Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Assets:
Bonds available for sale	$ 68,860	$ 64,006
Other bond securities	722	745
Equity securities	775	704
Derivative assets	423	624
Counterparty netting	(207)	(270)
Cash Collateral	$ (199)	$ (304)
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other assets	Other assets
Derivative assets	$ 17	$ 50
Short-term investments	10,102	14,462
Liabilities:
Derivative liabilities	529	622
Counterparty netting	(207)	(270)
Cash Collateral	$ (264)	$ (201)
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Other Liabilities	Other Liabilities
Derivative liabilities	$ 58	$ 151
Fortitude Re funds withheld payable	(3,109)	(3,207)
Fair Value Using NAV Per Share (or its equivalent)	4,151	4,032
Corebridge Financial Inc
Liabilities:
Corebridge retained investment	4,000	3,800
U.S. government and government sponsored entities
Assets:
Bonds available for sale	2,909	3,267
Obligations of states, municipalities and political subdivisions
Assets:
Bonds available for sale	3,023	3,143
Non-U.S. governments
Assets:
Bonds available for sale	6,913	8,107
Corporate debt
Assets:
Bonds available for sale	36,485	31,826
RMBS
Assets:
Bonds available for sale	9,717	8,604
CMBS
Assets:
Bonds available for sale	3,743	3,926
CLO/ABS
Assets:
Bonds available for sale	6,070	5,133
Level 3 | Obligations of states, municipalities and political subdivisions
Assets:
Bonds available for sale	2	3
Level 3 | Corporate debt
Assets:
Bonds available for sale	38	177
Level 3 | RMBS
Assets:
Bonds available for sale	1,242	1,321
Level 3 | CMBS
Assets:
Bonds available for sale	22	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	(207)	(270)
Cash Collateral	(199)	(304)
Derivative assets	17	50
Short-term investments	5,356	9,789
Liabilities:
Counterparty netting	(207)	(270)
Cash Collateral	(264)	(201)
Derivative liabilities	58	151
Fortitude Re funds withheld payable	(185)	(128)
Other liabilities	139	251
Recurring Basis | Levels 1, 2 and 3
Assets:
Bonds available for sale	68,860	64,006
Other bond securities	722	745
Equity securities	775	704
Other invested assets	4,309	4,092
Short-term investments	5,356	9,789
Other assets	129	129
Total	80,168	79,515
Liabilities:
Fortitude Re funds withheld payable	(185)	(128)
Other liabilities	81	100
Total	(46)	123
Recurring Basis | Levels 1, 2 and 3 | U.S. government and government sponsored entities
Assets:
Bonds available for sale	2,909	3,267
Recurring Basis | Levels 1, 2 and 3 | Obligations of states, municipalities and political subdivisions
Assets:
Bonds available for sale	3,023	3,143
Other bond securities	50	50
Recurring Basis | Levels 1, 2 and 3 | Non-U.S. governments
Assets:
Bonds available for sale	6,913	8,107
Other bond securities	23	24
Recurring Basis | Levels 1, 2 and 3 | Corporate debt
Assets:
Bonds available for sale	36,485	31,826
Other bond securities	260	282
Recurring Basis | Levels 1, 2 and 3 | RMBS
Assets:
Bonds available for sale	9,717	8,604
Other bond securities	98	100
Recurring Basis | Levels 1, 2 and 3 | CMBS
Assets:
Bonds available for sale	3,743	3,926
Other bond securities	43	43
Recurring Basis | Levels 1, 2 and 3 | CLO/ABS
Assets:
Bonds available for sale	6,070	5,133
Other bond securities	248	246
Recurring Basis | Level 1
Assets:
Bonds available for sale	141	197
Other bond securities	0	0
Equity securities	729	689
Other invested assets	4,043	3,810
Derivative assets	0	0
Short-term investments	3,439	7,942
Other assets	0	0
Total	8,352	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	77	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	64	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	65,704	60,799
Other bond securities	548	581
Equity securities	0	0
Other invested assets	173	119
Derivative assets	383	573
Short-term investments	1,917	1,847
Other assets	0	0
Total	68,725	63,919
Liabilities:
Derivative liabilities	489	571
Fortitude Re funds withheld payable	0	0
Other liabilities	0	0
Total	489	571
Recurring Basis | Level 2 | U.S. government and government sponsored entities
Assets:
Bonds available for sale	2,832	3,231
Recurring Basis | Level 2 | Obligations of states, municipalities and political subdivisions
Assets:
Bonds available for sale	3,020	3,140
Other bond securities	50	50
Recurring Basis | Level 2 | Non-U.S. governments
Assets:
Bonds available for sale	6,843	7,939
Other bond securities	23	24
Recurring Basis | Level 2 | Corporate debt
Assets:
Bonds available for sale	36,338	31,586
Other bond securities	259	281
Recurring Basis | Level 2 | RMBS
Assets:
Bonds available for sale	8,084	6,710
Other bond securities	48	50
Recurring Basis | Level 2 | CMBS
Assets:
Bonds available for sale	3,717	3,900
Other bond securities	43	43
Recurring Basis | Level 2 | CLO/ABS
Assets:
Bonds available for sale	4,870	4,293
Other bond securities	125	133
Recurring Basis | Level 3
Assets:
Bonds available for sale	3,015	3,010
Other bond securities	174	164
Equity securities	46	15
Other invested assets	93	163
Derivative assets	40	51
Short-term investments	0	0
Other assets	129	129
Total	3,497	3,532
Liabilities:
Derivative liabilities	40	51
Fortitude Re funds withheld payable	(185)	(128)
Other liabilities	81	100
Total	(64)	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	6	7
Other bond securities	0	0
Recurring Basis | Level 3 | Corporate debt
Assets:
Bonds available for sale	147	240
Other bond securities	1	1
Recurring Basis | Level 3 | RMBS
Assets:
Bonds available for sale	1,633	1,894
Other bond securities	50	50
Recurring Basis | Level 3 | CMBS
Assets:
Bonds available for sale	26	26
Other bond securities	0	0
Recurring Basis | Level 3 | CLO/ABS
Assets:
Bonds available for sale	1,200	840
Other bond securities	$ 123	$ 113