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Fair Value of Assets and Liabilities - Schedule of Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Assets |  |
Fixed income securities, at fair value | $ 50,777 | $ 48,865
Equity securities | 2,383 | 2,411
Short-term investments | 4,318 | 5,144
Other investments | 1,004 | 1,055
Total assets at fair value | 57,452 | 56,409
Counterparty and cash collateral netting | $ (4) | $ (2)
% of total assets at fair value | 0.00% | 0.00%
Total | $ 58,598 | $ 57,574
Liabilities |  |
% of total liabilities at fair value | (100.00%) | (200.00%)
Preferred stock measured at cost | $ 150 | $ 150
Fair value |  |
Assets |  |
% of total assets at fair value | 100.00% | 100.00%
Liabilities |  |
% of total liabilities at fair value | 100.00% | 100.00%
U.S. government and agencies |  |
Assets |  |
Fixed income securities, at fair value | $ 10,030 | $ 8,619
Municipal |  |
Assets |  |
Fixed income securities, at fair value | 5,392 | 6,006
Foreign government |  |
Assets |  |
Fixed income securities, at fair value | 1,240 | 1,290
ABS |  |
Assets |  |
Fixed income securities, at fair value | 1,846 | 1,745
Quoted prices in active markets for identical assets (Level 1) |  |
Assets |  |
Total assets at fair value | $ 13,744 | $ 11,941
% of total assets at fair value | 23.90% | 21.20%
Liabilities |  |
% of total liabilities at fair value | 66.70% | 50.00%
Significant other observable inputs (Level 2) |  |
Assets |  |
Total assets at fair value | $ 43,018 | $ 43,779
% of total assets at fair value | 74.90% | 77.60%
Liabilities |  |
% of total liabilities at fair value | 133.30% | 250.00%
Significant unobservable inputs (Level 3) |  |
Assets |  |
Total assets at fair value | $ 694 | $ 691
% of total assets at fair value | 1.20% | 1.20%
Liabilities |  |
% of total liabilities at fair value | 0.00% | 0.00%
Fair Value Net Asset Value |  |
Assets |  |
Investments reported at NAV | $ 1,146 | $ 1,165
Recurring basis |  |
Assets |  |
Fixed income securities, at fair value | 50,777 | 48,865
Equity securities | 2,233 | 2,261
Short-term investments | 4,318 | 5,144
Other investments | 3 | 3
Other investments | (4) | (2)
Other assets | 121 | 121
Total assets at fair value | 57,452 | 56,394
Counterparty and cash collateral netting | (4) | (2)
Liabilities |  |
Other liabilities | (3) | (4)
Other liabilities | 3 | 8
Total recurring basis liabilities | (3) | (4)
Counterparty and cash collateral netting | 3 | 8
Recurring basis | U.S. government and agencies |  |
Assets |  |
Fixed income securities, at fair value | 10,030 | 8,619
Recurring basis | Municipal |  |
Assets |  |
Fixed income securities, at fair value | 5,392 | 6,006
Recurring basis | Corporate - public |  |
Assets |  |
Fixed income securities, at fair value | 23,870 | 23,298
Recurring basis | Corporate - privately placed |  |
Assets |  |
Fixed income securities, at fair value | 8,399 | 7,907
Recurring basis | Foreign government |  |
Assets |  |
Fixed income securities, at fair value | 1,240 | 1,290
Recurring basis | ABS |  |
Assets |  |
Fixed income securities, at fair value | 1,846 | 1,745
Recurring basis | Quoted prices in active markets for identical assets (Level 1) |  |
Assets |  |
Fixed income securities, at fair value | 10,016 | 8,606
Equity securities | 1,607 | 1,656
Short-term investments | 2,120 | 1,676
Other investments | 0 | 0
Other assets | 1 | 3
Total assets at fair value | 13,744 | 11,941
Liabilities |  |
Other liabilities | (2) | (2)
Total recurring basis liabilities | (2) | (2)
Recurring basis | Quoted prices in active markets for identical assets (Level 1) | U.S. government and agencies |  |
Assets |  |
Fixed income securities, at fair value | 10,016 | 8,606
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 | Significant other observable inputs (Level 2) |  |
Assets |  |
Fixed income securities, at fair value | 40,618 | 40,106
Equity securities | 218 | 203
Short-term investments | 2,177 | 3,467
Other investments | 5 | 3
Other assets | 0 | 0
Total assets at fair value | 43,018 | 43,779
Liabilities |  |
Other liabilities | (4) | (10)
Total recurring basis liabilities | (4) | (10)
Recurring basis | Significant other observable inputs (Level 2) | U.S. government and agencies |  |
Assets |  |
Fixed income securities, at fair value | 14 | 13
Recurring basis | Significant other observable inputs (Level 2) | Municipal |  |
Assets |  |
Fixed income securities, at fair value | 5,384 | 5,995
Recurring basis | Significant other observable inputs (Level 2) | Corporate - public |  |
Assets |  |
Fixed income securities, at fair value | 23,847 | 23,272
Recurring basis | Significant other observable inputs (Level 2) | Corporate - privately placed |  |
Assets |  |
Fixed income securities, at fair value | 8,345 | 7,849
Recurring basis | Significant other observable inputs (Level 2) | Foreign government |  |
Assets |  |
Fixed income securities, at fair value | 1,240 | 1,290
Recurring basis | Significant other observable inputs (Level 2) | ABS |  |
Assets |  |
Fixed income securities, at fair value | 1,788 | 1,687
Recurring basis | Significant unobservable inputs (Level 3) |  |
Assets |  |
Fixed income securities, at fair value | 143 | 153
Equity securities | 408 | 402
Short-term investments | 21 | 1
Other investments | 2 | 2
Other assets | 120 | 118
Total assets at fair value | 694 | 676
Liabilities |  |
Other liabilities | 0 | 0
Total recurring basis liabilities | 0 | 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 | 8 | 11
Recurring basis | Significant unobservable inputs (Level 3) | Corporate - public |  |
Assets |  |
Fixed income securities, at fair value | 23 | 26
Recurring basis | Significant unobservable inputs (Level 3) | Corporate - privately placed |  |
Assets |  |
Fixed income securities, at fair value | 54 | 58
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 | 58 | 58
Non-recurring basis |  |
Assets |  |
Total assets at fair value | 0 | 15
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 | $ 0 | $ 15

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