702) (956)  
Other movements (5,030) 0  
Currency translation differences 0 0  
Ending balance 9,596 15,579 14,793
Defined benefit plan obligation | USA | Settlement of pension liabilities      
Disclosure of net defined benefit liability (asset) [line items]      
Ending balance 5,052    
Defined benefit plan obligation | Rest of the world      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning balance 13,524 13,410  
Current service cost 215 179  
Interest expense 556 592  
Actuarial (gains) losses (22) 285  
Benefit payments (770) (757)  
Other movements 540 (63)  
Currency translation differences (997) (122)  
Ending balance 13,046 13,524 13,410
Defined benefit plan obligation | Germany      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning balance 3,647    
Ending balance 3,234 3,647  
Defined benefit plan obligation | Canada (Federal)      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning balance 3,930    
Ending balance 3,641 3,930  
Defined benefit plan obligation | Pensions | Funded pension plans      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning balance 71,473    
Ending balance $ 59,915 $ 71,473  
Duration of defined benefit obligation 13 years 14 years  
Defined benefit plan obligation | Pensions | Funded pension plans | The Netherlands      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning balance $ 26,746    
Ending balance $ 23,577 $ 26,746  
Duration of defined benefit obligation 15 years 16 years  
Defined benefit plan obligation | Pensions | Funded pension plans | UK      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning balance $ 18,734    
Ending balance $ 16,638 $ 18,734  
Duration of defined benefit obligation 12 years 15 years  
Defined benefit plan obligation | Pensions | Funded pension plans | USA      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning balance $ 14,695    
Ending balance $ 8,787 $ 14,695  
Duration of defined benefit obligation 12 years 11 years  
Defined benefit plan obligation | Pensions | Funded pension plans | Rest of the world      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning balance $ 11,298    
Ending balance $ 10,913 $ 11,298  
Duration of defined benefit obligation 13 years 13 years  
Defined benefit plan obligation | Pensions | Unfunded pension plans      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning balance $ 3,450    
Ending balance $ 3,261 $ 3,450  
Duration of defined benefit obligation 11 years 11 years  
Defined benefit plan obligation | Pensions | Unfunded pension plans | UK      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning balance $ 340    
Ending balance $ 319 $ 340  
Duration of defined benefit obligation 15 years 16 years  
Defined benefit plan obligation | Pensions | Unfunded pension plans | USA      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning balance $ 884    
Ending balance $ 809 $ 884  
Duration of defined benefit obligation 8 years 8 years  
Defined benefit plan obligation | Pensions | Unfunded pension plans | Rest of the world      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning balance $ 2,226    
Ending balance $ 2,133 $ 2,226  
Duration of defined benefit obligation 11 years 11 years  
Defined benefit plan obligation | OPEB      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning balance $ 3,101 $ 2,879  
Current service cost 38 36  
Interest expense 154 166  
Actuarial (gains) losses (77) 72  
Benefit payments (141) (88)  
Other movements (95) 0  
Currency translation differences (102) 36  
Ending balance 2,878 3,101 2,879
Defined benefit plan obligation | OPEB | Unfunded pension plans      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning balance 3,101    
Ending balance $ 2,878 $ 3,101  
Duration of defined benefit obligation 12 years 13 years  
Defined benefit plan assets      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning balance $ (79,961) $ (76,756)  
Interest expense (2,999) (3,417)  
Benefit payments 3,590 3,706  
Other movements 4,452 18  
Currency translation differences 3,337 (1,531)  
Ending balance (69,707) (79,961) (76,756)
Defined benefit plan assets | The Netherlands      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning balance (30,266) (27,986)  
Interest expense (946) (1,035)  
Benefit payments 1,076 1,032  
Other movements 9 6  
Currency translation differences 1,777 (1,020)  
Ending balance (28,330) (30,266) (27,986)
Defined benefit plan assets | UK      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning balance (22,320) (21,963)  
Interest expense (995) (1,094)  
Benefit payments 1,081 1,014  
Other movements 22 16  
Currency translation differences 270 (1,242)  
Ending balance (19,560) (22,320) (21,963)
Defined benefit plan assets | USA      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning balance (14,835) (14,243)  
Interest expense (487) (679)  
Benefit payments 702 957  
Other movements 4,891 13  
Currency translation differences 0 0  
Ending balance (9,425) (14,835) (14,243)
Defined benefit plan assets | USA | Settlement of pension liabilities      
Disclosure of net defined benefit liability (asset) [line items]      
Ending balance 4,920    
Defined benefit plan assets | Rest of the world      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning balance (12,540) (12,564)  
Interest expense (571) (609)  
Benefit payments 731 703  
Other movements (470) (17)  
Currency translation differences 1,290 731  
Ending balance (12,392) (12,540) $ (12,564)
Defined benefit plan assets | Germany      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning balance (2,730)    
Ending balance (2,705) (2,730)  
Defined benefit plan assets | Canada (Federal)      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning balance (3,504)    
Ending balance $ (3,179) $ (3,504)