Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Assets:
Bonds available for sale	$ 66,027	$ 64,006
Other bond securities	754	745
Equity securities	733	704
Derivative assets	505	624
Counterparty netting	(225)	(270)
Cash Collateral	$ (226)	$ (304)
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other assets	Other assets
Derivative assets(c)	$ 54	$ 50
Short-term investments	10,601	14,462
Liabilities:
Derivative liabilities	546	622
Counterparty netting	(225)	(270)
Cash Collateral	$ (240)	$ (201)
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Other Liabilities	Other Liabilities
Derivative liabilities	$ 81	$ 151
Fortitude Re funds withheld payable	(3,215)	(3,207)
Fair Value Using NAV Per Share (or its equivalent)	4,133	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	3,177	3,267
Obligations of states, municipalities and political subdivisions
Assets:
Bonds available for sale	3,031	3,143
Non-U.S. governments
Assets:
Bonds available for sale	6,727	8,107
Corporate debt
Assets:
Bonds available for sale	34,813	31,826
RMBS
Assets:
Bonds available for sale	9,052	8,604
CMBS
Assets:
Bonds available for sale	3,565	3,926
CLO/ABS
Assets:
Bonds available for sale	5,662	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	57	177
Level 3 | RMBS
Assets:
Bonds available for sale	1,251	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)	3,400	3,300
Recurring Basis
Assets:
Counterparty netting	(225)	(270)
Cash Collateral	(226)	(304)
Derivative assets(c)	54	50
Short-term investments	6,212	9,789
Liabilities:
Counterparty netting	(225)	(270)
Cash Collateral	(240)	(201)
Derivative liabilities	81	151
Fortitude Re funds withheld payable	(79)	(128)
Other liabilities	181	251
Recurring Basis | Levels 1, 2 and 3
Assets:
Bonds available for sale	66,027	64,006
Other bond securities	754	745
Equity securities	733	704
Other invested assets	4,279	4,092
Short-term investments	6,212	9,789
Other assets	129	129
Total	78,188	79,515
Liabilities:
Fortitude Re funds withheld payable	(79)	(128)
Other liabilities	100	100
Total	102	123
Recurring Basis | Levels 1, 2 and 3 | U.S. government and government sponsored entities
Assets:
Bonds available for sale	3,177	3,267
Recurring Basis | Levels 1, 2 and 3 | Obligations of states, municipalities and political subdivisions
Assets:
Bonds available for sale	3,031	3,143
Other bond securities	51	50
Recurring Basis | Levels 1, 2 and 3 | Non-U.S. governments
Assets:
Bonds available for sale	6,727	8,107
Other bond securities	22	24
Recurring Basis | Levels 1, 2 and 3 | Corporate debt
Assets:
Bonds available for sale	34,813	31,826
Other bond securities	284	282
Recurring Basis | Levels 1, 2 and 3 | RMBS
Assets:
Bonds available for sale	9,052	8,604
Other bond securities	100	100
Recurring Basis | Levels 1, 2 and 3 | CMBS
Assets:
Bonds available for sale	3,565	3,926
Other bond securities	42	43
Recurring Basis | Levels 1, 2 and 3 | CLO/ABS
Assets:
Bonds available for sale	5,662	5,133
Other bond securities	255	246
Recurring Basis | Level 1
Assets:
Bonds available for sale	152	197
Other bond securities	0	0
Equity securities	693	689
Other invested assets	4,018	3,810
Derivative assets	0	0
Short-term investments	3,916	7,942
Other assets	0	0
Total	8,779	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	76	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	76	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	63,153	60,799
Other bond securities	583	581
Equity securities	5	0
Other invested assets	185	119
Derivative assets	459	573
Short-term investments	2,296	1,847
Other assets	0	0
Total	66,681	63,919
Liabilities:
Derivative liabilities	500	571
Fortitude Re funds withheld payable	0	0
Other liabilities	0	0
Total	500	571
Recurring Basis | Level 2 | U.S. government and government sponsored entities
Assets:
Bonds available for sale	3,101	3,231
Recurring Basis | Level 2 | Obligations of states, municipalities and political subdivisions
Assets:
Bonds available for sale	3,028	3,140
Other bond securities	51	50
Recurring Basis | Level 2 | Non-U.S. governments
Assets:
Bonds available for sale	6,644	7,939
Other bond securities	22	24
Recurring Basis | Level 2 | Corporate debt
Assets:
Bonds available for sale	34,698	31,586
Other bond securities	283	281
Recurring Basis | Level 2 | RMBS
Assets:
Bonds available for sale	7,396	6,710
Other bond securities	50	50
Recurring Basis | Level 2 | CMBS
Assets:
Bonds available for sale	3,539	3,900
Other bond securities	42	43
Recurring Basis | Level 2 | CLO/ABS
Assets:
Bonds available for sale	4,747	4,293
Other bond securities	135	133
Recurring Basis | Level 3
Assets:
Bonds available for sale	2,722	3,010
Other bond securities	171	164
Equity securities	35	15
Other invested assets	76	163
Derivative assets	46	51
Short-term investments	0	0
Other assets	129	129
Total	3,179	3,532
Liabilities:
Derivative liabilities	46	51
Fortitude Re funds withheld payable	(79)	(128)
Other liabilities	100	100
Total	67	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	115	240
Other bond securities	1	1
Recurring Basis | Level 3 | RMBS
Assets:
Bonds available for sale	1,656	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	915	840
Other bond securities	$ 120	$ 113