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Fair Value Measurements - Fair Value by Hierarchy (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | $ 37,962 | $ 36,231
Fixed maturities, at fair value using the fair value option ("FVO") | 332 | 333
Equity securities, at fair value | 878 | 1,801
Derivative assets | (45) | 34
Short-term investments | 3,300 | 3,859
Total assets accounted for at fair value on a recurring basis | 42,427 | 42,258
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | 30 | 13
Total liabilities accounted for at fair value on a recurring basis | 30 | 13
Credit derivatives |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets | (58) | 2
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | (1) | (2)
Foreign exchange derivatives |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets | 9 | 32
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | 31 | 21
Interest rate derivatives |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets | 4 |
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities |  | (6)
Asset backed securities ("ABS") |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 3,130 | 1,941
Collateralized Loan Obligations [Member] |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 3,043 | 2,941
Fixed maturities, at fair value using the fair value option ("FVO") | 173 | 178
CMBS |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 3,124 | 3,368
Corporate |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 16,651 | 15,233
Foreign government/government agencies |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 567 | 547
Municipal |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 5,686 | 6,296
RMBS |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 3,827 | 3,708
U.S. Treasuries |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 1,934 | 2,197
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 49 | 0
Fixed maturities, at fair value using the fair value option ("FVO") | 0 | 0
Equity securities, at fair value | 356 | 1,261
Derivative assets | 0 | 0
Short-term investments | 1,187 | 1,429
Total assets accounted for at fair value on a recurring basis | 1,592 | 2,690
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | 0 | 0
Total liabilities accounted for at fair value on a recurring basis | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Credit derivatives |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets | 0 | 0
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Foreign exchange derivatives |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets | 0 | 0
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Interest rate derivatives |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets | 0 |
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities |  | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Asset backed securities ("ABS") |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Collateralized Loan Obligations [Member] |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | CMBS |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Foreign government/government agencies |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Municipal |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | RMBS |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Treasuries |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 49 | 0
Significant Observable Inputs (Level 2) |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 35,825 | 34,180
Fixed maturities, at fair value using the fair value option ("FVO") | 159 | 155
Equity securities, at fair value | 464 | 479
Derivative assets | (45) | 34
Short-term investments | 1,928 | 2,237
Total assets accounted for at fair value on a recurring basis | 38,331 | 37,085
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | 30 | 13
Total liabilities accounted for at fair value on a recurring basis | 30 | 13
Significant Observable Inputs (Level 2) | Credit derivatives |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets | (58) | 2
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | (1) | (2)
Significant Observable Inputs (Level 2) | Foreign exchange derivatives |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets | 9 | 32
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | 31 | 21
Significant Observable Inputs (Level 2) | Interest rate derivatives |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets | 4 |
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities |  | (6)
Significant Observable Inputs (Level 2) | Asset backed securities ("ABS") |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 3,084 | 1,911
Significant Observable Inputs (Level 2) | Collateralized Loan Obligations [Member] |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 2,946 | 2,826
Significant Observable Inputs (Level 2) | CMBS |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 2,898 | 3,146
Significant Observable Inputs (Level 2) | Corporate |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 14,996 | 13,644
Significant Observable Inputs (Level 2) | Foreign government/government agencies |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 567 | 547
Significant Observable Inputs (Level 2) | Municipal |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 5,686 | 6,296
Significant Observable Inputs (Level 2) | RMBS |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 3,763 | 3,613
Significant Observable Inputs (Level 2) | U.S. Treasuries |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 1,885 | 2,197
Significant Unobservable Inputs (Level 3) |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 2,088 | 2,051
Fixed maturities, at fair value using the fair value option ("FVO") | 173 | 178
Equity securities, at fair value | 58 | 61
Derivative assets | 0 | 0
Short-term investments | 185 | 193
Total assets accounted for at fair value on a recurring basis | 2,504 | 2,483
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | 0 | 0
Total liabilities accounted for at fair value on a recurring basis | 0 | 0
Significant Unobservable Inputs (Level 3) | Credit derivatives |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets | 0 | 0
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | 0 | 0
Significant Unobservable Inputs (Level 3) | Foreign exchange derivatives |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets | 0 | 0
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | 0 | 0
Significant Unobservable Inputs (Level 3) | Interest rate derivatives |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets | 0 |
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities |  | 0
Significant Unobservable Inputs (Level 3) | Asset backed securities ("ABS") |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 46 | 30
Significant Unobservable Inputs (Level 3) | Collateralized Loan Obligations [Member] |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 97 | 115
Significant Unobservable Inputs (Level 3) | CMBS |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 226 | 222
Significant Unobservable Inputs (Level 3) | Corporate |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 1,655 | 1,589
Significant Unobservable Inputs (Level 3) | Foreign government/government agencies |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 0 | 0
Significant Unobservable Inputs (Level 3) | Municipal |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 0 | 0
Significant Unobservable Inputs (Level 3) | RMBS |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 64 | 95
Significant Unobservable Inputs (Level 3) | U.S. Treasuries |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | $ 0 | $ 0

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