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Fair Value of Assets and Liabilities - Schedule of Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Assets |  |
Fixed income securities, at fair value | $ 54,435 | $ 52,747
Equity securities | 2,397 | 4,463
Short-term investments | 9,640 | 4,537
Other investments | 964 | 824
Assets held for sale | 715 | 3,092
Total assets at fair value | 66,783 | 63,521
Counterparty and cash collateral netting | (2) | (19)
Total | 67,736 | 64,617
Liabilities |  |
Preferred stock measured at cost | 150 | 150
U.S. government and agencies |  |
Assets |  |
Fixed income securities, at fair value | 15,712 | 11,108
Municipal |  |
Assets |  |
Fixed income securities, at fair value | 7,286 | 8,842
Foreign government |  |
Assets |  |
Fixed income securities, at fair value | 1,391 | 1,364
ABS |  |
Assets |  |
Fixed income securities, at fair value | 983 | 1,145
MBS |  |
Assets |  |
Fixed income securities, at fair value | 1,101 | 96
Quoted prices in active markets for identical assets (Level 1) |  |
Assets |  |
Total assets at fair value | 21,266 | 16,956
Significant other observable inputs (Level 2) |  |
Assets |  |
Total assets at fair value | 44,744 | 45,779
Significant unobservable inputs (Level 3) |  |
Assets |  |
Total assets at fair value | 775 | 805
Reported to NAV |  |
Assets |  |
Investments reported at NAV | 953 | 1,096
Recurring basis |  |
Assets |  |
Fixed income securities, at fair value | 54,435 | 52,747
Equity securities | 2,247 | 4,313
Short-term investments | 9,640 | 4,537
Other investments | 1 | 3
Other investments | (2) | (19)
Other assets | 138 | 134
Assets held for sale | 320 | 1,784
Total assets at fair value | 66,781 | 63,518
Counterparty and cash collateral netting | (2) | (19)
Liabilities |  |
Other liabilities | (15) | (1)
Other liabilities | 38 | 1
Counterparty and cash collateral netting | 38 | 1
Total recurring basis liabilities | (15) | (1)
Recurring basis | U.S. government and agencies |  |
Assets |  |
Fixed income securities, at fair value | 15,712 | 11,108
Recurring basis | Municipal |  |
Assets |  |
Fixed income securities, at fair value | 7,286 | 8,842
Recurring basis | Corporate - public |  |
Assets |  |
Fixed income securities, at fair value | 19,006 | 21,233
Recurring basis | Corporate - privately placed |  |
Assets |  |
Fixed income securities, at fair value | 8,956 | 8,959
Recurring basis | Foreign government |  |
Assets |  |
Fixed income securities, at fair value | 1,391 | 1,364
Recurring basis | ABS |  |
Assets |  |
Fixed income securities, at fair value | 983 | 1,145
Recurring basis | MBS |  |
Assets |  |
Fixed income securities, at fair value | 1,101 | 96
Recurring basis | Quoted prices in active markets for identical assets (Level 1) |  |
Assets |  |
Fixed income securities, at fair value | 15,703 | 11,099
Equity securities | 1,611 | 3,600
Short-term investments | 3,756 | 2,016
Other investments | 0 | 0
Other assets | 1 | 0
Assets held for sale | 195 | 241
Total assets at fair value | 21,266 | 16,956
Liabilities |  |
Other liabilities | (3) | (1)
Total recurring basis liabilities | (3) | (1)
Recurring basis | Quoted prices in active markets for identical assets (Level 1) | U.S. government and agencies |  |
Assets |  |
Fixed income securities, at fair value | 15,703 | 11,099
Recurring basis | Quoted prices in active markets for identical assets (Level 1) | Municipal |  |
Assets |  |
Fixed income securities, at fair value | 0 | 0
Recurring basis | Quoted prices in active markets for identical assets (Level 1) | Corporate - public |  |
Assets |  |
Fixed income securities, at fair value | 0 | 0
Recurring basis | Quoted prices in active markets for identical assets (Level 1) | Corporate - privately placed |  |
Assets |  |
Fixed income securities, at fair value | 0 | 0
Recurring basis | Quoted prices in active markets for identical assets (Level 1) | Foreign government |  |
Assets |  |
Fixed income securities, at fair value | 0 | 0
Recurring basis | Quoted prices in active markets for identical assets (Level 1) | ABS |  |
Assets |  |
Fixed income securities, at fair value | 0 | 0
Recurring basis | Quoted prices in active markets for identical assets (Level 1) | MBS |  |
Assets |  |
Fixed income securities, at fair value | 0 | 0
Recurring basis | Significant other observable inputs (Level 2) |  |
Assets |  |
Fixed income securities, at fair value | 38,459 | 41,400
Equity securities | 278 | 306
Short-term investments | 5,880 | 2,516
Other investments | 2 | 21
Other assets | 0 | 0
Assets held for sale | 125 | 1,536
Total assets at fair value | 44,744 | 45,779
Liabilities |  |
Other liabilities | (49) | (1)
Total recurring basis liabilities | (49) | (1)
Recurring basis | Significant other observable inputs (Level 2) | U.S. government and agencies |  |
Assets |  |
Fixed income securities, at fair value | 9 | 9
Recurring basis | Significant other observable inputs (Level 2) | Municipal |  |
Assets |  |
Fixed income securities, at fair value | 7,284 | 8,840
Recurring basis | Significant other observable inputs (Level 2) | Corporate - public |  |
Assets |  |
Fixed income securities, at fair value | 18,971 | 21,211
Recurring basis | Significant other observable inputs (Level 2) | Corporate - privately placed |  |
Assets |  |
Fixed income securities, at fair value | 8,847 | 8,849
Recurring basis | Significant other observable inputs (Level 2) | Foreign government |  |
Assets |  |
Fixed income securities, at fair value | 1,391 | 1,364
Recurring basis | Significant other observable inputs (Level 2) | ABS |  |
Assets |  |
Fixed income securities, at fair value | 944 | 1,119
Recurring basis | Significant other observable inputs (Level 2) | MBS |  |
Assets |  |
Fixed income securities, at fair value | 1,013 | 8
Recurring basis | Significant unobservable inputs (Level 3) |  |
Assets |  |
Fixed income securities, at fair value | 273 | 248
Equity securities | 358 | 407
Short-term investments | 4 | 5
Other investments | 1 | 1
Other assets | 137 | 134
Assets held for sale | 0 | 7
Total assets at fair value | 773 | 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, at fair value | 0 | 0
Recurring basis | Significant unobservable inputs (Level 3) | Municipal |  |
Assets |  |
Fixed income securities, at fair value | 2 | 2
Recurring basis | Significant unobservable inputs (Level 3) | Corporate - public |  |
Assets |  |
Fixed income securities, at fair value | 35 | 22
Recurring basis | Significant unobservable inputs (Level 3) | Corporate - privately placed |  |
Assets |  |
Fixed income securities, at fair value | 109 | 110
Recurring basis | Significant unobservable inputs (Level 3) | Foreign government |  |
Assets |  |
Fixed income securities, at fair value | 0 | 0
Recurring basis | Significant unobservable inputs (Level 3) | ABS |  |
Assets |  |
Fixed income securities, at fair value | 39 | 26
Recurring basis | Significant unobservable inputs (Level 3) | MBS |  |
Assets |  |
Fixed income securities, at fair value | 88 | 88
Non-recurring basis |  |
Assets |  |
Total assets at fair value | 2 | 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 | $ 2 | $ 3

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