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Fair Value of Financial Instruments - Schedule of Fair Value Hierarchy Measurements of Financial Instruments (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Jun. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Dec. 31, 2023
Financial assets            
Equity securities $ 1,212   $ 1,142      
Short-term investments 1,435   4,177      
Derivative assets 1,516   1,346      
Separate account assets 1,195   1,343      
Financial liabilities            
Market risk benefits 4,505   3,655      
Other liabilities – derivative liabilities 144   5      
Separate account liabilities 1,195 $ 1,322 1,343 $ 1,302 $ 1,266 $ 1,189
Separate accounts not subject to fair value hierarchy 29   31      
Total Fair Value            
Financial assets            
Total available-for-sale fixed maturity securities 55,408   47,292      
Equity securities 1,212   1,142      
Real estate at fair value 1,254   1,283      
Real estate partnerships at fair value 1,714   932      
Investment funds 147   124      
Short-term investments 1,435   4,177      
Derivative assets 1,458   1,341      
Collaterals received on derivatives (excluding excess collateral) (1,384)   (1,298)      
Separately managed accounts 56   71      
Other 201   315      
Cash and cash equivalents 11,568   11,330      
Other assets – market risk benefit assets 1,110   857      
Separate account assets 1,166   1,312      
Total financial assets 75,345   68,878      
Financial liabilities            
Policyholders’ account balances – embedded derivative 6,341   1,123      
Market risk benefits 4,505   3,655      
Funds withheld for reinsurance liabilities – embedded derivatives 83   37      
Other liabilities – derivative liabilities 86          
Separate account liabilities 1,166   1,312      
Total financial liabilities 12,181   6,127      
Total Fair Value | U.S. treasury and government            
Financial assets            
Total available-for-sale fixed maturity securities 93   86      
Total Fair Value | U.S. state and municipal            
Financial assets            
Total available-for-sale fixed maturity securities 3,134   3,207      
Total Fair Value | Foreign governments            
Financial assets            
Total available-for-sale fixed maturity securities 1,240   1,541      
Total Fair Value | Corporate debt securities            
Financial assets            
Total available-for-sale fixed maturity securities 41,581   32,848      
Total Fair Value | Residential mortgage-backed securities            
Financial assets            
Total available-for-sale fixed maturity securities 992   1,106      
Total Fair Value | Commercial mortgage-backed securities            
Financial assets            
Total available-for-sale fixed maturity securities 3,291   2,796      
Total Fair Value | Collateralized debt securities            
Financial assets            
Total available-for-sale fixed maturity securities 5,077   5,708      
Total Fair Value | Common stock            
Financial assets            
Equity securities 778   747      
Total Fair Value | Preferred stock            
Financial assets            
Equity securities 434   391      
Total Fair Value | Private equity and other            
Financial assets            
Equity securities 0   4      
Level 1            
Financial assets            
Total available-for-sale fixed maturity securities 80   76      
Equity securities 776   628      
Real estate at fair value 0   0      
Real estate partnerships at fair value 0   0      
Investment funds 0   0      
Short-term investments 38   3,003      
Derivative assets 0   0      
Collaterals received on derivatives (excluding excess collateral) (1,384)   (1,298)      
Separately managed accounts 0   0      
Other 0   0      
Cash and cash equivalents 11,568   11,330      
Other assets – market risk benefit assets 0   0      
Separate account assets 1,027   258      
Total financial assets 12,105   13,997      
Financial liabilities            
Policyholders’ account balances – embedded derivative 0   0      
Market risk benefits 0   0      
Funds withheld for reinsurance liabilities – embedded derivatives 0   0      
Other liabilities – derivative liabilities 0          
Separate account liabilities 1,027   258      
Total financial liabilities 1,027   258      
Level 1 | U.S. treasury and government            
Financial assets            
Total available-for-sale fixed maturity securities 80   76      
Level 1 | U.S. state and municipal            
Financial assets            
Total available-for-sale fixed maturity securities 0   0      
Level 1 | Foreign governments            
Financial assets            
Total available-for-sale fixed maturity securities 0   0      
Level 1 | Corporate debt securities            
Financial assets            
Total available-for-sale fixed maturity securities 0   0      
Level 1 | Residential mortgage-backed securities            
Financial assets            
Total available-for-sale fixed maturity securities 0   0      
Level 1 | Commercial mortgage-backed securities            
Financial assets            
Total available-for-sale fixed maturity securities 0   0      
Level 1 | Collateralized debt securities            
