Fair Value Measurements - Gross components of purchases, sales, issuances and settlements (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]
Purchases	$ 9,891	$ 10,223
Sales	(2,242)	(1,894)
Issuances and Settlements	(5,854)	(4,374)
Purchases, Sales, Issuances and Settlements, Net	1,795	3,955
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Liabilities [Abstract]
Purchases	0	0
Sales	1,917	1,564
Issuances and Settlements	(1,213)	(1,326)
Purchases, Sales, Issuances and Settlements, Net	704	238
Policyholder contract deposits
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Liabilities [Abstract]
Purchases	0	0
Sales	1,917	1,564
Issuances and Settlements	(1,231)	(950)
Purchases, Sales, Issuances and Settlements, Net	686	614
Derivative liabilities, net
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Liabilities [Abstract]
Purchases	0	0
Sales	0	0
Issuances and Settlements	170	101
Purchases, Sales, Issuances and Settlements, Net	170	101
Fortitude Re funds withheld payable
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Liabilities [Abstract]
Purchases	0	0
Sales	0	0
Issuances and Settlements	(152)	(477)
Purchases, Sales, Issuances and Settlements, Net	(152)	(477)
Bonds available-for-sale
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]
Purchases	9,479	9,474
Sales	(2,180)	(1,852)
Issuances and Settlements	(5,363)	(3,910)
Purchases, Sales, Issuances and Settlements, Net	1,936	3,712
Bonds available-for-sale \| Obligations of states, municipalities and political subdivisions
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]
Purchases	67	22
Sales	(69)	(24)
Issuances and Settlements	(2)	(2)
Purchases, Sales, Issuances and Settlements, Net	(4)	(4)
Bonds available-for-sale \| Corporate debt
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]
Purchases	773	507
Sales	(116)	(330)
Issuances and Settlements	(288)	(271)
Purchases, Sales, Issuances and Settlements, Net	369	(94)
Bonds available-for-sale \| RMBS
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]
Purchases	614	1,552
Sales	(63)	(583)
Issuances and Settlements	(730)	(814)
Purchases, Sales, Issuances and Settlements, Net	(179)	155
Bonds available-for-sale \| CMBS
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]
Purchases	20	59
Sales	(39)	(113)
Issuances and Settlements	(137)	(126)
Purchases, Sales, Issuances and Settlements, Net	(156)	(180)
Bonds available-for-sale \| CLO
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]
Purchases	800	1,247
Sales	(2)	(153)
Issuances and Settlements	(459)	(541)
Purchases, Sales, Issuances and Settlements, Net	339	553
Bonds available-for-sale \| ABS
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]
Purchases	7,205	6,087
Sales	(1,891)	(649)
Issuances and Settlements	(3,747)	(2,156)
Purchases, Sales, Issuances and Settlements, Net	1,567	3,282
Other bond securities
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]
Purchases	171	460
Sales	(56)	(40)
Issuances and Settlements	(144)	(195)
Purchases, Sales, Issuances and Settlements, Net	(29)	225
Other bond securities \| Obligations of states, municipalities and political subdivisions
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]
Purchases, Sales, Issuances and Settlements, Net	0	0
Other bond securities \| Corporate debt
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]
Purchases	10	10
Sales	(12)	0
Issuances and Settlements	(12)	0
Purchases, Sales, Issuances and Settlements, Net	(14)	10
Other bond securities \| RMBS
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]
Purchases	26	0
Sales	(26)	0
Issuances and Settlements	(8)	(11)
Purchases, Sales, Issuances and Settlements, Net	(8)	(11)
Other bond securities \| CMBS
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]
Purchases	1	0
Sales	(1)	(4)
Issuances and Settlements	0	0
Purchases, Sales, Issuances and Settlements, Net	0	(4)
Other bond securities \| CLO
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]
Purchases	12	23
Sales	0	0
Issuances and Settlements	(5)	(16)
Purchases, Sales, Issuances and Settlements, Net	7	7
Other bond securities \| ABS
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]
Purchases	122	427
Sales	(17)	(36)
Issuances and Settlements	(119)	(168)
Purchases, Sales, Issuances and Settlements, Net	(14)	223
Equity securities
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]
Purchases	17	7
Sales	(6)	(2)
Issuances and Settlements	(7)	0
Purchases, Sales, Issuances and Settlements, Net	4	5
Other invested assets
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]
Purchases	224	282
Sales	0	0
Issuances and Settlements	(340)	(269)
Purchases, Sales, Issuances and Settlements, Net	$ (116)	$ 13

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Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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