Fair Value Measurements - Gross components of purchases, sales, issuances and settlements (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]
Purchases	$ 2,252	$ 2,888
Sales	(486)	(744)
Issuances and Settlements	(1,351)	(1,125)
Purchases, Sales, Issuances and Settlements, Net	415	1,019
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Liabilities [Abstract]
Purchases	0	0
Sales	430	309
Issuances and Settlements	(388)	(144)
Purchases, Sales, Issuances and Settlements, Net	42	165
Policyholder contract deposits
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Liabilities [Abstract]
Purchases	0	0
Sales	430	309
Issuances and Settlements	(230)	(161)
Purchases, Sales, Issuances and Settlements, Net	200	148
Derivative liabilities, net
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Liabilities [Abstract]
Purchases	0	0
Sales	0	0
Issuances and Settlements	(40)	34
Purchases, Sales, Issuances and Settlements, Net	(40)	34
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	(118)	(17)
Purchases, Sales, Issuances and Settlements, Net	(118)	(17)
Bonds available-for-sale
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]
Purchases	2,193	2,701
Sales	(449)	(700)
Issuances and Settlements	(1,260)	(938)
Purchases, Sales, Issuances and Settlements, Net	484	1,063
Bonds available-for-sale \| Obligations of states, municipalities and political subdivisions
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]
Purchases	13	25
Sales	(23)	(25)
Issuances and Settlements	0	(1)
Purchases, Sales, Issuances and Settlements, Net	(10)	(1)
Bonds available-for-sale \| Corporate debt
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]
Purchases	190	340
Sales	0	(86)
Issuances and Settlements	(192)	(149)
Purchases, Sales, Issuances and Settlements, Net	(2)	105
Bonds available-for-sale \| RMBS
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]
Purchases	453	266
Sales	(79)	(43)
Issuances and Settlements	(176)	(169)
Purchases, Sales, Issuances and Settlements, Net	198	54
Bonds available-for-sale \| CMBS
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]
Purchases	17	7
Sales	(5)	(7)
Issuances and Settlements	(65)	(8)
Purchases, Sales, Issuances and Settlements, Net	(53)	(8)
Bonds available-for-sale \| CLO
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]
Purchases	98	183
Sales	0	0
Issuances and Settlements	(2)	(102)
Purchases, Sales, Issuances and Settlements, Net	96	81
Bonds available-for-sale \| ABS
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]
Purchases	1,422	1,880
Sales	(342)	(539)
Issuances and Settlements	(825)	(509)
Purchases, Sales, Issuances and Settlements, Net	255	832
Other bond securities
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]
Purchases	52	57
Sales	(37)	(44)
Issuances and Settlements	(77)	(60)
Purchases, Sales, Issuances and Settlements, Net	(62)	(47)
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	12	5
Sales	0	(13)
Issuances and Settlements	(8)	(5)
Purchases, Sales, Issuances and Settlements, Net	4	(13)
Other bond securities \| RMBS
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]
Purchases	0	14
Sales	0	(14)
Issuances and Settlements	(1)	(4)
Purchases, Sales, Issuances and Settlements, Net	(1)	(4)
Other bond securities \| CMBS
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]
Purchases	0	0
Sales	0	0
Issuances and Settlements	(10)	0
Purchases, Sales, Issuances and Settlements, Net	(10)	0
Other bond securities \| CLO
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]
Purchases	0	0
Sales	0	0
Issuances and Settlements	0	(2)
Purchases, Sales, Issuances and Settlements, Net	0	(2)
Other bond securities \| ABS
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]
Purchases	40	38
Sales	(37)	(17)
Issuances and Settlements	(58)	(49)
Purchases, Sales, Issuances and Settlements, Net	(55)	(28)
Equity securities
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]
Purchases	0	0
Sales	0	0
Issuances and Settlements	0	0
Purchases, Sales, Issuances and Settlements, Net	0	0
Other invested assets
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]
Purchases	7	130
Sales	0	0
Issuances and Settlements	(14)	(127)
Purchases, Sales, Issuances and Settlements, Net	$ (7)	$ 3

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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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