Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Assets:
Bonds available for sale	$ 71,184	$ 64,006
Other bond securities	743	745
Equity securities	829	704
Derivative assets	388	624
Counterparty netting	(179)	(270)
Cash Collateral	$ (207)	$ (304)
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other assets	Other assets
Derivative assets	$ 2	$ 50
Short-term investments	9,417	14,462
Liabilities:
Derivative liabilities	444	622
Counterparty netting	(179)	(270)
Cash Collateral	$ (216)	$ (201)
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Other Liabilities	Other Liabilities
Derivative liabilities	$ 49	$ 151
Fortitude Re funds withheld payable	(3,094)	(3,207)
Fair Value Using NAV Per Share (or its equivalent)	3,889	4,032
Corebridge Financial Inc
Liabilities:
Corebridge retained investment	2,700	3,800
U.S. government and government sponsored entities
Assets:
Bonds available for sale	3,787	3,267
Obligations of states, municipalities and political subdivisions
Assets:
Bonds available for sale	2,889	3,143
Non-U.S. governments
Assets:
Bonds available for sale	6,613	8,107
Corporate debt
Assets:
Bonds available for sale	36,951	31,826
RMBS
Assets:
Bonds available for sale	10,303	8,604
CMBS
Assets:
Bonds available for sale	4,190	3,926
CLO/ABS
Assets:
Bonds available for sale	6,451	5,133
Level 3 | Obligations of states, municipalities and political subdivisions
Assets:
Bonds available for sale	3	3
Level 3 | Corporate debt
Assets:
Bonds available for sale	20	177
Level 3 | RMBS
Assets:
Bonds available for sale	1,197	1,321
Level 3 | CMBS
Assets:
Bonds available for sale	5	25
Fair Value Measured at Net Asset Value Per Share
Liabilities:
Fair Value Using NAV Per Share (or its equivalent)	3,500	3,300
Recurring Basis
Assets:
Counterparty netting	(179)	(270)
Cash Collateral	(207)	(304)
Derivative assets	2	50
Short-term investments	4,860	9,789
Liabilities:
Counterparty netting	(179)	(270)
Cash Collateral	(216)	(201)
Derivative liabilities	49	151
Fortitude Re funds withheld payable	(103)	(128)
Other liabilities	121	251
Recurring Basis | Levels 1, 2 and 3
Assets:
Bonds available for sale	71,184	64,006
Other bond securities	743	745
Equity securities	829	704
Other invested assets	2,967	4,092
Short-term investments	4,860	9,789
Other assets	129	129
Total	80,714	79,515
Liabilities:
Fortitude Re funds withheld payable	(103)	(128)
Other liabilities	72	100
Total	18	123
Recurring Basis | Levels 1, 2 and 3 | U.S. government and government sponsored entities
Assets:
Bonds available for sale	3,787	3,267
Recurring Basis | Levels 1, 2 and 3 | Obligations of states, municipalities and political subdivisions
Assets:
Bonds available for sale	2,889	3,143
Other bond securities	51	50
Recurring Basis | Levels 1, 2 and 3 | Non-U.S. governments
Assets:
Bonds available for sale	6,613	8,107
Other bond securities	22	24
Recurring Basis | Levels 1, 2 and 3 | Corporate debt
Assets:
Bonds available for sale	36,951	31,826
Other bond securities	258	282
Recurring Basis | Levels 1, 2 and 3 | RMBS
Assets:
Bonds available for sale	10,303	8,604
Other bond securities	99	100
Recurring Basis | Levels 1, 2 and 3 | CMBS
Assets:
Bonds available for sale	4,190	3,926
Other bond securities	42	43
Recurring Basis | Levels 1, 2 and 3 | CLO/ABS
Assets:
Bonds available for sale	6,451	5,133
Other bond securities	271	246
Recurring Basis | Level 1
Assets:
Bonds available for sale	229	197
Other bond securities	0	0
Equity securities	767	689
