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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
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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

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