Segment Information - Schedule of Continuing Operations by Operating Segment (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Segment Reporting Information [Line Items]
Adjusted Revenues	$ 6,560	$ 7,436	$ 13,323	$ 14,145
Adjusted Pre-tax Income (Loss)	617	886	1,675	1,288
Changes in the fair values of equity securities and AIG's investment in Corebridge	59	41	147	62
Other income (expense) - net	15	8	17	23
Gain (loss) on extinguishment of debt	(1)	0	(1)	0
Net Investment Income	990	837	1,969	1,681
Net realized gains (losses)	(180)	(14)	(267)	(525)
Net realized losses, adjusted revenues	(188)	(67)	(240)	(386)
Net realized losses, adjusted pre-tax income (loss)	(186)	(64)	(241)	(383)
Net gain (loss) on divestitures and other	102	(15)	102	(12)
Non-operating litigation reserves and settlements, adjustment to revenue	0	0	0	1
Non-operating litigation reserves and settlements, pre-tax income (loss)	0	(1)	0	0
Favorable prior year development and related amortization changes ceded under retroactive reinsurance agreements	62	18	60	37
Net loss reserve discount charge	(26)	(16)	(102)	(80)
Pension expense related to lump sum payments to former employees	0	(54)		(54)
Integration and transaction costs associated with acquiring or divesting businesses	(18)	(8)	(15)	(8)
Restructuring and other costs	(426)	(125)	(493)	(215)
Non-recurring costs related to regulatory or accounting changes	(7)	(7)	(11)	(15)
Net impact from elimination of international reporting lag, adjusted revenues				4
Net impact from elimination of international reporting lag, adjusted pre-tax income (loss)				12
Fortitude Re funds withheld assets
Segment Reporting Information [Line Items]
Net Investment Income	33	25	72	77
Net realized gains (losses)	(1)	(7)	(20)	(61)
Fortitude Re funds withheld embedded derivative
Segment Reporting Information [Line Items]
Net realized gains (losses)	8	58	(1)	(82)
Total
Segment Reporting Information [Line Items]
Adjusted Revenues	6,634	7,378	13,348	14,507
Adjusted Pre-tax Income (Loss)	1,018	1,041	2,178	2,010
Corporate Reconciling Items And Eliminations
Segment Reporting Information [Line Items]
Adjusted Revenues	139	156	305	280
Adjusted Pre-tax Income (Loss)	(158)	(278)	(356)	(557)
Other Operations before consolidation and eliminations
Segment Reporting Information [Line Items]
Adjusted Revenues	144	173	308	319
Adjusted Pre-tax Income (Loss)	(158)	(270)	(355)	(544)
Consolidation and eliminations
Segment Reporting Information [Line Items]
Adjusted Revenues	(5)	(17)	(3)	(39)
Adjusted Pre-tax Income (Loss)	0	(8)	(1)	(13)
General Insurance | Net investment income
Segment Reporting Information [Line Items]
Adjusted Revenues	746	725
Adjusted Pre-tax Income (Loss)	746	725
General Insurance | Reportable Segments
Segment Reporting Information [Line Items]
Adjusted Revenues	6,495	7,222	13,043	14,227
Adjusted Pre-tax Income (Loss)	1,176	1,319	2,534	2,567
General Insurance | Reportable Segments | North America
Segment Reporting Information [Line Items]
Adjusted Revenues	2,470	3,195	4,972	6,175
Adjusted Pre-tax Income (Loss)	163	352	387	651
General Insurance | Reportable Segments | International
Segment Reporting Information [Line Items]
Adjusted Revenues	3,279	3,302	6,563	6,581
Adjusted Pre-tax Income (Loss)	$ 267	$ 242	639	445
General Insurance | Reportable Segments | Net investment income
Segment Reporting Information [Line Items]
Adjusted Revenues			1,508	1,471
Adjusted Pre-tax Income (Loss)			$ 1,508	$ 1,471