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Fair Value of Assets and Liabilities - Schedule of Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Assets |  |
Fixed income securities | $ 46,771 | $ 42,485
Equity securities | 2,419 | 4,567
Short-term investments | 3,368 | 4,173
Other investments | 1,608 | 1,728
Total assets at fair value | 52,679 | 51,358
Counterparty and cash collateral netting | $ (16) | $ (22)
% of total assets at fair value | 0.00% | 0.00%
Total | $ 53,873 | $ 52,604
Liabilities |  |
% of total liabilities at fair value | (44.40%) | (420.00%)
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 | $ 8,245 | $ 7,898
Municipal |  |
Assets |  |
Fixed income securities | 6,584 | 6,210
Foreign government |  |
Assets |  |
Fixed income securities | 1,135 | 957
ABS |  |
Assets |  |
Fixed income securities | 1,101 | 1,157
Quoted prices in active markets for identical assets (Level 1) |  |
Assets |  |
Total assets at fair value | $ 11,604 | $ 12,325
% of total assets at fair value | 22.00% | 24.00%
Liabilities |  |
% of total liabilities at fair value | 33.30% | 20.00%
Significant other observable inputs (Level 2) |  |
Assets |  |
Total assets at fair value | $ 40,444 | $ 38,414
% of total assets at fair value | 76.80% | 74.80%
Liabilities |  |
% of total liabilities at fair value | 111.10% | 500.00%
Significant unobservable inputs (Level 3) |  |
Assets |  |
Total assets at fair value | $ 647 | $ 641
% 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 | $ 1,194 | $ 1,246
Recurring basis |  |
Assets |  |
Fixed income securities | 46,771 | 42,485
Equity securities | 2,419 | 4,567
Short-term investments | 3,368 | 4,173
Other investments | 6 | 4
Other investments | (16) | (22)
Other assets | 115 | 106
Total assets at fair value | 52,679 | 51,335
Counterparty and cash collateral netting | (16) | (22)
Liabilities |  |
Other liabilities | (9) | (5)
Other liabilities | 4 | 21
Total recurring basis liabilities | (9) | (5)
Counterparty and cash collateral netting | 4 | 21
Recurring basis | U.S. government and agencies |  |
Assets |  |
Fixed income securities | 8,245 | 7,898
Recurring basis | Municipal |  |
Assets |  |
Fixed income securities | 6,584 | 6,210
Recurring basis | Corporate - public |  |
Assets |  |
Fixed income securities | 22,059 | 18,616
Recurring basis | Corporate - privately placed |  |
Assets |  |
Fixed income securities | 7,647 | 7,647
Recurring basis | Foreign government |  |
Assets |  |
Fixed income securities | 1,135 | 957
Recurring basis | ABS |  |
Assets |  |
Fixed income securities | 1,101 | 1,157
Recurring basis | Quoted prices in active markets for identical assets (Level 1) |  |
Assets |  |
Fixed income securities | 8,232 | 7,878
Equity securities | 1,892 | 3,936
Short-term investments | 1,478 | 508
Other investments | 0 | 0
Other assets | 2 | 3
Total assets at fair value | 11,604 | 12,325
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 | 8,232 | 7,878
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 | Significant other observable inputs (Level 2) |  |
Assets |  |
Fixed income securities | 38,406 | 34,434
Equity securities | 144 | 298
Short-term investments | 1,874 | 3,659
Other investments | 20 | 23
Other assets | 0 | 0
Total assets at fair value | 40,444 | 38,414
Liabilities |  |
Other liabilities | (10) | (25)
Total recurring basis liabilities | (10) | (25)
Recurring basis | Significant other observable inputs (Level 2) | U.S. government and agencies |  |
Assets |  |
Fixed income securities | 13 | 20
Recurring basis | Significant other observable inputs (Level 2) | Municipal |  |
Assets |  |
Fixed income securities | 6,573 | 6,189
Recurring basis | Significant other observable inputs (Level 2) | Corporate - public |  |
Assets |  |
Fixed income securities | 22,034 | 18,547
Recurring basis | Significant other observable inputs (Level 2) | Corporate - privately placed |  |
Assets |  |
Fixed income securities | 7,588 | 7,592
Recurring basis | Significant other observable inputs (Level 2) | Foreign government |  |
Assets |  |
Fixed income securities | 1,135 | 957
Recurring basis | Significant other observable inputs (Level 2) | ABS |  |
Assets |  |
Fixed income securities | 1,063 | 1,129
Recurring basis | Significant unobservable inputs (Level 3) |  |
Assets |  |
Fixed income securities | 133 | 173
Equity securities | 383 | 333
Short-term investments | 16 | 6
Other investments | 2 | 3
Other assets | 113 | 103
Total assets at fair value | 647 | 618
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 | 0 | 0
Recurring basis | Significant unobservable inputs (Level 3) | Municipal |  |
Assets |  |
Fixed income securities | 11 | 21
Recurring basis | Significant unobservable inputs (Level 3) | Corporate - public |  |
Assets |  |
Fixed income securities | 25 | 69
Recurring basis | Significant unobservable inputs (Level 3) | Corporate - privately placed |  |
Assets |  |
Fixed income securities | 59 | 55
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 | 38 | 28
Non-recurring basis |  |
Assets |  |
Total assets at fair value | 0 | 23
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 | $ 23

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