v3.26.1
Fair Value - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Assets and Liabilities Measured at Fair Value [Abstract]    
Fixed maturities available-for-sale $ 43,829 $ 43,351
Fixed maturities trading 291 633
Total fixed maturities 44,120 43,984
Equity securities 1,333 1,292
Short-term and other 5,428 5,871
Receivables 83  
Other liabilities (18)  
Payable to brokers (52) (43)
Corporate bonds and other    
Assets and Liabilities Measured at Fair Value [Abstract]    
Fixed maturities available-for-sale 26,211 26,250
States, municipalities and political subdivisions    
Assets and Liabilities Measured at Fair Value [Abstract]    
Fixed maturities available-for-sale 8,835 8,431
Asset-backed    
Assets and Liabilities Measured at Fair Value [Abstract]    
Fixed maturities available-for-sale 8,783 8,670
Fixed maturities available-for-sale    
Assets and Liabilities Measured at Fair Value [Abstract]    
Fixed maturities available-for-sale 43,829 43,351
Fixed maturities trading    
Assets and Liabilities Measured at Fair Value [Abstract]    
Fixed maturities trading 291 633
Level 1    
Assets and Liabilities Measured at Fair Value [Abstract]    
Total fixed maturities 532 841
Equity securities 793 762
Short-term and other 5,396 5,820
Receivables  
Other liabilities  
Payable to brokers (52) (43)
Level 1 | Corporate bonds and other    
Assets and Liabilities Measured at Fair Value [Abstract]    
Fixed maturities available-for-sale 243 238
Level 1 | States, municipalities and political subdivisions    
Assets and Liabilities Measured at Fair Value [Abstract]    
Fixed maturities available-for-sale
Level 1 | Asset-backed    
Assets and Liabilities Measured at Fair Value [Abstract]    
Fixed maturities available-for-sale
Level 1 | Fixed maturities available-for-sale    
Assets and Liabilities Measured at Fair Value [Abstract]    
Fixed maturities available-for-sale 243 238
Level 1 | Fixed maturities trading    
Assets and Liabilities Measured at Fair Value [Abstract]    
Fixed maturities trading 289 603
Level 2    
Assets and Liabilities Measured at Fair Value [Abstract]    
Total fixed maturities 41,007 40,617
Equity securities 510 497
Short-term and other 32 51
Receivables 83  
Other liabilities (18)  
Payable to brokers
Level 2 | Corporate bonds and other    
Assets and Liabilities Measured at Fair Value [Abstract]    
Fixed maturities available-for-sale 24,374 24,529
Level 2 | States, municipalities and political subdivisions    
Assets and Liabilities Measured at Fair Value [Abstract]    
Fixed maturities available-for-sale 8,791 8,386
Level 2 | Asset-backed    
Assets and Liabilities Measured at Fair Value [Abstract]    
Fixed maturities available-for-sale 7,840 7,672
Level 2 | Fixed maturities available-for-sale    
Assets and Liabilities Measured at Fair Value [Abstract]    
Fixed maturities available-for-sale 41,005 40,587
Level 2 | Fixed maturities trading    
Assets and Liabilities Measured at Fair Value [Abstract]    
Fixed maturities trading 2 30
Level 3    
Assets and Liabilities Measured at Fair Value [Abstract]    
Total fixed maturities 2,581 2,526
Equity securities 30 33
Short-term and other
Receivables  
Other liabilities  
Payable to brokers
Level 3 | Corporate bonds and other    
Assets and Liabilities Measured at Fair Value [Abstract]    
Fixed maturities available-for-sale 1,594 1,483
Level 3 | States, municipalities and political subdivisions    
Assets and Liabilities Measured at Fair Value [Abstract]    
Fixed maturities available-for-sale 44 45
Level 3 | Asset-backed    
Assets and Liabilities Measured at Fair Value [Abstract]    
Fixed maturities available-for-sale 943 998
Level 3 | Fixed maturities available-for-sale    
Assets and Liabilities Measured at Fair Value [Abstract]    
Fixed maturities available-for-sale 2,581 2,526
Level 3 | Fixed maturities trading    
Assets and Liabilities Measured at Fair Value [Abstract]    
Fixed maturities trading