Financial assets            
Total available-for-sale fixed maturity securities 0   0      
Level 1 | Common stock            
Financial assets            
Equity securities 771   606      
Level 1 | Preferred stock            
Financial assets            
Equity securities 5   22      
Level 1 | Private equity and other            
Financial assets            
Equity securities 0   0      
Level 2            
Financial assets            
Total available-for-sale fixed maturity securities 51,701   41,779      
Equity securities 47   37      
Real estate at fair value 0   0      
Real estate partnerships at fair value 0   0      
Investment funds 0   0      
Short-term investments 872   821      
Derivative assets 1,245   1,118      
Collaterals received on derivatives (excluding excess collateral) 0   0      
Separately managed accounts 0   0      
Other 2   11      
Cash and cash equivalents 0   0      
Other assets – market risk benefit assets 0   0      
Separate account assets 139   1,054      
Total financial assets 54,006   44,820      
Financial liabilities            
Policyholders’ account balances – embedded derivative 0   0      
Market risk benefits 0   0      
Funds withheld for reinsurance liabilities – embedded derivatives 0   0      
Other liabilities – derivative liabilities 86          
Separate account liabilities 139   1,054      
Total financial liabilities 225   1,054      
Level 2 | U.S. treasury and government            
Financial assets            
Total available-for-sale fixed maturity securities 13   10      
Level 2 | U.S. state and municipal            
Financial assets            
Total available-for-sale fixed maturity securities 3,077   3,151      
Level 2 | Foreign governments            
Financial assets            
Total available-for-sale fixed maturity securities 1,240   1,541      
Level 2 | Corporate debt securities            
Financial assets            
Total available-for-sale fixed maturity securities 40,830   30,192      
Level 2 | Residential mortgage-backed securities            
Financial assets            
Total available-for-sale fixed maturity securities 964   1,087      
Level 2 | Commercial mortgage-backed securities            
Financial assets            
Total available-for-sale fixed maturity securities 3,261   2,721      
Level 2 | Collateralized debt securities            
Financial assets            
Total available-for-sale fixed maturity securities 2,316   3,077      
Level 2 | Common stock            
Financial assets            
Equity securities 2   25      
Level 2 | Preferred stock            
Financial assets            
Equity securities 45   12      
Level 2 | Private equity and other            
Financial assets            
Equity securities 0   0      
Level 3            
Financial assets            
Total available-for-sale fixed maturity securities 3,627   5,437      
Equity securities 389   477      
Real estate at fair value 1,254   1,283      
Real estate partnerships at fair value 1,714   932      
Investment funds 147   124      
Short-term investments 525   353      
Derivative assets 213   223      
Collaterals received on derivatives (excluding excess collateral) 0   0      
Separately managed accounts 56   71      
Other 199   304      
Cash and cash equivalents 0   0      
Other assets – market risk benefit assets 1,110   857      
Separate account assets 0   0      
Total financial assets 9,234   10,061      
Financial liabilities            
Policyholders’ account balances – embedded derivative 6,341   1,123      
Market risk benefits 4,505   3,655      
Funds withheld for reinsurance liabilities – embedded derivatives 83   37      
Other liabilities – derivative liabilities 0          
Separate account liabilities 0   0      
Total financial liabilities 10,929   4,815      
Level 3 | U.S. treasury and government            
Financial assets            
Total available-for-sale fixed maturity securities 0   0      
Level 3 | U.S. state and municipal            
Financial assets            
Total available-for-sale fixed maturity securities 57   56      
Level 3 | Foreign governments            
Financial assets            
Total available-for-sale fixed maturity securities 0   0      
Level 3 | Corporate debt securities            
Financial assets            
Total available-for-sale fixed maturity securities 751   2,656      
Level 3 | Residential mortgage-backed securities            
Financial assets            
Total available-for-sale fixed maturity securities 28   19      
Level 3 | Commercial mortgage-backed securities            
Financial assets            
Total available-for-sale fixed maturity securities 30   75      
Level 3 | Collateralized debt securities            
Financial assets            
Total available-for-sale fixed maturity securities 2,761   2,631      
Level 3 | Common stock            
Financial assets            
Equity securities 5   116      
Level 3 | Preferred stock            
Financial assets            
Equity securities 384   357      
Level 3 | Private equity and other            
Financial assets            
Equity securities 0   4      
Fair Value Measured at Net Asset Value Per Share            
Financial assets            
Investment funds $ 334   $ 353