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Measurement of financial assets and liabilities - Valuation approach for level 3 (Details) - At fair value - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Financial instruments    
Net financial instruments at fair value $ 150,521 $ 146,384
Level 3    
Financial instruments    
Net financial instruments at fair value $ 3,154 $ 2,904
Percentage using valuation method 2.00% 2.00%
Level 3 | Participating and unit-linked funds    
Financial instruments    
Net financial instruments at fair value $ 3,088 $ 2,866
Level 3 | Other investments    
Financial instruments    
Net financial instruments at fair value $ 66 $ 38
Reasonably possible decrease in valuation (as a percent) 10.00% 10.00%
Amount of reasonably possible decrease in valuation $ (7) $ (4)
Level 3 | Equity-type securities | Internal valuation    
Financial instruments    
Net financial instruments at fair value $ 1 1
Percentage using valuation method 0.10%  
Level 3 | Equity securities and portfolio holdings in collective investment schemes    
Financial instruments    
Net financial instruments at fair value $ 3,116 2,863
Level 3 | Other sundry individual financial investments    
Financial instruments    
Net financial instruments at fair value $ 37 $ 40