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Fair Value Measurements - Significant Unobservable Inputs Securities (Details) $ in Millions | Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
--- | --- | ---
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | $ 40,840 | $ 39,818
Other Short-term Investments | 2,975 | 3,850
Collateralized Loan Obligations [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | 3,168 | 3,090
CMBS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | 3,050 | 3,125
Corporate |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | 18,657 | 17,866
RMBS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | 4,473 | 4,287
Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | 2,433 | 2,237
Other Short-term Investments | 26 | 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 | 184 | 113
Significant Unobservable Inputs (Level 3) | CMBS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | 241 | 227
Significant Unobservable Inputs (Level 3) | Corporate |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | 1,923 | 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 | 69 | 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 | $ 124 | $ 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 | 2.59 | 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 | 2.60 | 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 | 2.60 | 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 | $ 239 | $ 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 | 2.35 | 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 | 12.25 | 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 | 4.30 | 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 | $ 1,806 | $ 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 | 0.07 | 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 | 7.14 | 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 | 3.04 | 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 | $ 69 | $ 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 | 0.44 | 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 | 4.20 | 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 | 1.58 | 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 | 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 | 0.03 | 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 | 8.87 | 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 | 8.87 | 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 | 8.87 | 12.25

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