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Fair value measurements (Financial Instruments Measured At Fair Value On Recurring Basis) (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]      
Debt Securities, Available-for-Sale $ 121,788 $ 110,363  
Equity securities 10,377 9,151  
Short-term investments 4,380 5,142  
Other investments 10,182 8,597  
Securities lending collateral 1,899 1,445  
Separate account assets 6,810 6,231 $ 5,996
Market risk benefits 666 607  
Private equities 16,734 14,769  
Reserved alternative investment fund      
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]      
Equity securities 5,110 4,978  
Other Investments      
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]      
Other investments 1,438 1,241  
Investment Funds Limited Partnerships Partially Owned Investment Companies Fair Value      
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]      
Private equities 16,734 14,769  
U.S. and local government securities      
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]      
Debt Securities, Available-for-Sale 3,846 4,070  
Non-U.S.      
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]      
Debt Securities, Available-for-Sale 40,331 35,838  
Corporate and asset-backed securities      
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]      
Debt Securities, Available-for-Sale 47,451 43,207  
Mortgage-backed securities      
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]      
Debt Securities, Available-for-Sale 30,160 27,248  
Level 1 | Fair Value, Recurring      
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]      
Debt Securities, Available-for-Sale 1,665 1,765  
Equity securities 5,153 [1] 4,053 [2]  
Short-term investments 2,376 3,156  
Other investments 638 [3] 573 [4]  
Securities lending collateral 0 0  
Investment derivatives 22 41  
Derivatives designated as hedging instruments 0 0  
Other derivative instruments 5 35  
Separate account assets 6,733 6,165  
Total assets measured at fair value 16,592 [1],[3],[5] 15,788 [2],[4],[6]  
Investment derivatives 173 303  
Derivatives designated as hedging instruments 0 0  
Other derivative instruments, liability 11    
Market risk benefits 0 [7] 0 [8]  
Total liabilities measured at fair value 184 303  
Level 1 | U.S. and local government securities | Fair Value, Recurring      
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]      
Debt Securities, Available-for-Sale 1,665 1,765  
Level 1 | Non-U.S. | Fair Value, Recurring      
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]      
Debt Securities, Available-for-Sale 0 0  
Level 1 | Corporate and asset-backed securities | Fair Value, Recurring      
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]      
Debt Securities, Available-for-Sale 0 0  
Level 1 | Mortgage-backed securities | Fair Value, Recurring      
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]      
Debt Securities, Available-for-Sale 0 0  
Level 2 | Fair Value, Recurring      
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]      
Debt Securities, Available-for-Sale 116,282 105,100  
Equity securities 0 [1] 0 [2]  
Short-term investments 1,962 1,972  
Other investments 8,106 [3] 6,783 [4]  
Securities lending collateral 1,899 1,445  
Investment derivatives 0 0  
Derivatives designated as hedging instruments 261 146  
Other derivative instruments 0 0  
Separate account assets 77 66  
Total assets measured at fair value 128,587 [1],[3],[5] 115,512 [2],[4],[6]  
Investment derivatives 0 0  
Derivatives designated as hedging instruments 183 116  
Other derivative instruments, liability 5 2  
Market risk benefits 0 [7] 0 [8]  
Total liabilities measured at fair value 188 118  
Level 2 | U.S. and local government securities | Fair Value, Recurring      
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]      
Debt Securities, Available-for-Sale 2,181 2,305  
Level 2 | Non-U.S. | Fair Value, Recurring      
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]      
Debt Securities, Available-for-Sale 39,729 35,234  
Level 2 | Corporate and asset-backed securities | Fair Value, Recurring      
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]      
Debt Securities, Available-for-Sale 44,212 40,316  
Level 2 | Mortgage-backed securities | Fair Value, Recurring      
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]      
Debt Securities, Available-for-Sale 30,160 27,245  
Level 3 | Fair Value, Recurring      
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]      
Debt Securities, Available-for-Sale 3,841 3,498  
Equity securities 114 [1] 120 [2]  
Short-term investments 42 14  
Other investments 0 [3] 0 [4]  
Securities lending collateral 0 0  
Investment derivatives 0 0  
Derivatives designated as hedging instruments 0 0  
Other derivative instruments 0 0  
Separate account assets 0 0  
Total assets measured at fair value 3,997 [1],[3],[5] 3,632 [2],[4],[6]  
Investment derivatives 0 0  
Derivatives designated as hedging instruments 0 0  
Other derivative instruments, liability 0 0  
Market risk benefits 666 [7] 607 [8]  
Total liabilities measured at fair value 666 607  
Level 3 | U.S. and local government securities | Fair Value, Recurring      
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]      
Debt Securities, Available-for-Sale 0 0  
Level 3 | Non-U.S. | Fair Value, Recurring      
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]      
Debt Securities, Available-for-Sale 602 604  
Level 3 | Corporate and asset-backed securities | Fair Value, Recurring      
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]      
Debt Securities, Available-for-Sale 3,239 2,891  
Level 3 | Mortgage-backed securities | Fair Value, Recurring      
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]      
Debt Securities, Available-for-Sale 0 3  
Total Level 1, Level 2, and Level 3 | Fair Value, Recurring      
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]      
Debt Securities, Available-for-Sale 121,788 110,363  
Equity securities 5,267 [1] 4,173 [2]  
Short-term investments 4,380 5,142  
Other investments 8,744 [3] 7,356 [4]  
Securities lending collateral 1,899 1,445  
Investment derivatives 22 41  
Derivatives designated as hedging instruments 261 146  
Other derivative instruments 5 35  
Separate account assets 6,810 6,231  
Total assets measured at fair value 149,176 [1],[3],[5] 134,932 [2],[4],[6]  
Investment derivatives 173 303  
Derivatives designated as hedging instruments 183 116  
Other derivative instruments, liability 16 2  
Market risk benefits 666 [7] 607 [8]  
Total liabilities measured at fair value 1,038 1,028  
Total Level 1, Level 2, and Level 3 | U.S. and local government securities | Fair Value, Recurring      
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]      
Debt Securities, Available-for-Sale 3,846 4,070  
Total Level 1, Level 2, and Level 3 | Non-U.S. | Fair Value, Recurring      
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]      
Debt Securities, Available-for-Sale 40,331 35,838  
Total Level 1, Level 2, and Level 3 | Corporate and asset-backed securities | Fair Value, Recurring      
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]      
Debt Securities, Available-for-Sale 47,451 43,207  
Total Level 1, Level 2, and Level 3 | Mortgage-backed securities | Fair Value, Recurring      
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]      
Debt Securities, Available-for-Sale $ 30,160 $ 27,248  
[1] Excluded from the table above is a fund of $5,110 million, measured using NAV as a practical expedient.
[2] Excluded from the table above is a fund of $4,978 million, measured using NAV as a practical expedient.
[3] Excluded from the table above are other investments of $1,438 million, principally policy loans, measured using NAV as a practical expedient.
[4] Excluded from the table above are other investments of $1,241 million, principally policy loans, measured using NAV as a practical expedient.
[5] Excluded from the table above are private equities of $16,734 million, measured using NAV as a practical expedient.
[6] Excluded from the table above are private equities of $14,769 million, measured using NAV as a practical expedient.
[7] Refer to Note 11 for additional information on Market risk benefits.
[8] Refer to Note 11 for additional information on Market risk benefits.