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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 | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Assets |  |
Fixed income securities, at fair value | $ 40,594 | $ 42,565
Equity securities, at fair value | 3,154 | 3,168
Short-term investments, at fair value | 6,017 | 6,807
Other investments | 3,042 | 1,691
Assets held for sale | 36,829 | 42,131
Assets held for sale | (7) | (6)
Counterparty and cash collateral netting | $ (24) | $ (15)
Assets as a percent of assets measured at fair value | 0.00% | 0.00%
Total | $ 83,578 | $ 84,237
Liabilities |  |
Liabilities held for sale | (33,383) | (33,325)
Counterparty and cash collateral netting | 17 | 27
Liabilities held for sale counterparty and cash collateral netting | $ 4 | $ 9
Liabilities as a percent of liabilities measured at fair value | (3.00%) | (4.20%)
U.S. government and agencies |  |
Assets |  |
Fixed income securities, at fair value | $ 3,110 | $ 2,107
Municipal |  |
Assets |  |
Fixed income securities, at fair value | 7,500 | 7,578
Foreign government |  |
Assets |  |
Fixed income securities, at fair value | 985 | 958
ABS |  |
Assets |  |
Fixed income securities, at fair value | 943 | 846
MBS |  |
Assets |  |
Fixed income securities, at fair value | 53 | 59
Quoted prices in active markets for identical assets (Level 1) |  |
Assets |  |
Total assets at fair value | $ 15,303 | $ 17,567
Assets as a percent of assets measured at fair value | 18.70% | 21.30%
Liabilities |  |
Total recurring basis liabilities | $ (1) | $ 0
Liabilities as a percent of liabilities measured at fair value | 0.20% | 0.00%
Significant other observable inputs (Level 2) |  |
Assets |  |
Total assets at fair value | $ 65,523 | $ 64,029
Assets as a percent of assets measured at fair value | 80.30% | 77.70%
Liabilities |  |
Total recurring basis liabilities | $ (118) | $ (153)
Liabilities as a percent of liabilities measured at fair value | 20.90% | 23.80%
Significant unobservable inputs (Level 3) |  |
Assets |  |
Total assets at fair value | $ 851 | $ 832
Assets as a percent of assets measured at fair value | 1.00% | 1.00%
Liabilities |  |
Total recurring basis liabilities | $ (463) | $ (516)
Liabilities as a percent of liabilities measured at fair value | 81.90% | 80.40%
Fair Value Net Asset Value |  |
Assets |  |
Assets held for sale | $ 562 | $ 762
Investments reported at NAV | 1,363 | 1,062
Recurring basis |  |
Assets |  |
Other investments | (17) | (9)
Liabilities |  |
Other liabilities | 13 | 18
Counterparty and cash collateral netting | 17 | 27
Recurring basis | Quoted prices in active markets for identical assets (Level 1) |  |
Assets |  |
Fixed income securities, at fair value | 3,074 | 2,061
Equity securities, at fair value | 2,318 | 2,468
Short-term investments, at fair value | 3,530 | 6,549
Other investments | 0 | 0
Other assets | 1 | 1
Assets held for sale | 6,380 | 6,488
Total assets at fair value | 15,303 | 17,567
Liabilities |  |
Other liabilities | (1) | 0
Liabilities held for sale | 0 | 0
Total recurring basis liabilities | (1) | 0
Recurring basis | Quoted prices in active markets for identical assets (Level 1) | U.S. government and agencies |  |
Assets |  |
Fixed income securities, at fair value | 3,074 | 2,061
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 | 37,252 | 40,278
Equity securities, at fair value | 426 | 396
Short-term investments, at fair value | 2,487 | 223
Other investments | 39 | 29
Other assets | 0 | 0
Assets held for sale | 25,319 | 23,103
Total assets at fair value | 65,523 | 64,029
Liabilities |  |
Other liabilities | (21) | (34)
Liabilities held for sale | (97) | (119)
Total recurring basis liabilities | (118) | (153)
Recurring basis | Significant other observable inputs (Level 2) | U.S. government and agencies |  |
Assets |  |
Fixed income securities, at fair value | 36 | 45
Recurring basis | Significant other observable inputs (Level 2) | Municipal |  |
Assets |  |
Fixed income securities, at fair value | 7,482 | 7,562
