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Fair Value of Assets and Liabilities - Assets and liabilities measured at fair value on a recurring and non-recurring basis (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Assets |  |
Fixed income securities | $ 45,550 | $ 42,485
Equity securities | 2,290 | 4,567
Short-term investments | 5,137 | 4,173
Other investments | 1,718 | 1,728
Total assets at fair value | 53,087 | 51,358
Counterparty and cash collateral netting | $ (10) | $ (22)
% of total assets at fair value | 0.00% | 0.00%
Total | $ 54,315 | $ 52,604
Liabilities |  |
% of total liabilities at fair value | (200.00%) | (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 | $ 7,729 | $ 7,898
Municipal |  |
Assets |  |
Fixed income securities | 6,840 | 6,210
Foreign government |  |
Assets |  |
Fixed income securities | 1,044 | 957
ABS |  |
Assets |  |
Fixed income securities | 983 | 1,157
Quoted prices in active markets for identical assets (Level 1) |  |
Assets |  |
Total assets at fair value | $ 10,650 | $ 12,325
% of total assets at fair value | 20.00% | 24.00%
Liabilities |  |
% of total liabilities at fair value | 66.70% | 20.00%
Significant other observable inputs (Level 2) |  |
Assets |  |
Total assets at fair value | $ 41,820 | $ 38,414
% of total assets at fair value | 78.80% | 74.80%
Liabilities |  |
% of total liabilities at fair value | 233.30% | 500.00%
Significant unobservable inputs (Level 3) |  |
Assets |  |
Total assets at fair value | $ 627 | $ 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 | $ 1,228 | $ 1,246
Recurring basis |  |
Assets |  |
Fixed income securities | 45,550 | 42,485
Equity securities | 2,290 | 4,567
Short-term investments | 5,137 | 4,173
Other investments | 2 | 4
Other investments | (10) | (22)
Other assets | 106 | 106
Total assets at fair value | 53,085 | 51,335
Counterparty and cash collateral netting | (10) | (22)
Liabilities |  |
Other liabilities | (9) | (5)
Other liabilities | 18 | 21
Total recurring basis liabilities | (9) | (5)
Counterparty and cash collateral netting | 18 | 21
Recurring basis | U.S. government and agencies |  |
Assets |  |
Fixed income securities | 7,729 | 7,898
Recurring basis | Municipal |  |
Assets |  |
Fixed income securities | 6,840 | 6,210
Recurring basis | Corporate - public |  |
Assets |  |
Fixed income securities | 21,239 | 18,616
Recurring basis | Corporate - privately placed |  |
Assets |  |
Fixed income securities | 7,715 | 7,647
Recurring basis | Foreign government |  |
Assets |  |
Fixed income securities | 1,044 | 957
Recurring basis | ABS |  |
Assets |  |
Fixed income securities | 983 | 1,157
Recurring basis | Quoted prices in active markets for identical assets (Level 1) |  |
Assets |  |
Fixed income securities | 7,716 | 7,878
Equity securities | 1,777 | 3,936
Short-term investments | 1,155 | 508
Other investments | 0 | 0
Other assets | 2 | 3
Total assets at fair value | 10,650 | 12,325
Liabilities |  |
Other liabilities | (6) | (1)
Total recurring basis liabilities | (6) | (1)
Recurring basis | Quoted prices in active markets for identical assets (Level 1) | U.S. government and agencies |  |
Assets |  |
Fixed income securities | 7,716 | 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 | 37,702 | 34,434
Equity securities | 132 | 298
Short-term investments | 3,976 | 3,659
Other investments | 10 | 23
Other assets | 0 | 0
Total assets at fair value | 41,820 | 38,414
Liabilities |  |
Other liabilities | (21) | (25)
Total recurring basis liabilities | (21) | (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 | 6,828 | 6,189
Recurring basis | Significant other observable inputs (Level 2) | Corporate - public |  |
Assets |  |
Fixed income securities | 21,213 | 18,547
Recurring basis | Significant other observable inputs (Level 2) | Corporate - privately placed |  |
Assets |  |
Fixed income securities | 7,655 | 7,592
Recurring basis | Significant other observable inputs (Level 2) | Foreign government |  |
Assets |  |
Fixed income securities | 1,044 | 957
Recurring basis | Significant other observable inputs (Level 2) | ABS |  |
Assets |  |
Fixed income securities | 949 | 1,129
Recurring basis | Significant unobservable inputs (Level 3) |  |
Assets |  |
Fixed income securities | 132 | 173
Equity securities | 381 | 333
Short-term investments | 6 | 6
Other investments | 2 | 3
Other assets | 104 | 103
Total assets at fair value | 625 | 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 | 12 | 21
Recurring basis | Significant unobservable inputs (Level 3) | Corporate - public |  |
Assets |  |
Fixed income securities | 26 | 69
Recurring basis | Significant unobservable inputs (Level 3) | Corporate - privately placed |  |
Assets |  |
Fixed income securities | 60 | 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 | 34 | 28
Non-recurring basis |  |
Assets |  |
Total assets at fair value | 2 | 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 | $ 2 | $ 23

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