Other invested assets	2,651	3,810
Derivative assets	0	0
Short-term investments	3,433	7,942
Other assets	0	0
Total	7,080	12,638
Liabilities:
Derivative liabilities	0	0
Fortitude Re funds withheld payable	0	0
Other liabilities	0	0
Total	0	0
Recurring Basis | Level 1 | U.S. government and government sponsored entities
Assets:
Bonds available for sale	177	36
Recurring Basis | Level 1 | Obligations of states, municipalities and political subdivisions
Assets:
Bonds available for sale	0	0
Other bond securities	0	0
Recurring Basis | Level 1 | Non-U.S. governments
Assets:
Bonds available for sale	52	161
Other bond securities	0	0
Recurring Basis | Level 1 | Corporate debt
Assets:
Bonds available for sale	0	0
Other bond securities	0	0
Recurring Basis | Level 1 | RMBS
Assets:
Bonds available for sale	0	0
Other bond securities	0	0
Recurring Basis | Level 1 | CMBS
Assets:
Bonds available for sale	0	0
Other bond securities	0	0
Recurring Basis | Level 1 | CLO/ABS
Assets:
Bonds available for sale	0	0
Other bond securities	0	0
Recurring Basis | Level 2
Assets:
Bonds available for sale	67,691	60,799
Other bond securities	557	581
Equity securities	1	0
Other invested assets	223	119
Derivative assets	356	573
Short-term investments	1,427	1,847
Other assets	0	0
Total	70,255	63,919
Liabilities:
Derivative liabilities	412	571
Fortitude Re funds withheld payable	0	0
Other liabilities	0	0
Total	412	571
Recurring Basis | Level 2 | U.S. government and government sponsored entities
Assets:
Bonds available for sale	3,610	3,231
Recurring Basis | Level 2 | Obligations of states, municipalities and political subdivisions
Assets:
Bonds available for sale	2,886	3,140
Other bond securities	51	50
Recurring Basis | Level 2 | Non-U.S. governments
Assets:
Bonds available for sale	6,554	7,939
Other bond securities	22	24
Recurring Basis | Level 2 | Corporate debt
Assets:
Bonds available for sale	36,831	31,586
Other bond securities	257	281
Recurring Basis | Level 2 | RMBS
Assets:
Bonds available for sale	8,677	6,710
Other bond securities	46	50
Recurring Basis | Level 2 | CMBS
Assets:
Bonds available for sale	4,168	3,900
Other bond securities	42	43
Recurring Basis | Level 2 | CLO/ABS
Assets:
Bonds available for sale	4,965	4,293
Other bond securities	139	133
Recurring Basis | Level 3
Assets:
Bonds available for sale	3,264	3,010
Other bond securities	186	164
Equity securities	61	15
Other invested assets	93	163
Derivative assets	32	51
Short-term investments	0	0
Other assets	129	129
Total	3,765	3,532
Liabilities:
Derivative liabilities	32	51
Fortitude Re funds withheld payable	(103)	(128)
Other liabilities	72	100
Total	1	23
Recurring Basis | Level 3 | U.S. government and government sponsored entities
Assets:
Bonds available for sale	0	0
Recurring Basis | Level 3 | Obligations of states, municipalities and political subdivisions
Assets:
Bonds available for sale	3	3
Other bond securities	0	0
Recurring Basis | Level 3 | Non-U.S. governments
Assets:
Bonds available for sale	7	7
Other bond securities	0	0
Recurring Basis | Level 3 | Corporate debt
Assets:
Bonds available for sale	120	240
Other bond securities	1	1
Recurring Basis | Level 3 | RMBS
Assets:
Bonds available for sale	1,626	1,894
Other bond securities	53	50
Recurring Basis | Level 3 | CMBS
Assets:
Bonds available for sale	22	26
Other bond securities	0	0
Recurring Basis | Level 3 | CLO/ABS
Assets:
Bonds available for sale	1,486	840
Other bond securities	$ 132	$ 113