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Fair Value Measurements - Fair Value by Hierarchy (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | $ 43,942 | $ 45,035
Equity securities, at fair value | 1,616 | 1,438
Derivative assets | 2 | 23
Fixed maturities, at fair value using the fair value option | 75 | 0
Short-term investments | 3,612 | 3,283
Total assets accounted for at fair value on a recurring basis | 49,247 | 49,779
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | (38) | (84)
Total liabilities accounted for at fair value on a recurring basis | (38) | (84)
Credit derivatives |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets | 1 | 21
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | 5 |
Foreign exchange 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 | 2 | (14)
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 | (45) | (70)
Asset backed securities ("ABS") |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 1,207 | 1,564
Collateralized Loan Obligations [Member] |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 3,011 | 2,780
CMBS |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 4,191 | 4,484
Corporate |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 18,861 | 20,273
Foreign government/government agencies |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 953 | 919
Municipal |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 8,878 | 9,503
RMBS |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 3,286 | 4,107
U.S. Treasuries |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 3,555 | 1,405
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 | 618 | 529
Equity securities, at fair value | 991 | 872
Derivative assets | 0 | 0
Fixed maturities, at fair value using the fair value option | 0 |
Short-term investments | 1,941 | 2,663
Total assets accounted for at fair value on a recurring basis | 3,550 | 4,064
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 |
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 | 618 | 529
Significant Observable Inputs (Level 2) |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 41,319 | 42,801
Equity securities, at fair value | 554 | 496
Derivative assets | 2 | 23
Fixed maturities, at fair value using the fair value option | 0 |
Short-term investments | 1,648 | 590
Total assets accounted for at fair value on a recurring basis | 43,523 | 43,910
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | (38) | (84)
Total liabilities accounted for at fair value on a recurring basis | (38) | (84)
Significant Observable Inputs (Level 2) | Credit derivatives |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets | 1 | 21
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | 5 |
Significant Observable Inputs (Level 2) | Foreign exchange 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 | 2 | (14)
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 | (45) | (70)
Significant Observable Inputs (Level 2) | Asset backed securities ("ABS") |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 1,184 | 1,564
Significant Observable Inputs (Level 2) | Collateralized Loan Obligations [Member] |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 2,657 | 2,420
Significant Observable Inputs (Level 2) | CMBS |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 4,090 | 4,407
Significant Observable Inputs (Level 2) | Corporate |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 17,607 | 19,392
Significant Observable Inputs (Level 2) | Foreign government/government agencies |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 948 | 913
Significant Observable Inputs (Level 2) | Municipal |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 8,878 | 9,503
Significant Observable Inputs (Level 2) | RMBS |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 3,018 | 3,726
Significant Observable Inputs (Level 2) | U.S. Treasuries |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 2,937 | 876
Significant Unobservable Inputs (Level 3) |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 2,005 | 1,705
Equity securities, at fair value | 71 | 70
Derivative assets | 0 | 0
Fixed maturities, at fair value using the fair value option | 75 |
Short-term investments | 23 | 30
Total assets accounted for at fair value on a recurring basis | 2,174 | 1,805
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 |
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 | 23 | 0
Significant Unobservable Inputs (Level 3) | Collateralized Loan Obligations [Member] |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 354 | 360
Significant Unobservable Inputs (Level 3) | CMBS |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 101 | 77
Significant Unobservable Inputs (Level 3) | Corporate |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 1,254 | 881
Significant Unobservable Inputs (Level 3) | Foreign government/government agencies |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 5 | 6
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 | 268 | 381
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
Fair Value Measured at Net Asset Value Per Share [Member] |  |
Liabilities accounted for at fair value on a recurring basis |  |
Deposit Assets | $ 62 | $ 54

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