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Fair Value of Assets and Liabilities - Schedule of Assets and Liabilities Measured at Fair Value (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Assets    
Fixed income securities $ 59,115 $ 52,747
Equity securities 8,398 4,463
Short-term investments 4,887 4,537
Other investments 1,114 824
Assets held for sale 0 3,092
Counterparty and cash collateral netting (1) (19)
Total assets at fair value 72,025 63,521
Total 73,291 64,617
Liabilities    
Other liabilities (258) (215)
Preferred stock measured at cost 99 150
Equity method investments 466  
Equity securities 8,026 4,329
U.S. government and agencies    
Assets    
Fixed income securities 18,133 11,108
Municipal    
Assets    
Fixed income securities 5,643 8,842
Foreign government    
Assets    
Fixed income securities 1,460 1,364
ABS    
Assets    
Fixed income securities 1,352 1,145
MBS    
Assets    
Fixed income securities 2,126 96
Quoted prices in active markets for identical assets (Level 1)    
Assets    
Total assets at fair value 27,487 16,956
Significant other observable inputs (Level 2)    
Assets    
Total assets at fair value 44,023 45,779
Significant unobservable inputs (Level 3)    
Assets    
Total assets at fair value 516 805
Reported at NAV    
Assets    
Investments reported at NAV 1,266 1,096
Liabilities    
Equity securities 466  
Limited partnerships 800  
Recurring Basis    
Assets    
Fixed income securities 59,115 52,747
Equity securities 7,833 4,313
Short-term investments 4,887 4,537
Other investments 11 3
Other investments (1) (19)
Other assets 147 134
Assets held for sale   1,784
Counterparty and cash collateral netting (1) (19)
Total assets at fair value 71,993 63,518
Liabilities    
Other liabilities (3) (1)
Other liabilities 19 1
Counterparty and cash collateral netting 19 1
Total recurring basis liabilities (3) (1)
Recurring Basis | U.S. government and agencies    
Assets    
Fixed income securities 18,133 11,108
Recurring Basis | Municipal    
Assets    
Fixed income securities 5,643 8,842
Recurring Basis | Corporate - public    
Assets    
Fixed income securities 19,919 21,233
Recurring Basis | Corporate - privately placed    
Assets    
Fixed income securities 10,482 8,959
Recurring Basis | Foreign government    
Assets    
Fixed income securities 1,460 1,364
Recurring Basis | ABS    
Assets    
Fixed income securities 1,352 1,145
Recurring Basis | MBS    
Assets    
Fixed income securities 2,126 96
Recurring Basis | Quoted prices in active markets for identical assets (Level 1)    
Assets    
Fixed income securities 18,124 11,099
Equity securities 7,572 3,600
Short-term investments 1,791 2,016
Other investments 0 0
Other assets 0 0
Assets held for sale   241
Total assets at fair value 27,487 16,956
Liabilities    
Other liabilities (2) (1)
Total recurring basis liabilities (2) (1)
Recurring Basis | Quoted prices in active markets for identical assets (Level 1) | U.S. government and agencies    
Assets    
Fixed income securities 18,124 11,099
Recurring Basis | Quoted prices in active markets for identical assets (Level 1) | Municipal    
Assets    
Fixed income securities 0 0
Recurring Basis | Quoted prices in active markets for identical assets (Level 1) | Corporate - public    
Assets    
Fixed income securities 0 0
Recurring Basis | Quoted prices in active markets for identical assets (Level 1) | Corporate - privately placed    
Assets    
Fixed income securities 0 0
Recurring Basis | Quoted prices in active markets for identical assets (Level 1) | Foreign government    
Assets    
Fixed income securities 0 0
Recurring Basis | Quoted prices in active markets for identical assets (Level 1) | ABS    
Assets    
Fixed income securities 0 0
Recurring Basis | Quoted prices in active markets for identical assets (Level 1) | MBS    
Assets    
Fixed income securities 0 0
Recurring Basis | Significant other observable inputs (Level 2)    
Assets    
Fixed income securities 40,683 41,400
Equity securities 239 306
Short-term investments 3,090 2,516
Other investments 11 21
Other assets 0 0
Assets held for sale   1,536
Total assets at fair value 44,023 45,779
Liabilities    
Other liabilities (19) (1)
Total recurring basis liabilities (19) (1)
Recurring Basis | Significant other observable inputs (Level 2) | U.S. government and agencies    
Assets    
Fixed income securities 9 9
Recurring Basis | Significant other observable inputs (Level 2) | Municipal    
Assets    
Fixed income securities 5,614 8,840
Recurring Basis | Significant other observable inputs (Level 2) | Corporate - public    
Assets    
Fixed income securities 19,907 21,211
Recurring Basis | Significant other observable inputs (Level 2) | Corporate - privately placed    
Assets    
Fixed income securities 10,295 8,849
Recurring Basis | Significant other observable inputs (Level 2) | Foreign government    
Assets    
Fixed income securities 1,460 1,364
Recurring Basis | Significant other observable inputs (Level 2) | ABS    
Assets    
Fixed income securities 1,330 1,119
Recurring Basis | Significant other observable inputs (Level 2) | MBS    
Assets    
Fixed income securities 2,068 8
Recurring Basis | Significant unobservable inputs (Level 3)    
Assets    
Fixed income securities 308 248
Equity securities 22 407
Short-term investments 6 5
Other investments 1 1
Other assets 147 134
Assets held for sale   7
Total assets at fair value 484 802
Liabilities    
Other liabilities (1) 0
Total recurring basis liabilities (1) 0
Recurring Basis | Significant unobservable inputs (Level 3) | U.S. government and agencies    
Assets    
Fixed income securities 0 0
Recurring Basis | Significant unobservable inputs (Level 3) | Municipal    
Assets    
Fixed income securities 29 2
Recurring Basis | Significant unobservable inputs (Level 3) | Corporate - public    
Assets    
Fixed income securities 12 22
Recurring Basis | Significant unobservable inputs (Level 3) | Corporate - privately placed    
Assets    
Fixed income securities 187 110
Recurring Basis | Significant unobservable inputs (Level 3) | Foreign government    
Assets    
Fixed income securities 0 0
Recurring Basis | Significant unobservable inputs (Level 3) | ABS    
Assets    
Fixed income securities 22 26
Recurring Basis | Significant unobservable inputs (Level 3) | MBS    
Assets    
Fixed income securities 58 88
Non-recurring basis    
Assets    
Total assets at fair value 32 3
Non-recurring basis | Quoted prices in active markets for identical assets (Level 1)    
Assets    
Total assets at fair value 0 0
Non-recurring basis | Significant other observable inputs (Level 2)    
Assets    
Total assets at fair value 0 0
Non-recurring basis | Significant unobservable inputs (Level 3)    
Assets    
Total assets at fair value $ 32 $ 3