Recurring basis | Significant other observable inputs (Level 2) | Corporate - public |  |
Assets |  |
Fixed income securities, at fair value | 18,818 | 21,885
Recurring basis | Significant other observable inputs (Level 2) | Corporate - privately placed |  |
Assets |  |
Fixed income securities, at fair value | 9,037 | 9,002
Recurring basis | Significant other observable inputs (Level 2) | Foreign government |  |
Assets |  |
Fixed income securities, at fair value | 985 | 958
Recurring basis | Significant other observable inputs (Level 2) | ABS |  |
Assets |  |
Fixed income securities, at fair value | 864 | 794
Recurring basis | Significant other observable inputs (Level 2) | MBS |  |
Assets |  |
Fixed income securities, at fair value | 30 | 32
Recurring basis | Significant unobservable inputs (Level 3) |  |
Assets |  |
Fixed income securities, at fair value | 268 | 226
Equity securities, at fair value | 410 | 304
Short-term investments, at fair value | 0 | 35
Other investments | 3 | 0
Other assets | 0 | 0
Assets held for sale | 170 | 267
Total assets at fair value | 851 | 832
Liabilities |  |
Other liabilities | 0 | 0
Liabilities held for sale | (463) | (516)
Total recurring basis liabilities | (463) | (516)
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 | 18 | 17
Recurring basis | Significant unobservable inputs (Level 3) | Corporate - public |  |
Assets |  |
Fixed income securities, at fair value | 43 | 67
Recurring basis | Significant unobservable inputs (Level 3) | Corporate - privately placed |  |
Assets |  |
Fixed income securities, at fair value | 105 | 63
Recurring basis | Significant unobservable inputs (Level 3) | Foreign government |  |
Assets |  |
Fixed income securities, at fair value |  | 0
Fair value |  |
Assets |  |
Total assets at fair value | $ 81,653 | $ 82,413
Assets as a percent of assets measured at fair value | 100.00% | 100.00%
Liabilities |  |
Total recurring basis liabilities | $ (565) | $ (642)
Liabilities as a percent of liabilities measured at fair value | 100.00% | 100.00%
Fair value | Significant unobservable inputs (Level 3) |  |
Assets |  |
Assets held for sale | $ 3,484 | $ 4,440
Liabilities |  |
Liabilities held for sale | (8,950) | (9,424)
Fair value | Recurring basis |  |
Assets |  |
Fixed income securities, at fair value | 40,594 | 42,565
Equity securities, at fair value | 3,154 | 3,168
Short-term investments, at fair value | 6,017 | 6,807
Other investments | 25 | 20
Other assets | 1 | 1
Assets held for sale | 31,862 | 29,852
Total assets at fair value | 81,653 | 82,413
Liabilities |  |
Other liabilities | (9) | (16)
Liabilities held for sale | (556) | (626)
Total recurring basis liabilities | (565) | (642)
Fair value | Recurring basis | U.S. government and agencies |  |
Assets |  |
Fixed income securities, at fair value | 3,110 | 2,106
Fair value | Recurring basis | Municipal |  |
Assets |  |
Fixed income securities, at fair value | 7,500 | 7,579
Fair value | Recurring basis | Corporate - public |  |
Assets |  |
Fixed income securities, at fair value | 18,861 | 21,952
Fair value | Recurring basis | Corporate - privately placed |  |
Assets |  |
Fixed income securities, at fair value | 9,142 | 9,065
Fair value | Recurring basis | Foreign government |  |
Assets |  |
Fixed income securities, at fair value | 985 | 958
Fair value | Recurring basis | ABS |  |
Assets |  |
Fixed income securities, at fair value | 943 | 846
Fair value | Recurring basis | MBS |  |
Assets |  |
Fixed income securities, at fair value | 53 | 59
Fair value | Recurring basis | Significant unobservable inputs (Level 3) | Foreign government |  |
Assets |  |
Fixed income securities, at fair value | 0 |
Fair value | Recurring basis | Significant unobservable inputs (Level 3) | ABS |  |
Assets |  |
Fixed income securities, at fair value | 79 | 52
Fair value | Recurring basis | Significant unobservable inputs (Level 3) | MBS |  |
Assets |  |
Fixed income securities, at fair value | $ 23 | $ 27

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