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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 | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Assets |  |
Total fixed income securities | $ 41,715 | $ 42,136
Equity securities | 4,723 | 7,061
Short-term investments | 4,030 | 4,009
Other investments | 1,798 | 2,656
Total assets at fair value | 50,659 | 53,318
Counterparty and cash collateral netting | $ (59) | $ (22)
% of total assets at fair value | (0.10%) | 0.00%
Total | $ 51,977 | $ 54,849
Liabilities |  |
% of total liabilities at fair value | 14.60% | (87.50%)
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 |  |
Total fixed income securities | $ 8,444 | $ 6,273
Municipal |  |
Assets |  |
Total fixed income securities | 6,029 | 6,393
Foreign government |  |
Assets |  |
Total fixed income securities | 890 | 985
ABS |  |
Assets |  |
Total fixed income securities | 1,620 | 1,155
Quoted prices in active markets for identical assets (Level 1) |  |
Assets |  |
Total assets at fair value | $ 13,458 | $ 13,700
% of total assets at fair value | 26.60% | 25.70%
Liabilities |  |
% of total liabilities at fair value | 18.70% | 37.50%
Significant other observable inputs (Level 2) |  |
Assets |  |
Total assets at fair value | $ 36,592 | $ 39,043
% of total assets at fair value | 72.20% | 73.20%
Liabilities |  |
% of total liabilities at fair value | 66.70% | 150.00%
Significant unobservable inputs (Level 3) |  |
Assets |  |
Total assets at fair value | $ 668 | $ 597
% of total assets at fair value | 1.30% | 1.10%
Liabilities |  |
% of total liabilities at fair value | 0.00% | 0.00%
Fair Value Net Asset Value |  |
Assets |  |
Investments reported at NAV | $ 1,318 | $ 1,531
Recurring basis |  |
Assets |  |
Total fixed income securities | 41,715 | 42,136
Equity securities | 4,723 | 7,061
Short-term investments | 4,030 | 4,009
Other investments | 50 | 14
Other investments | (59) | (22)
Other assets | 118 | 66
Total assets at fair value | 50,636 | 53,286
Counterparty and cash collateral netting | (59) | (22)
Liabilities |  |
Other liabilities | (48) | (8)
Other liabilities | (7) | 7
Total recurring basis liabilities | (48) | (8)
Counterparty and cash collateral netting | (7) | 7
Recurring basis | U.S. government and agencies |  |
Assets |  |
Total fixed income securities | 8,444 | 6,273
Recurring basis | Municipal |  |
Assets |  |
Total fixed income securities | 6,029 | 6,393
Recurring basis | Corporate - public |  |
Assets |  |
Total fixed income securities | 16,819 | 16,589
Recurring basis | Corporate - privately placed |  |
Assets |  |
Total fixed income securities | 7,913 | 10,741
Recurring basis | Foreign government |  |
Assets |  |
Total fixed income securities | 890 | 985
Recurring basis | ABS |  |
Assets |  |
Total fixed income securities | 1,620 | 1,155
Recurring basis | Quoted prices in active markets for identical assets (Level 1) |  |
Assets |  |
Total fixed income securities | 8,424 | 6,247
Equity securities | 4,092 | 6,312
Short-term investments | 928 | 1,140
Other investments | 0 | 0
Other assets | 14 | 1
Total assets at fair value | 13,458 | 13,700
Liabilities |  |
Other liabilities | (9) | (3)
Total recurring basis liabilities | (9) | (3)
Recurring basis | Quoted prices in active markets for identical assets (Level 1) | U.S. government and agencies |  |
Assets |  |
Total fixed income securities | 8,424 | 6,247
Recurring basis | Quoted prices in active markets for identical assets (Level 1) | Municipal |  |
Assets |  |
Total fixed income securities | 0 | 0
Recurring basis | Quoted prices in active markets for identical assets (Level 1) | Corporate - public |  |
Assets |  |
Total fixed income securities | 0 | 0
Recurring basis | Quoted prices in active markets for identical assets (Level 1) | Corporate - privately placed |  |
Assets |  |
Total fixed income securities | 0 | 0
Recurring basis | Quoted prices in active markets for identical assets (Level 1) | Foreign government |  |
Assets |  |
Total fixed income securities | 0 | 0
Recurring basis | Quoted prices in active markets for identical assets (Level 1) | ABS |  |
Assets |  |
Total fixed income securities | 0 | 0
Recurring basis | Significant other observable inputs (Level 2) |  |
Assets |  |
Total fixed income securities | 33,085 | 35,745
Equity securities | 304 | 400
Short-term investments | 3,096 | 2,864
Other investments | 107 | 34
Other assets | 0 | 0
Total assets at fair value | 36,592 | 39,043
Liabilities |  |
Other liabilities | (32) | (12)
Total recurring basis liabilities | (32) | (12)
Recurring basis | Significant other observable inputs (Level 2) | U.S. government and agencies |  |
Assets |  |
Total fixed income securities | 20 | 26
Recurring basis | Significant other observable inputs (Level 2) | Municipal |  |
Assets |  |
Total fixed income securities | 6,010 | 6,375
Recurring basis | Significant other observable inputs (Level 2) | Corporate - public |  |
Assets |  |
Total fixed income securities | 16,751 | 16,569
Recurring basis | Significant other observable inputs (Level 2) | Corporate - privately placed |  |
Assets |  |
Total fixed income securities | 7,842 | 10,675
Recurring basis | Significant other observable inputs (Level 2) | Foreign government |  |
Assets |  |
Total fixed income securities | 890 | 985
Recurring basis | Significant other observable inputs (Level 2) | ABS |  |
Assets |  |
Total fixed income securities | 1,572 | 1,115
Recurring basis | Significant unobservable inputs (Level 3) |  |
Assets |  |
Total fixed income securities | 206 | 144
Equity securities | 327 | 349
Short-term investments | 6 | 5
Other investments | 2 | 2
Other assets | 104 | 65
Total assets at fair value | 645 | 565
Liabilities |  |
Other liabilities | 0 | 0
Total recurring basis liabilities | 0 | 0
Recurring basis | Significant unobservable inputs (Level 3) | U.S. government and agencies |  |
Assets |  |
Total fixed income securities | 0 | 0
Recurring basis | Significant unobservable inputs (Level 3) | Municipal |  |
Assets |  |
Total fixed income securities | 19 | 18
Recurring basis | Significant unobservable inputs (Level 3) | Corporate - public |  |
Assets |  |
Total fixed income securities | 68 | 20
Recurring basis | Significant unobservable inputs (Level 3) | Corporate - privately placed |  |
Assets |  |
Total fixed income securities | 71 | 66
Recurring basis | Significant unobservable inputs (Level 3) | Foreign government |  |
Assets |  |
Total fixed income securities | 0 | 0
Recurring basis | Significant unobservable inputs (Level 3) | ABS |  |
Assets |  |
Total fixed income securities | 48 | 40
Non-recurring basis |  |
Assets |  |
Total assets at fair value | 23 | 32
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 | $ 23 | $ 32

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