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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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