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v3.25.1

Fair Value Measurements - Significant Unobservable Inputs Securities (Details) $ in Millions | Mar. 31, 2025 USD ($) | Dec. 31, 2024 USD ($)
--- | --- | ---
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | $ 44,204 | $ 42,567
Other Short-term Investments | 3,366 | 4,068
ABS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | 4,333 | 3,937
Collateralized Loan Obligations [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | 3,396 | 3,250
CMBS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | 2,754 | 2,736
Corporate |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | 21,646 | 20,636
RMBS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | 5,558 | 5,230
Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | 2,879 | 2,610
Other Short-term Investments | 59 | 98
Significant Unobservable Inputs (Level 3) | ABS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | 56 | 22
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 | 233 | 116
Significant Unobservable Inputs (Level 3) | CMBS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | 150 | 167
Significant Unobservable Inputs (Level 3) | Corporate |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | 2,401 | 2,281
Significant Unobservable Inputs (Level 3) | RMBS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | 39 | 24
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] | ABS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | $ 48 |
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] | ABS | Minimum | Measurement Input, Credit Spread [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 4.81 |
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] | ABS | Maximum | Measurement Input, Credit Spread [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 8.08 |
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] | ABS | Weighted Average [Member] | Measurement Input, Credit Spread [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 5.03 |
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] | Collateralized Loan Obligations [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | $ 98 |
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] | Collateralized Loan Obligations [Member] | Minimum | Measurement Input, Credit Spread [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 4.58 |
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] | Collateralized Loan Obligations [Member] | Maximum | Measurement Input, Credit Spread [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 10.23 |
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] | Collateralized Loan Obligations [Member] | Weighted Average [Member] | Measurement Input, Credit Spread [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 7.88 |
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] | CMBS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | $ 149 | $ 166
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] | CMBS | Minimum | Measurement Input, Credit Spread [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 2 | 2
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] | CMBS | Maximum | Measurement Input, Credit Spread [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 18.74 | 12.21
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] | CMBS | Weighted Average [Member] | Measurement Input, Credit Spread [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 5.67 | 4.18
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] | Corporate |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | $ 2,287 | $ 2,166
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] | Corporate | Minimum | Measurement Input, Credit Spread [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.10 | 0.81
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] | Corporate | Maximum | Measurement Input, Credit Spread [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 7 | 7.94
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] | Corporate | Weighted Average [Member] | Measurement Input, Credit Spread [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 2.81 | 2.86
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] | RMBS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | $ 39 | $ 19
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] | RMBS | Minimum | Measurement Input, Credit Spread [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.63 | 1
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] | RMBS | Minimum | Measurement Input, Constant Prepayment Rate [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.02 | 0.01
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] | RMBS | Minimum | Measurement Input, Default Rate [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.01 | 0.01
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] | RMBS | Minimum | Measurement Input, Loss Severity [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.33 | 0.30
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] | RMBS | Maximum | Measurement Input, Credit Spread [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 5.68 | 3.72
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] | RMBS | Maximum | Measurement Input, Constant Prepayment Rate [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.05 | 0.06
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] | RMBS | Maximum | Measurement Input, Default Rate [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.05 | 0.04
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] | RMBS | Maximum | Measurement Input, Loss Severity [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.50 | 0.50
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] | RMBS | Weighted Average [Member] | Measurement Input, Credit Spread [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 1.78 | 1.81
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] | RMBS | Weighted Average [Member] | Measurement Input, Constant Prepayment Rate [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.03 | 0.04
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] | RMBS | Weighted Average [Member] | Measurement Input, Default Rate [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.02 | 0.02
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] | RMBS | Weighted Average [Member] | Measurement Input, Loss Severity [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.42 | 0.41
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] | Short-term investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Other Short-term Investments | $ 59 | $ 98
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] | Short-term investments | Minimum | Measurement Input, Credit Spread [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Instrument, Measurement Input | 2.78 | 2.66
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] | Short-term investments | Maximum | Measurement Input, Credit Spread [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Instrument, Measurement Input | 2.78 | 2.66
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring [Member] | Short-term investments | Weighted Average [Member] | Measurement Input, Credit Spread [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Instrument, Measurement Input | 2.78 | 2.66

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