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Fair Value Measurements - Fair Value by Hierarchy (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023
Assets accounted for at fair value on a recurring basis |  |  |  |
Debt Securities, Available-for-sale | $ 42,793 | $ 42,793 |  | $ 39,818
Fixed maturities, at fair value using the fair value option ("FVO Securities") | 263 | 263 |  | 327
Equity securities, at fair value [1] | 634 | 634 |  | 864
Derivative assets | 31 | 31 |  | (1)
Short-term investments | 3,964 | 3,964 |  | 3,850
Total assets accounted for at fair value on a recurring basis | 47,685 | 47,685 |  | 44,858
Liabilities accounted for at fair value on a recurring basis |  |  |  |
Derivative liabilities | (19) | (19) |  | 8
Total liabilities accounted for at fair value on a recurring basis | (19) | $ (19) |  | 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. |  |
Credit derivatives |  |  |  |
Assets accounted for at fair value on a recurring basis |  |  |  |
Derivative assets | 30 | $ 30 |  | (10)
Liabilities accounted for at fair value on a recurring basis |  |  |  |
Derivative liabilities | (30) | (30) |  | 10
Interest rate derivatives |  |  |  |
Assets accounted for at fair value on a recurring basis |  |  |  |
Derivative assets | 1 | 1 |  |
Liabilities accounted for at fair value on a recurring basis |  |  |  |
Derivative liabilities | (6) | (6) |  | (6)
Equity |  |  |  |
Liabilities accounted for at fair value on a recurring basis |  |  |  |
Derivative liabilities | 5 | 5 |  |
Foreign exchange derivatives |  |  |  |
Assets accounted for at fair value on a recurring basis |  |  |  |
Derivative assets |  |  |  | 9
Liabilities accounted for at fair value on a recurring basis |  |  |  |
Derivative liabilities | 12 | 12 |  | 4
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 | 6 | 6 |  | 18
Fixed maturities, at fair value using the fair value option ("FVO Securities") | 0 | 0 |  | 0
Equity securities, at fair value [1] | 345 | 345 |  | 333
Derivative assets | 0 | 0 |  | 0
Short-term investments | 910 | 910 |  | 1,400
Total assets accounted for at fair value on a recurring basis | 1,261 | 1,261 |  | 1,751
Liabilities accounted for at fair value on a recurring basis |  |  |  |
Derivative liabilities | 0 | 0 |  | 0
Total liabilities accounted for at fair value on a recurring basis | 0 | 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 |  | 0
Liabilities accounted for at fair value on a recurring basis |  |  |  |
Derivative liabilities | 0 | 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 | 0 |  |
Liabilities accounted for at fair value on a recurring basis |  |  |  |
Derivative liabilities | 0 | 0 |  | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity |  |  |  |
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
Liabilities accounted for at fair value on a recurring basis |  |  |  |
Derivative liabilities | 0 | 0 |  | 0
Significant Observable Inputs (Level 2) |  |  |  |
Assets accounted for at fair value on a recurring basis |  |  |  |
Debt Securities, Available-for-sale | 39,972 | 39,972 |  | 37,563
Fixed maturities, at fair value using the fair value option ("FVO Securities") | 111 | 111 |  | 160
Equity securities, at fair value [1] | 212 | 212 |  | 473
Derivative assets | 31 | 31 |  | (1)
Short-term investments | 3,045 | 3,045 |  | 2,425
Total assets accounted for at fair value on a recurring basis | 43,371 | 43,371 |  | 40,620
Liabilities accounted for at fair value on a recurring basis |  |  |  |
Derivative liabilities | (24) | (24) |  | 8
Total liabilities accounted for at fair value on a recurring basis | (24) | (24) |  | 8
Significant Observable Inputs (Level 2) | Credit derivatives |  |  |  |
Assets accounted for at fair value on a recurring basis |  |  |  |
Derivative assets | 30 | 30 |  | (10)
Liabilities accounted for at fair value on a recurring basis |  |  |  |
Derivative liabilities | (30) | (30) |  | 10
Significant Observable Inputs (Level 2) | Interest rate derivatives |  |  |  |
Assets accounted for at fair value on a recurring basis |  |  |  |
Derivative assets | 1 | 1 |  |
Liabilities accounted for at fair value on a recurring basis |  |  |  |
Derivative liabilities | (6) | (6) |  | (6)
Significant Observable Inputs (Level 2) | Equity |  |  |  |
Liabilities accounted for at fair value on a recurring basis |  |  |  |
Derivative liabilities | 0 | 0 |  |
