Fair Value Measurements - Significant Unobservable Inputs Securities (Details) $ in Millions	Sep. 30, 2026 USD ($)	Dec. 31, 2025 USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Securities, Available-for-Sale	$ 45,902	$ 46,041
Other Short-term Investments	4,390	4,004
Equity Securities, FV-NI	535	422
Assets, Fair Value Disclosure	50,943	50,655
ABS
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Securities, Available-for-Sale	4,833	4,663
Collateralized Loan Obligations [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Securities, Available-for-Sale	3,652	3,316
CMBS
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Securities, Available-for-Sale	1,605	2,328
Corporate
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Securities, Available-for-Sale	23,517	23,076
RMBS
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Securities, Available-for-Sale	5,685	6,178
Significant Unobservable Inputs (Level 3)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Securities, Available-for-Sale	3,597	3,372
Other Short-term Investments	488	382
Equity Securities, FV-NI	124	106
Assets, Fair Value Disclosure	4,332	4,028
Significant Unobservable Inputs (Level 3) \| ABS
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Securities, Available-for-Sale	248	167
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	315	217
Significant Unobservable Inputs (Level 3) \| CMBS
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Securities, Available-for-Sale	82	115
Significant Unobservable Inputs (Level 3) \| Corporate
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Securities, Available-for-Sale	2,896	2,866
Significant Unobservable Inputs (Level 3) \| RMBS
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Securities, Available-for-Sale	56	7
Significant Unobservable Inputs (Level 3) \| Fair Value, Recurring [Member] \| ABS \| Valuation Technique, Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Securities, Available-for-Sale	$ 248	$ 167
Significant Unobservable Inputs (Level 3) \| Fair Value, Recurring [Member] \| ABS \| Minimum \| Measurement Input, Credit Spread [Member] \| Valuation Technique, Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Securities, Available-for-sale, Measurement Input	6	4.34
Significant Unobservable Inputs (Level 3) \| Fair Value, Recurring [Member] \| ABS \| Maximum \| Measurement Input, Credit Spread [Member] \| Valuation Technique, Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Securities, Available-for-sale, Measurement Input	10.05	8.43
Significant Unobservable Inputs (Level 3) \| Fair Value, Recurring [Member] \| ABS \| Weighted Average [Member] \| Measurement Input, Credit Spread [Member] \| Valuation Technique, Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Securities, Available-for-sale, Measurement Input	6.90	5.30
Significant Unobservable Inputs (Level 3) \| Fair Value, Recurring [Member] \| Collateralized Loan Obligations [Member] \| Valuation Technique, Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Securities, Available-for-Sale	$ 315	$ 217
Significant Unobservable Inputs (Level 3) \| Fair Value, Recurring [Member] \| Collateralized Loan Obligations [Member] \| Minimum \| Measurement Input, Credit Spread [Member] \| Valuation Technique, Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Securities, Available-for-sale, Measurement Input	2.79	2.70
Significant Unobservable Inputs (Level 3) \| Fair Value, Recurring [Member] \| Collateralized Loan Obligations [Member] \| Maximum \| Measurement Input, Credit Spread [Member] \| Valuation Technique, Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Securities, Available-for-sale, Measurement Input	10.05	10.21
Significant Unobservable Inputs (Level 3) \| Fair Value, Recurring [Member] \| Collateralized Loan Obligations [Member] \| Weighted Average [Member] \| Measurement Input, Credit Spread [Member] \| Valuation Technique, Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Securities, Available-for-sale, Measurement Input	5.48	5.44
Significant Unobservable Inputs (Level 3) \| Fair Value, Recurring [Member] \| CMBS \| Valuation Technique, Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Securities, Available-for-Sale	$ 82	$ 115
Significant Unobservable Inputs (Level 3) \| Fair Value, Recurring [Member] \| CMBS \| Minimum \| Measurement Input, Credit Spread [Member] \| Valuation Technique, Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Securities, Available-for-sale, Measurement Input	1	2.45
Significant Unobservable Inputs (Level 3) \| Fair Value, Recurring [Member] \| CMBS \| Maximum \| Measurement Input, Credit Spread [Member] \| Valuation Technique, Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Securities, Available-for-sale, Measurement Input	8.41	10
Significant Unobservable Inputs (Level 3) \| Fair Value, Recurring [Member] \| CMBS \| Weighted Average [Member] \| Measurement Input, Credit Spread [Member] \| Valuation Technique, Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Securities, Available-for-sale, Measurement Input	4.43	3.97
Significant Unobservable Inputs (Level 3) \| Fair Value, Recurring [Member] \| Corporate \| Valuation Technique, Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Securities, Available-for-Sale	$ 2,765	$ 2,765
Significant Unobservable Inputs (Level 3) \| Fair Value, Recurring [Member] \| Corporate \| Minimum \| Measurement Input, Credit Spread [Member] \| Valuation Technique, Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Securities, Available-for-sale, Measurement Input	0.79	0.88
Significant Unobservable Inputs (Level 3) \| Fair Value, Recurring [Member] \| Corporate \| Maximum \| Measurement Input, Credit Spread [Member] \| Valuation Technique, Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Securities, Available-for-sale, Measurement Input	11.50	8.11
Significant Unobservable Inputs (Level 3) \| Fair Value, Recurring [Member] \| Corporate \| Weighted Average [Member] \| Measurement Input, Credit Spread [Member] \| Valuation Technique, Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Securities, Available-for-sale, Measurement Input	2.87	2.89
Significant Unobservable Inputs (Level 3) \| Fair Value, Recurring [Member] \| RMBS \| Valuation Technique, Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Securities, Available-for-Sale	$ 56	$ 7
