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Fair Value Measurements - Significant Unobservable Inputs Securities (Details) $ in Millions | Jun. 30, 2024 USD ($) | Dec. 31, 2023 USD ($)
--- | --- | ---
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | $ 40,814 | $ 39,818
Other Short-term Investments | 3,701 | 3,850
Collateralized Loan Obligations [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | 3,514 | 3,090
CMBS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | 2,942 | 3,125
Corporate |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | 19,493 | 17,866
RMBS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | 4,787 | 4,287
Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | 2,799 | 2,237
Other Short-term Investments | 25 | 25
Significant Unobservable Inputs (Level 3) | Collateralized Loan Obligations [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | 500 | 113
Significant Unobservable Inputs (Level 3) | CMBS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | 190 | 227
Significant Unobservable Inputs (Level 3) | Corporate |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | 2,061 | 1,861
Significant Unobservable Inputs (Level 3) | RMBS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | 40 | 36
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) | Collateralized Loan Obligations [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | $ 97 | $ 98
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) | Collateralized Loan Obligations [Member] | Measurement Input, Credit Spread [Member] | Minimum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 2.75 | 2.68
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) | Collateralized Loan Obligations [Member] | Measurement Input, Credit Spread [Member] | Maximum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 2.75 | 2.70
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) | Collateralized Loan Obligations [Member] | Measurement Input, Credit Spread [Member] | Weighted Average [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 2.75 | 2.69
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) | CMBS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | $ 188 | $ 226
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) | CMBS | Measurement Input, Credit Spread [Member] | Minimum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 1.90 | 3.65
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) | CMBS | Measurement Input, Credit Spread [Member] | Maximum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 12.93 | 13.15
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) | CMBS | Measurement Input, Credit Spread [Member] | Weighted Average [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 4.51 | 5.09
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) | Corporate |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | $ 1,945 | $ 1,741
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) | Corporate | Measurement Input, Credit Spread [Member] | Minimum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.11 | 0.49
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) | Corporate | Measurement Input, Credit Spread [Member] | Maximum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 17.21 | 7.43
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) | Corporate | Measurement Input, Credit Spread [Member] | Weighted Average [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 3.35 | 3.23
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) | RMBS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | $ 27 | $ 36
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) | RMBS | Measurement Input, Credit Spread [Member] | Minimum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.89 | 0.32
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) | RMBS | Measurement Input, Credit Spread [Member] | Maximum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 4.18 | 2.98
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) | RMBS | Measurement Input, Credit Spread [Member] | Weighted Average [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 1.57 | 1.61
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) | RMBS | Measurement Input, Constant Prepayment Rate [Member] | Minimum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.01 | 0.01
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) | RMBS | Measurement Input, Constant Prepayment Rate [Member] | Maximum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.17 | 0.05
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) | RMBS | Measurement Input, Constant Prepayment Rate [Member] | Weighted Average [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.04 | 0.04
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) | RMBS | Measurement Input, Default Rate [Member] | Minimum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.01 | 0.01
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) | RMBS | Measurement Input, Default Rate [Member] | Maximum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.04 | 0.05
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) | RMBS | Measurement Input, Default Rate [Member] | Weighted Average [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.02 | 0.02
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) | RMBS | Measurement Input, Loss Severity [Member] | Minimum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.30 | 0.10
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) | RMBS | Measurement Input, Loss Severity [Member] | Maximum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.64 | 0.70
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) | RMBS | Measurement Input, Loss Severity [Member] | Weighted Average [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.38 | 0.41
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) | Short-term investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Other Short-term Investments | $ 16 | $ 15
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) | Short-term investments | Measurement Input, Credit Spread [Member] | Minimum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Instrument, Measurement Input | 9.11 | 5.79
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) | Short-term investments | Measurement Input, Credit Spread [Member] | Maximum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Instrument, Measurement Input | 9.11 | 12.54
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) | Short-term investments | Measurement Input, Credit Spread [Member] | Weighted Average [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Instrument, Measurement Input | 9.11 | 12.25

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