Significant Observable Inputs (Level 2) | Foreign exchange derivatives |  |  |  |
Assets accounted for at fair value on a recurring basis |  |  |  |
Derivative assets |  |  |  | 9
Liabilities accounted for at fair value on a recurring basis |  |  |  |
Derivative liabilities | 12 | 12 |  | 4
Significant Unobservable Inputs (Level 3) |  |  |  |
Assets accounted for at fair value on a recurring basis |  |  |  |
Debt Securities, Available-for-sale | 2,815 | 2,815 |  | 2,237
Fixed maturities, at fair value using the fair value option ("FVO Securities") | 152 | 152 |  | 167
Equity securities, at fair value [1] | 77 | 77 |  | 58
Derivative assets | 0 | 0 |  | 0
Short-term investments | 9 | 9 |  | 25
Total assets accounted for at fair value on a recurring basis | 3,053 | 3,053 |  | 2,487
Liabilities accounted for at fair value on a recurring basis |  |  |  |
Derivative liabilities | 5 | 5 |  | 0
Total liabilities accounted for at fair value on a recurring basis | 5 | 5 |  | 0
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] |  |  |  |
Liabilities accounted for at fair value on a recurring basis |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs | 5 | 5 | $ 0 | 0
Realized/unrealized gain/loss included in net income, liabilities | 0 | 0 |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss) | 0 | 0 |  |
Purchases | 5 | 5 |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements | 0 | 0 |  |
Sales | 0 | 0 |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers, Net | 0 | 0 |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers out of Level 3 | 0 | 0 |  |
Significant Unobservable Inputs (Level 3) | Credit derivatives |  |  |  |
Assets accounted for at fair value on a recurring basis |  |  |  |
Derivative assets | 0 | 0 |  | 0
Liabilities accounted for at fair value on a recurring basis |  |  |  |
Derivative liabilities | 0 | 0 |  | 0
Significant Unobservable Inputs (Level 3) | Interest rate 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 |  | 0
Significant Unobservable Inputs (Level 3) | Equity |  |  |  |
Liabilities accounted for at fair value on a recurring basis |  |  |  |
Derivative liabilities | 5 | 5 |  |
Significant Unobservable Inputs (Level 3) | Equity | Fair Value, Recurring [Member] |  |  |  |
Liabilities accounted for at fair value on a recurring basis |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs | 5 | 5 | $ 0 | 0
Realized/unrealized gain/loss included in net income, liabilities | 0 | 0 |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss) | 0 | 0 |  |
Purchases | 5 | 5 |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements | 0 | 0 |  |
Sales | 0 | 0 |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers, Net | 0 | 0 |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers out of Level 3 | 0 | 0 |  |
Significant Unobservable Inputs (Level 3) | Foreign exchange 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 |  | 0
Fair Value Measured at Net Asset Value Per Share [Member] |  |  |  |
Liabilities accounted for at fair value on a recurring basis |  |  |  |
Deposit Assets | 60 | 60 |  | 75
Asset-backed securities ("ABS") |  |  |  |
Assets accounted for at fair value on a recurring basis |  |  |  |
Debt Securities, Available-for-sale | 3,512 | 3,512 |  | 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 |  |  |  |
Debt Securities, Available-for-sale | 0 | 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 | 3,464 | 3,464 |  | 3,320
Asset-backed securities ("ABS") | Significant Unobservable Inputs (Level 3) |  |  |  |
Assets accounted for at fair value on a recurring basis |  |  |  |
Debt Securities, Available-for-sale | 48 | 48 |  | 0
Collateralized Loan Obligations [Member] |  |  |  |
Assets accounted for at fair value on a recurring basis |  |  |  |
Debt Securities, Available-for-sale | 3,563 | 3,563 |  | 3,090
Fixed maturities, at fair value using the fair value option ("FVO Securities") | 152 | 152 |  | 167
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 |  | 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 | 3,314 | 3,314 |  | 2,977
Collateralized Loan Obligations [Member] | Significant Unobservable Inputs (Level 3) |  |  |  |
Assets accounted for at fair value on a recurring basis |  |  |  |
Debt Securities, Available-for-sale | 249 | 249 |  | 113
Collateralized Loan Obligations [Member] | Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] |  |  |  |
