Fair Value Measurements - Gross components of purchases, sales, issuances and settlements (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]
Purchases	$ 2,885	$ 715	$ 5,400	$ 1,921
Sales	(109)	(63)	(194)	(69)
Issuances and Settlements	(1,095)	(403)	(1,984)	(768)
Purchases, Sales, Issuances and Settlements, Net	1,681	249	3,222	1,084
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Liabilities [Abstract]
Purchases	1	(100)	0	(201)
Sales	392	402	724	728
Issuances and Settlements	(516)	(336)	(744)	(1,027)
Purchases, Sales, Issuances and Settlements, Net	(123)	(34)	(20)	(500)
Policyholder contract deposits
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Liabilities [Abstract]
Purchases	0	0	0	0
Sales	392	402	724	728
Issuances and Settlements	(178)	(82)	(354)	(92)
Purchases, Sales, Issuances and Settlements, Net	214	320	370	636
Derivative liabilities, net
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Liabilities [Abstract]
Purchases	1	(100)	0	(201)
Sales	0	0	0	0
Issuances and Settlements	(76)	(55)	(179)	(223)
Purchases, Sales, Issuances and Settlements, Net	(75)	(155)	(179)	(424)
Fortitude Re funds withheld payable
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Liabilities [Abstract]
Purchases	0	0	0	0
Sales	0	0	0	0
Issuances and Settlements	(262)	(192)	(211)	(705)
Purchases, Sales, Issuances and Settlements, Net	(262)	(192)	(211)	(705)
Debt of consolidated investment entities
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Liabilities [Abstract]
Purchases		0		0
Sales		0		0
Issuances and Settlements		(7)		(7)
Purchases, Sales, Issuances and Settlements, Net		(7)		(7)
Bonds available-for-sale
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]
Purchases	2,605	483	5,028	1,555
Sales	(107)	(63)	(192)	(69)
Issuances and Settlements	(1,018)	(306)	(1,755)	(543)
Purchases, Sales, Issuances and Settlements, Net	1,480	114	3,081	943
Bonds available-for-sale \| Obligations of states, municipalities and political subdivisions
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]
Purchases	0	0	0	0
Sales	0	0	0	0
Issuances and Settlements	0	(1)	(1)	(3)
Purchases, Sales, Issuances and Settlements, Net	0	(1)	(1)	(3)
Bonds available-for-sale \| Corporate debt
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]
Purchases	54	2	69	30
Sales	(8)	0	(8)	0
Issuances and Settlements	(125)	(43)	(131)	(57)
Purchases, Sales, Issuances and Settlements, Net	(79)	(41)	(70)	(27)
Bonds available-for-sale \| RMBS
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]
Purchases	465	64	1,039	231
Sales	(49)	(42)	(49)	(42)
Issuances and Settlements	(208)	(196)	(378)	(371)
Purchases, Sales, Issuances and Settlements, Net	208	(174)	612	(182)
Bonds available-for-sale \| CMBS
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]
Purchases	9	0	9	9
Sales	0	(21)	(30)	(27)
Issuances and Settlements	(33)	(19)	(106)	(22)
Purchases, Sales, Issuances and Settlements, Net	(24)	(40)	(127)	(40)
Bonds available-for-sale \| CLO
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]
Purchases	90	72	220	82
Sales	0	0	(2)	0
Issuances and Settlements	(33)	(138)	(140)	(127)
Purchases, Sales, Issuances and Settlements, Net	57	(66)	78	(45)
Bonds available-for-sale \| ABS
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]
Purchases	1,987	345	3,691	1,203
Sales	(50)	0	(103)	0
Issuances and Settlements	(619)	91	(999)	37
Purchases, Sales, Issuances and Settlements, Net	1,318	436	2,589	1,240
Other bond securities
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]
Purchases	246	150	276	190
Sales	0	0	0	0
Issuances and Settlements	(38)	(95)	(98)	(212)
Purchases, Sales, Issuances and Settlements, Net	208	55	178	(22)
Other bond securities \| Obligations of states, municipalities and political subdivisions
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]
Purchases	0	2	0	3
Sales	0	0	0	0
Issuances and Settlements	0	0	0	0
Purchases, Sales, Issuances and Settlements, Net	0	2	0	3
Other bond securities \| Corporate debt
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]
Purchases	10	67	10	67
Sales	0	0	0	0
Issuances and Settlements	0	(87)	0	(183)
Purchases, Sales, Issuances and Settlements, Net	10	(20)	10	(116)
Other bond securities \| RMBS
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]
Purchases	0	0	0	6
Sales	0	0	0	0
Issuances and Settlements	(3)	(4)	(6)	(7)
Purchases, Sales, Issuances and Settlements, Net	(3)	(4)	(6)	(1)
Other bond securities \| CMBS
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]
Purchases	0	0	0	0
Sales	0	0	0	0
Issuances and Settlements	0	0	0	0
Purchases, Sales, Issuances and Settlements, Net	0	0	0	0
Other bond securities \| CLO
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]
Purchases	8	0	9	1
Sales	0	0	0	0
Issuances and Settlements	(16)	(47)	(16)	(47)
Purchases, Sales, Issuances and Settlements, Net	(8)	(47)	(7)	(46)
Other bond securities \| ABS
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]
Purchases	228	81	257	113
Sales	0	0	0	0
Issuances and Settlements	(19)	43	(76)	25
Purchases, Sales, Issuances and Settlements, Net	209	124	181	138
Equity securities
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]
Purchases	7	1	7	25
Sales	(2)	0	(2)	0
Issuances and Settlements	0	0	0	0
Purchases, Sales, Issuances and Settlements, Net	5	1	5	25
Other invested assets
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Assets [Abstract]
Purchases	27	81	89	151
Sales	0	0	0	0
Issuances and Settlements	(39)	(2)	(131)	(13)
Purchases, Sales, Issuances and Settlements, Net	$ (12)	$ 79	$ (42)	$ 138

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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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Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
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-Name Accounting Standards Codification
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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
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