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Fair Value Measurements - Fair Value by Hierarchy (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2025 | Dec. 31, 2024
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | $ 44,558 | $ 42,567
Fixed maturities, at fair value using the fair value option ("FVO Securities") | 181 | 308
Equity securities, at fair value [1] | 529 | 603
Derivative assets | 35 | 57
Short-term investments | 3,649 | 4,068
Total assets accounted for at fair value on a recurring basis | 48,952 | 47,603
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | (43) | (12)
Total liabilities accounted for at fair value on a recurring basis | $ (43) | $ (12)
Equity Security, FV-NI, Contractual Sale Restriction, Nature of Restriction and Circumstance for Lapse | Level 3 includes investments that have contractual sales restrictions that require consent to sell and are in place for the duration that the securities are held by the Company. | Level 3 includes investments that have contractual sales restrictions that require consent to sell and are in place for the duration that the securities are held by the Company.
Credit derivatives |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets | $ 27 | $ 30
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | (27) | (30)
Foreign exchange derivatives |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets | 3 | 23
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | (15) | 18
Equity |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets | 5 | 4
Interest rate derivatives |  |
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | (1) |
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 | 115 | 57
Fixed maturities, at fair value using the fair value option ("FVO Securities") | 0 | 0
Equity securities, at fair value [1] | 390 | 372
Derivative assets | 0 | 0
Short-term investments | 604 | 1,271
Total assets accounted for at fair value on a recurring basis | 1,109 | 1,700
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) | Equity |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Interest rate derivatives |  |
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | 0 |
Significant Observable Inputs (Level 2) |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 41,398 | 39,900
Fixed maturities, at fair value using the fair value option ("FVO Securities") | 0 | 111
Equity securities, at fair value [1] | 46 | 144
Derivative assets | 35 | 57
Short-term investments | 2,929 | 2,699
Total assets accounted for at fair value on a recurring basis | 44,408 | 42,911
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | (43) | (12)
Total liabilities accounted for at fair value on a recurring basis | (43) | (12)
Significant Observable Inputs (Level 2) | Credit derivatives |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets | 27 | 30
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | (27) | (30)
Significant Observable Inputs (Level 2) | Foreign exchange derivatives |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets | 3 | 23
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | (15) | 18
Significant Observable Inputs (Level 2) | Equity |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets | 5 | 4
Significant Observable Inputs (Level 2) | Interest rate derivatives |  |
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | (1) |
Fair Value, Inputs, Level 3 [Member] |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 3,045 | 2,610
Fixed maturities, at fair value using the fair value option ("FVO Securities") | 181 | 197
Equity securities, at fair value [1] | 93 | 87
Derivative assets | 0 | 0
Short-term investments | 116 | 98
Total assets accounted for at fair value on a recurring basis | 3,435 | 2,992
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
Fair Value, Inputs, Level 3 [Member] | 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
Fair Value, Inputs, Level 3 [Member] | 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
Fair Value, Inputs, Level 3 [Member] | Equity |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Interest rate derivatives |  |
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | 0 |
Fair Value Measured at Net Asset Value Per Share [Member] |  |
Liabilities accounted for at fair value on a recurring basis |  |
Deposit Assets | 71 | 61
Asset-backed securities ("ABS") |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 4,376 | 3,937
Asset-backed securities ("ABS") | 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
Asset-backed securities ("ABS") | Significant Observable Inputs (Level 2) |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 4,284 | 3,915
Asset-backed securities ("ABS") | Fair Value, Inputs, Level 3 [Member] |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 92 | 22
Collateralized Loan Obligations [Member] |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 3,393 | 3,250
Fixed maturities, at fair value using the fair value option ("FVO Securities") | 181 | 308
Collateralized Loan Obligations [Member] | 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
Collateralized Loan Obligations [Member] | Significant Observable Inputs (Level 2) |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 3,323 | 3,134
Collateralized Loan Obligations [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 70 | 116
CMBS |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 2,585 | 2,736
CMBS | 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
CMBS | Significant Observable Inputs (Level 2) |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 2,448 | 2,569
CMBS | Fair Value, Inputs, Level 3 [Member] |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 137 | 167
Corporate |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 22,525 | 20,636
Corporate | 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
Corporate | Significant Observable Inputs (Level 2) |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 19,791 | 18,355
Corporate | Fair Value, Inputs, Level 3 [Member] |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 2,734 | 2,281
Foreign government/government agencies |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 455 | 480
Foreign government/government agencies | 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
Foreign government/government agencies | Significant Observable Inputs (Level 2) |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 455 | 480
Foreign government/government agencies | Fair Value, Inputs, Level 3 [Member] |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 0 | 0
Municipal |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 4,650 | 5,304
Municipal | 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
Municipal | Significant Observable Inputs (Level 2) |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 4,650 | 5,304
Municipal | Fair Value, Inputs, Level 3 [Member] |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 0 | 0
RMBS |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 5,513 | 5,230
RMBS | 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
RMBS | Significant Observable Inputs (Level 2) |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 5,501 | 5,206
RMBS | Fair Value, Inputs, Level 3 [Member] |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 12 | 24
U.S. Treasuries |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 1,061 | 994
U.S. Treasuries | 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 | 115 | 57
U.S. Treasuries | Significant Observable Inputs (Level 2) |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 946 | 937
U.S. Treasuries | Fair Value, Inputs, Level 3 [Member] |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | $ 0 | $ 0

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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. 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