Significant Unobservable Inputs (Level 3) \| Fair Value, Recurring [Member] \| RMBS \| Minimum \| Measurement Input, Credit Spread [Member] \| Valuation Technique, Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Securities, Available-for-sale, Measurement Input	0.80	0.88
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	0.02
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	0.02	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	0.40	0.37
Significant Unobservable Inputs (Level 3) \| Fair Value, Recurring [Member] \| RMBS \| Maximum \| Measurement Input, Credit Spread [Member] \| Valuation Technique, Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Securities, Available-for-sale, Measurement Input	1.98	5.51
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	0.05
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	0.03	0.05
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	0.55	0.80
Significant Unobservable Inputs (Level 3) \| Fair Value, Recurring [Member] \| RMBS \| Weighted Average [Member] \| Measurement Input, Credit Spread [Member] \| Valuation Technique, Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Securities, Available-for-sale, Measurement Input	1.04	1.72
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	0.04	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	0.48	0.50
Significant Unobservable Inputs (Level 3) \| Fair Value, Recurring [Member] \| Short-term investments \| Valuation Technique, Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Other Short-term Investments	$ 488	$ 382
Significant Unobservable Inputs (Level 3) \| Fair Value, Recurring [Member] \| Short-term investments \| Minimum \| Measurement Input, Credit Spread [Member] \| Valuation Technique, Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Instrument, Measurement Input	1.69	1.64
Significant Unobservable Inputs (Level 3) \| Fair Value, Recurring [Member] \| Short-term investments \| Maximum \| Measurement Input, Credit Spread [Member] \| Valuation Technique, Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Instrument, Measurement Input	2.42	1.86
Significant Unobservable Inputs (Level 3) \| Fair Value, Recurring [Member] \| Short-term investments \| Weighted Average [Member] \| Measurement Input, Credit Spread [Member] \| Valuation Technique, Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Instrument, Measurement Input	1.77	1.77
Significant Unobservable Inputs (Level 3) \| Fair Value, Recurring [Member] \| Equity Securities [Member] \| Valuation Technique, Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Equity Securities, FV-NI	$ 15	$ 14
Significant Unobservable Inputs (Level 3) \| Fair Value, Recurring [Member] \| Equity Securities [Member] \| Valuation, Cost Approach
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Equity Securities, FV-NI	$ 82	$ 56
Significant Unobservable Inputs (Level 3) \| Fair Value, Recurring [Member] \| Equity Securities [Member] \| Minimum \| Measurement Input, Credit Spread [Member] \| Valuation Technique, Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Equity Securities, FV-NI, Measurement Input	15.30	13.70
Significant Unobservable Inputs (Level 3) \| Fair Value, Recurring [Member] \| Equity Securities [Member] \| Maximum \| Measurement Input, Credit Spread [Member] \| Valuation Technique, Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Equity Securities, FV-NI, Measurement Input	15.30	13.70
Significant Unobservable Inputs (Level 3) \| Fair Value, Recurring [Member] \| Equity Securities [Member] \| Weighted Average [Member] \| Measurement Input, Credit Spread [Member] \| Valuation Technique, Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Equity Securities, FV-NI, Measurement Input	15.30	13.70
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Securities, Available-for-Sale	$ 290	$ 164
Other Short-term Investments	193	491
Equity Securities, FV-NI	406	311
Assets, Fair Value Disclosure	889	966
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Discontinued Operations, Disposed of by Sale \| Hartford Funds Management Group, Inc
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Assets, Fair Value Disclosure	139	179
Quoted Prices in Active Markets for Identical Assets (Level 1) \| ABS
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Securities, Available-for-Sale	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Collateralized Loan Obligations [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Securities, Available-for-Sale	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) \| CMBS
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Securities, Available-for-Sale	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Corporate
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Securities, Available-for-Sale	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) \| RMBS
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Securities, Available-for-Sale	0	0
Significant Observable Inputs (Level 2)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Securities, Available-for-Sale	42,015	42,505
Other Short-term Investments	3,709	3,131
Equity Securities, FV-NI	5	5
Assets, Fair Value Disclosure	45,722	45,661
Significant Observable Inputs (Level 2) \| Discontinued Operations, Disposed of by Sale \| Hartford Funds Management Group, Inc
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Assets, Fair Value Disclosure	326	240
Significant Observable Inputs (Level 2) \| ABS
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Securities, Available-for-Sale	4,585	4,496
Significant Observable Inputs (Level 2) \| Collateralized Loan Obligations [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Securities, Available-for-Sale	3,337	3,099
Significant Observable Inputs (Level 2) \| CMBS
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Securities, Available-for-Sale	1,523	2,213
Significant Observable Inputs (Level 2) \| Corporate
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Securities, Available-for-Sale	20,621	20,210
Significant Observable Inputs (Level 2) \| RMBS
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Securities, Available-for-Sale	$ 5,629	$ 6,171

Fair value portion of asset recognized for present right to economic benefit.

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+ Details

Name:	us-gaap_AssetsFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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