Fair Value Measurements - Gross components of purchases, sales, issuances and settlements (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Assets:
Purchases	$ 1,759	$ 1,294	$ 4,011	$ 4,182
Sales	(137)	(144)	(623)	(888)
Issuances and Settlements	(1,495)	(1,316)	(2,846)	(2,441)
Purchases, Sales, Issuances and Settlements, Net	127	(166)	542	853
Liabilities:
Purchases	0	0	0	0
Sales	419	549	849	858
Issuances and Settlements	(216)	(346)	(604)	(490)
Purchases, Sales, Issuances and Settlements, Net	203	203	245	368
Policyholder contract deposits
Liabilities:
Purchases	0	0	0	0
Sales	419	549	849	858
Issuances and Settlements	(377)	(301)	(607)	(462)
Purchases, Sales, Issuances and Settlements, Net	42	248	242	396
Derivative liabilities, net
Liabilities:
Purchases	0	0	0	0
Sales	0	0	0	0
Issuances and Settlements	169	6	129	40
Purchases, Sales, Issuances and Settlements, Net	169	6	129	40
Fortitude Re funds withheld payable
Liabilities:
Purchases	0	0	0	0
Sales	0	0	0	0
Issuances and Settlements	(8)	(51)	(126)	(68)
Purchases, Sales, Issuances and Settlements, Net	(8)	(51)	(126)	(68)
Bonds available-for-sale
Assets:
Purchases	1,727	1,197	3,920	3,898
Sales	(137)	(127)	(586)	(827)
Issuances and Settlements	(1,422)	(1,248)	(2,682)	(2,186)
Purchases, Sales, Issuances and Settlements, Net	168	(178)	652	885
Bonds available-for-sale \| Obligations of states, municipalities and political subdivisions
Assets:
Purchases	2	10	15	35
Sales	0	(13)	(23)	(38)
Issuances and Settlements	(2)	0	(2)	(1)
Purchases, Sales, Issuances and Settlements, Net	0	(3)	(10)	(4)
Bonds available-for-sale \| Corporate debt
Assets:
Purchases	137	34	327	374
Sales	(2)	(20)	(2)	(106)
Issuances and Settlements	(178)	(49)	(370)	(198)
Purchases, Sales, Issuances and Settlements, Net	(43)	(35)	(45)	70
Bonds available-for-sale \| RMBS
Assets:
Purchases	24	13	477	279
Sales	(12)	(17)	(91)	(60)
Issuances and Settlements	(204)	(199)	(380)	(368)
Purchases, Sales, Issuances and Settlements, Net	(192)	(203)	6	(149)
Bonds available-for-sale \| CMBS
Assets:
Purchases	32	5	49	12
Sales	(35)	(12)	(40)	(19)
Issuances and Settlements	(21)	(5)	(86)	(13)
Purchases, Sales, Issuances and Settlements, Net	(24)	(12)	(77)	(20)
Bonds available-for-sale \| CLO
Assets:
Purchases	418	143	516	326
Sales	(3)	0	(3)	0
Issuances and Settlements	(146)	(162)	(148)	(264)
Purchases, Sales, Issuances and Settlements, Net	269	(19)	365	62
Bonds available-for-sale \| ABS
Assets:
Purchases	1,114	992	2,536	2,872
Sales	(85)	(65)	(427)	(604)
Issuances and Settlements	(871)	(833)	(1,696)	(1,342)
Purchases, Sales, Issuances and Settlements, Net	158	94	413	926
Other bond securities
Assets:
Purchases	17	61	69	118
Sales	0	(11)	(37)	(55)
Issuances and Settlements	(45)	(28)	(122)	(88)
Purchases, Sales, Issuances and Settlements, Net	(28)	22	(90)	(25)
Other bond securities \| Obligations of states, municipalities and political subdivisions
Assets:
Purchases	0	0
Sales	0	0
Issuances and Settlements	0	0
Purchases, Sales, Issuances and Settlements, Net	0	0	0	0
Other bond securities \| Corporate debt
Assets:
Purchases	4	5	16	10
Sales	0	1	0	(12)
Issuances and Settlements	(2)	(7)	(10)	(12)
Purchases, Sales, Issuances and Settlements, Net	2	(1)	6	(14)
Other bond securities \| RMBS
Assets:
Purchases	3	11	3	25
Sales	0	(11)	0	(25)
Issuances and Settlements	(1)	(1)	(2)	(5)
Purchases, Sales, Issuances and Settlements, Net	2	(1)	1	(5)
Other bond securities \| CMBS
Assets:
Purchases	0	1	0	1
Sales	0	(1)	0	(1)
Issuances and Settlements	0	0	(10)	0
Purchases, Sales, Issuances and Settlements, Net	0	0	(10)	0
Other bond securities \| CLO
Assets:
Purchases	0	6	0	6
Sales	0	0	0	0
Issuances and Settlements	0	0	0	(2)
Purchases, Sales, Issuances and Settlements, Net	0	6	0	4
Other bond securities \| ABS
Assets:
Purchases	10	38	50	76
Sales	0	0	(37)	(17)
Issuances and Settlements	(42)	(20)	(100)	(69)
Purchases, Sales, Issuances and Settlements, Net	(32)	18	(87)	(10)
Equity securities
Assets:
Purchases	0	6	0	6
Sales	0	(6)	0	(6)
Issuances and Settlements	(6)	0	(6)	0
Purchases, Sales, Issuances and Settlements, Net	(6)	0	(6)	0
Other invested assets
Assets:
Purchases	15	30	22	160
Sales	0	0	0	0
Issuances and Settlements	(22)	(40)	(36)	(167)
Purchases, Sales, Issuances and Settlements, Net	$ (7)	$ (10)	$ (14)	$ (7)

Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets

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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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