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v3.25.2

Fair Value Measurements - Significant Unobservable Inputs Securities (Details) $ in Millions | Jun. 30, 2025 USD ($) | Dec. 31, 2024 USD ($)
--- | --- | ---
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | $ 44,558 | $ 42,567
Other Short-term Investments | 3,649 | 4,068
ABS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | 4,376 | 3,937
Collateralized Loan Obligations [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | 3,393 | 3,250
CMBS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | 2,585 | 2,736
Corporate |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | 22,525 | 20,636
RMBS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | 5,513 | 5,230
Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | 3,045 | 2,610
Other Short-term Investments | 116 | 98
Significant Unobservable Inputs (Level 3) | ABS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | 92 | 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 | 70 | 116
Significant Unobservable Inputs (Level 3) | CMBS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | 137 | 167
Significant Unobservable Inputs (Level 3) | Corporate |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt Securities, Available-for-sale | 2,734 | 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 | 12 | 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 | $ 84 |
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 | 4.87 |
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 | 7.52 |
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 | 5.05 |
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 | $ 55 |
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 | 4.50 |
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 | 10.09 |
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 | 8.51 |
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 | $ 136 | $ 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 | 18.97 | 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 | 5.63 | 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 | $ 2,620 | $ 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 | 0.84 | 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 | 7.37 | 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 | 2.74 | 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 | $ 12 | $ 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 | 0.61 | 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 | 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 | 0.35 | 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 | 5.73 | 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 | 1.83 | 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 | 0.44 | 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 | $ 116 | $ 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 | 1.56 | 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 | 2.69 | 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 | 2.20 | 2.66

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