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Fair Value Measurements - Fair Value by Hierarchy (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | $ 37,497 | $ 36,231
Fixed maturities, at fair value using the fair value option ("FVO") | 320 | 333
Equity securities, at fair value | 895 | 1,801
Derivative assets | 6 | 34
Short-term investments | 3,236 | 3,859
Total assets accounted for at fair value on a recurring basis | 41,954 | 42,258
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | (41) | 13
Total liabilities accounted for at fair value on a recurring basis | (41) | 13
Credit derivatives |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets |  | 2
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | (71) | (2)
Foreign exchange derivatives |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets | 5 | 32
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | 33 | 21
Interest rate derivatives |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets | 1 |
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | (3) | (6)
Asset backed securities ("ABS") |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 2,685 | 1,941
Collateralized Loan Obligations [Member] |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 2,981 | 2,941
Fixed maturities, at fair value using the fair value option ("FVO") | 163 | 178
CMBS |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 3,227 | 3,368
Corporate |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 16,096 | 15,233
Foreign government/government agencies |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 539 | 547
Municipal |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 6,226 | 6,296
RMBS |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 3,729 | 3,708
U.S. Treasuries |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 2,014 | 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 | 0 | 0
Fixed maturities, at fair value using the fair value option ("FVO") | 0 | 0
Equity securities, at fair value | 357 | 1,261
Derivative assets | 0 | 0
Short-term investments | 1,749 | 1,429
Total assets accounted for at fair value on a recurring basis | 2,106 | 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
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 | 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 | 0 | 0
Significant Observable Inputs (Level 2) |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 35,483 | 34,180
Fixed maturities, at fair value using the fair value option ("FVO") | 157 | 155
Equity securities, at fair value | 479 | 479
Derivative assets | 6 | 34
Short-term investments | 1,301 | 2,237
Total assets accounted for at fair value on a recurring basis | 37,426 | 37,085
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | (41) | 13
Total liabilities accounted for at fair value on a recurring basis | (41) | 13
Significant Observable Inputs (Level 2) | Credit derivatives |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets |  | 2
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | (71) | (2)
Significant Observable Inputs (Level 2) | Foreign exchange derivatives |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets | 5 | 32
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | 33 | 21
Significant Observable Inputs (Level 2) | Interest rate derivatives |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets | 1 |
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | (3) | (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 | 2,685 | 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 | 2,896 | 2,826
Significant Observable Inputs (Level 2) | CMBS |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 2,989 | 3,146
Significant Observable Inputs (Level 2) | Corporate |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 14,474 | 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 | 539 | 547
Significant Observable Inputs (Level 2) | Municipal |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 6,226 | 6,296
Significant Observable Inputs (Level 2) | RMBS |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 3,660 | 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 | 2,014 | 2,197
Significant Unobservable Inputs (Level 3) |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 2,014 | 2,051
Fixed maturities, at fair value using the fair value option ("FVO") | 163 | 178
Equity securities, at fair value | 59 | 61
Derivative assets | 0 | 0
Short-term investments | 186 | 193
Total assets accounted for at fair value on a recurring basis | 2,422 | 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
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 | 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 | 0 | 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 | 85 | 115
Significant Unobservable Inputs (Level 3) | CMBS |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 238 | 222
Significant Unobservable Inputs (Level 3) | Corporate |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 1,622 | 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 | 69 | 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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