Assets accounted for at fair value on a recurring basis |  |  |  |
Debt Securities, Available-for-sale | 79 | 79 |  | 98
CMBS |  |  |  |
Assets accounted for at fair value on a recurring basis |  |  |  |
Debt Securities, Available-for-sale | 2,857 | 2,857 |  | 3,125
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 |  | 0
CMBS | Significant Observable Inputs (Level 2) |  |  |  |
Assets accounted for at fair value on a recurring basis |  |  |  |
Debt Securities, Available-for-sale | 2,651 | 2,651 |  | 2,898
CMBS | Significant Unobservable Inputs (Level 3) |  |  |  |
Assets accounted for at fair value on a recurring basis |  |  |  |
Debt Securities, Available-for-sale | 206 | 206 |  | 227
CMBS | Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] |  |  |  |
Assets accounted for at fair value on a recurring basis |  |  |  |
Debt Securities, Available-for-sale | 204 | 204 |  | 226
Corporate |  |  |  |
Assets accounted for at fair value on a recurring basis |  |  |  |
Debt Securities, Available-for-sale | 20,558 | 20,558 |  | 17,866
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 |  | 0
Corporate | Significant Observable Inputs (Level 2) |  |  |  |
Assets accounted for at fair value on a recurring basis |  |  |  |
Debt Securities, Available-for-sale | 18,301 | 18,301 |  | 16,005
Corporate | Significant Unobservable Inputs (Level 3) |  |  |  |
Assets accounted for at fair value on a recurring basis |  |  |  |
Debt Securities, Available-for-sale | 2,257 | 2,257 |  | 1,861
Corporate | Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] |  |  |  |
Assets accounted for at fair value on a recurring basis |  |  |  |
Debt Securities, Available-for-sale | 2,141 | 2,141 |  | 1,741
Foreign government/government agencies |  |  |  |
Assets accounted for at fair value on a recurring basis |  |  |  |
Debt Securities, Available-for-sale | 541 | 541 |  | 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 |  |  |  |
Debt Securities, Available-for-sale | 0 | 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 | 541 | 541 |  | 562
Foreign government/government agencies | Significant Unobservable Inputs (Level 3) |  |  |  |
Assets accounted for at fair value on a recurring basis |  |  |  |
Debt Securities, Available-for-sale | 0 | 0 |  | 0
Municipal |  |  |  |
Assets accounted for at fair value on a recurring basis |  |  |  |
Debt Securities, Available-for-sale | 5,654 | 5,654 |  | 6,039
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 |  | 0
Municipal | Significant Observable Inputs (Level 2) |  |  |  |
Assets accounted for at fair value on a recurring basis |  |  |  |
Debt Securities, Available-for-sale | 5,654 | 5,654 |  | 6,039
Municipal | Significant Unobservable Inputs (Level 3) |  |  |  |
Assets accounted for at fair value on a recurring basis |  |  |  |
Debt Securities, Available-for-sale | 0 | 0 |  | 0
RMBS |  |  |  |
Assets accounted for at fair value on a recurring basis |  |  |  |
Debt Securities, Available-for-sale | 5,123 | 5,123 |  | 4,287
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 |  | 0
RMBS | Significant Observable Inputs (Level 2) |  |  |  |
Assets accounted for at fair value on a recurring basis |  |  |  |
Debt Securities, Available-for-sale | 5,068 | 5,068 |  | 4,251
RMBS | Significant Unobservable Inputs (Level 3) |  |  |  |
Assets accounted for at fair value on a recurring basis |  |  |  |
Debt Securities, Available-for-sale | 55 | 55 |  | 36
RMBS | Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] |  |  |  |
Assets accounted for at fair value on a recurring basis |  |  |  |
Debt Securities, Available-for-sale | 50 | 50 |  | 36
U.S. Treasuries |  |  |  |
Assets accounted for at fair value on a recurring basis |  |  |  |
Debt Securities, Available-for-sale | 985 | 985 |  | 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 |  |  |  |
Debt Securities, Available-for-sale | 6 | 6 |  | 18
U.S. Treasuries | Significant Observable Inputs (Level 2) |  |  |  |
Assets accounted for at fair value on a recurring basis |  |  |  |
Debt Securities, Available-for-sale | 979 | 979 |  | 1,511
U.S. Treasuries | Significant Unobservable Inputs (Level 3) |  |  |  |
Assets accounted for at fair value on a recurring basis |  |  |  |
Debt Securities, Available-for-sale | $ 0 | $ 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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