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Fair Value Measurements - Fair Value by Hierarchy (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities, AFS | $ 42,567 | $ 39,818
Fixed maturities, at fair value using the fair value option ("FVO Securities") | 308 | 327
Equity securities, at fair value | 603 | 864
Derivative assets | 57 | (1)
Short-term investments | 4,068 | 3,850
Total assets accounted for at fair value on a recurring basis | 47,603 | 44,858
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | (12) | 8
Total liabilities accounted for at fair value on a recurring basis | $ (12) | $ 8
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 | $ 30 | $ (10)
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | (30) | 10
Foreign exchange derivatives |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets | 23 | 9
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | 18 | 4
Interest rate derivatives |  |
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities |  | (6)
Equity derivatives |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets | 4 |
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities, AFS | 57 | 18
Fixed maturities, at fair value using the fair value option ("FVO Securities") | 0 | 0
Equity securities, at fair value | 372 | 333
Derivative assets | 0 | 0
Short-term investments | 1,271 | 1,400
Total assets accounted for at fair value on a recurring basis | 1,700 | 1,751
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 |  |
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities |  | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity derivatives |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets | 0 |
Significant Observable Inputs (Level 2) |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities, AFS | 39,900 | 37,563
Fixed maturities, at fair value using the fair value option ("FVO Securities") | 111 | 160
Equity securities, at fair value | 144 | 473
Derivative assets | 57 | (1)
Short-term investments | 2,699 | 2,425
Total assets accounted for at fair value on a recurring basis | 42,911 | 40,620
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | (12) | 8
Total liabilities accounted for at fair value on a recurring basis | (12) | 8
Significant Observable Inputs (Level 2) | Credit derivatives |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets | 30 | (10)
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | (30) | 10
Significant Observable Inputs (Level 2) | Foreign exchange derivatives |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets | 23 | 9
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | 18 | 4
Significant Observable Inputs (Level 2) | Interest rate derivatives |  |
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities |  | (6)
Significant Observable Inputs (Level 2) | Equity derivatives |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets | 4 |
Significant Unobservable Inputs (Level 3) |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities, AFS | 2,610 | 2,237
Fixed maturities, at fair value using the fair value option ("FVO Securities") | 197 | 167
Equity securities, at fair value | 87 | 58
Derivative assets | 0 | 0
Short-term investments | 98 | 25
Total assets accounted for at fair value on a recurring basis | 2,992 | 2,487
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 |  |
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities |  | 0
Significant Unobservable Inputs (Level 3) | Equity derivatives |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets | 0 |
Fair Value Measured at Net Asset Value Per Share [Member] |  |
Liabilities accounted for at fair value on a recurring basis |  |
Deposit Assets | 61 | 75
Asset-backed securities ("ABS") |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities, AFS | 3,937 | 3,320
Asset-backed securities ("ABS") | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities, AFS | 0 | 0
Asset-backed securities ("ABS") | Significant Observable Inputs (Level 2) |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities, AFS | 3,915 | 3,320
Asset-backed securities ("ABS") | Significant Unobservable Inputs (Level 3) |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities, AFS | 22 | 0
Collateralized Loan Obligations [Member] |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities, AFS | 3,250 | 3,090
Fixed maturities, at fair value using the fair value option ("FVO Securities") |  | 327
Collateralized Loan Obligations [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities, AFS | 0 | 0
Collateralized Loan Obligations [Member] | Significant Observable Inputs (Level 2) |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities, AFS | 3,134 | 2,977
Collateralized Loan Obligations [Member] | Significant Unobservable Inputs (Level 3) |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities, AFS | 116 | 113
Commercial mortgage-backed securities ("CMBS") |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities, AFS | 2,736 | 3,125
Commercial mortgage-backed securities ("CMBS") | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities, AFS | 0 | 0
Commercial mortgage-backed securities ("CMBS") | Significant Observable Inputs (Level 2) |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities, AFS | 2,569 | 2,898
Commercial mortgage-backed securities ("CMBS") | Significant Unobservable Inputs (Level 3) |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities, AFS | 167 | 227
Corporate |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities, AFS | 20,636 | 17,866
Corporate | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities, AFS | 0 | 0
Corporate | Significant Observable Inputs (Level 2) |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities, AFS | 18,355 | 16,005
Corporate | Significant Unobservable Inputs (Level 3) |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities, AFS | 2,281 | 1,861
Foreign government/government agencies |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities, AFS | 480 | 562
Foreign government/government agencies | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities, AFS | 0 | 0
Foreign government/government agencies | Significant Observable Inputs (Level 2) |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities, AFS | 480 | 562
Foreign government/government agencies | Significant Unobservable Inputs (Level 3) |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities, AFS | 0 | 0
Municipal |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities, AFS | 5,304 | 6,039
Municipal | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities, AFS | 0 | 0
Municipal | Significant Observable Inputs (Level 2) |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities, AFS | 5,304 | 6,039
Municipal | Significant Unobservable Inputs (Level 3) |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities, AFS | 0 | 0
Residential mortgage-backed securities ("RMBS") |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities, AFS | 5,230 | 4,287
Residential mortgage-backed securities ("RMBS") | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities, AFS | 0 | 0
Residential mortgage-backed securities ("RMBS") | Significant Observable Inputs (Level 2) |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities, AFS | 5,206 | 4,251
Residential mortgage-backed securities ("RMBS") | Significant Unobservable Inputs (Level 3) |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities, AFS | 24 | 36
U.S. Treasuries |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities, AFS | 994 | 1,529
U.S. Treasuries | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities, AFS | 57 | 18
U.S. Treasuries | Significant Observable Inputs (Level 2) |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities, AFS | 937 | 1,511
U.S. Treasuries | Significant Unobservable Inputs (Level 3) |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities, AFS | $ 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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