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Fair value measurements (Financial Instruments Measured At Fair Value On Recurring Basis) (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Jun. 30, 2023
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]      
Debt Securities, Available-for-Sale $ 107,840 $ 106,571  
Equity securities 3,792 3,455  
Short-term investments 4,546 4,551  
Other Investments 7,513 5,527  
Securities lending collateral 1,889 1,299  
Separate account assets 5,834 5,573 $ 5,574
Market risk benefits 576 771  
Private equities 14,365 14,078  
Investment Funds Limited Partnerships Partially Owned Investment Companies Fair Value      
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]      
Private equities 14,365 14,078  
Policy Loans      
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]      
Other Investments 1,029 702  
U.S. Treasury / Agency      
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]      
Debt Securities, Available-for-Sale 2,741 3,590  
Non-U.S.      
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]      
Debt Securities, Available-for-Sale 34,918 35,164  
Corporate and asset-backed securities      
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]      
Debt Securities, Available-for-Sale 43,620 42,830  
Mortgage-backed securities      
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]      
Debt Securities, Available-for-Sale 24,614 22,058  
Municipal      
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]      
Debt Securities, Available-for-Sale 1,947 2,929  
Level 1 | Fair Value, Recurring      
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]      
Debt Securities, Available-for-Sale 2,128 2,911  
Equity securities 3,692 3,368  
Short-term investments 2,822 1,915  
Other Investments 581 [1] 589 [2]  
Securities lending collateral 0 0  
Investment derivatives 41 54  
Derivatives designated as hedging instruments 0 0  
Other derivative instruments 1    
Separate account assets 5,749 5,482  
Total assets measured at fair value 15,014 [1],[3] 14,319 [2],[4]  
Investment derivatives 169 136  
Derivatives designated as hedging instruments 0 0  
Other derivative instruments, liability 2 37  
Market risk benefits 0 [5] 0 [6]  
Total liabilities measured at fair value 171 173  
Level 1 | U.S. Treasury / Agency | Fair Value, Recurring      
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]      
Debt Securities, Available-for-Sale 2,128 2,911  
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 1 | Municipal | 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 102,351 100,339  
Equity securities 0 0  
Short-term investments 1,712 2,633  
Other Investments 5,903 [1] 4,236 [2]  
Securities lending collateral 1,889 1,299  
Investment derivatives 0 0  
Derivatives designated as hedging instruments 127 136  
Other derivative instruments 0    
Separate account assets 85 91  
Total assets measured at fair value 112,067 [1],[3] 108,734 [2],[4]  
Investment derivatives 0 0  
Derivatives designated as hedging instruments 96 128  
Other derivative instruments, liability 5 5  
Market risk benefits 0 [5] 0 [6]  
Total liabilities measured at fair value 101 133  
Level 2 | U.S. Treasury / Agency | Fair Value, Recurring      
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]      
Debt Securities, Available-for-Sale 613 679  
Level 2 | Non-U.S. | Fair Value, Recurring      
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]      
Debt Securities, Available-for-Sale 34,286 34,472  
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 40,911 40,208  
Level 2 | Mortgage-backed securities | Fair Value, Recurring      
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]      
Debt Securities, Available-for-Sale 24,594 22,051  
Level 2 | Municipal | Fair Value, Recurring      
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]      
Debt Securities, Available-for-Sale 1,947 2,929  
Level 3 | Fair Value, Recurring      
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]      
Debt Securities, Available-for-Sale 3,361 3,321  
Equity securities 100 87  
Short-term investments 12 3  
Other Investments 0 [1] 0 [2]  
Securities lending collateral 0 0  
Investment derivatives 0 0  
Derivatives designated as hedging instruments 0 0  
Other derivative instruments 0    
Separate account assets 0 0  
Total assets measured at fair value 3,473 [1],[3] 3,411 [2],[4]  
Investment derivatives 0 0  
Derivatives designated as hedging instruments 0 0  
Other derivative instruments, liability 0 0  
Market risk benefits 576 [5] 771 [6]  
Total liabilities measured at fair value 576 771  
Level 3 | U.S. Treasury / Agency | 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 632 692  
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 2,709 2,622  
Level 3 | Mortgage-backed securities | Fair Value, Recurring      
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]      
Debt Securities, Available-for-Sale 20 7  
Level 3 | Municipal | Fair Value, Recurring      
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]      
Debt Securities, Available-for-Sale 0 0  
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 107,840 106,571  
Equity securities 3,792 3,455  
Short-term investments 4,546 4,551  
Other Investments 6,484 [1] 4,825 [2]  
Securities lending collateral 1,889 1,299  
Investment derivatives 41 54  
Derivatives designated as hedging instruments 127 136  
Other derivative instruments 1    
Separate account assets 5,834 5,573  
Total assets measured at fair value 130,554 [1],[3] 126,464 [2],[4]  
Investment derivatives 169 136  
Derivatives designated as hedging instruments 96 128  
Other derivative instruments, liability 7 42  
Market risk benefits 576 [5] 771 [6]  
Total liabilities measured at fair value 848 1,077  
Total Level 1, Level 2, and Level 3 | U.S. Treasury / Agency | Fair Value, Recurring      
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]      
Debt Securities, Available-for-Sale 2,741 3,590  
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 34,918 35,164  
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 43,620 42,830  
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 24,614 22,058  
Total Level 1, Level 2, and Level 3 | Municipal | Fair Value, Recurring      
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]      
Debt Securities, Available-for-Sale $ 1,947 $ 2,929  
[1] Excluded from the table above are other investments of $1,029 million, principally policy loans, measured using NAV as a practical expedient.
[2] Excluded from the table above are other investments of $702 million, principally policy loans, measured using NAV as a practical expedient.
[3] Excluded from the table above are Private equities of $14,365 million, measured using NAV as a practical expedient.
[4] Excluded from the table above are Private equities of $14,078 million, measured using NAV as a practical expedient.
[5] Refer to Note 11 for additional information on Market risk benefits.
[6] Refer to Note 11 for additional information on Market risk benefits.