Earnings Per Common Share (EPS) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Numerator for EPS:
Income (loss) from continuing operations	$ 947	$ 481	$ 475	$ 797	$ 862	$ 701	$ 841	$ 337	$ 2,700	$ 2,741	$ 2,890
Less: Preferred stock dividends and preferred stock redemption premiums									22	29	29
Income (loss) attributable to AIG common shareholders from continuing operations									2,678	2,712	2,861
Income (loss) from discontinued operations, net of income tax expense									(3,626)	1,137	8,383
Less: Net income attributable to noncontrolling interests									478	235	1,046
Net income (loss) from discontinued operations attributable to AIG									(4,104)	902	7,337
Net income (loss) attributable to AIG common shareholders	$ 898	$ 459	$ (3,977)	$ 1,194	$ 86	$ 2,020	$ 1,485	$ 23	$ (1,426)	$ 3,614	$ 10,198
Denominator for EPS:
Weighted average common shares outstanding - basic (in shares)	620,940,268	641,621,768	661,092,967	682,576,848	701,485,716	712,598,496	725,754,549	738,661,428	651,448,307	719,506,291	778,621,118
Dilutive common shares (in shares)									5,834,853	5,726,777	9,320,632
Weighted average common shares outstanding - diluted (in shares)	627,289,135	647,365,442	666,955,168	687,961,518	708,033,686	718,727,312	730,547,112	744,099,186	657,283,160	725,233,068	787,941,750
Basic:
Income (loss) from continuing operations (in dollars per share)	$ 1.53	$ 0.75	$ 0.72	$ 1.14	$ 1.22	$ 0.97	$ 1.15	$ 0.45	$ 4.11	$ 3.77	$ 3.67
Income (loss) from discontinued operations (in dollars per share)	(0.08)	(0.03)	(6.74)	0.61	(1.10)	1.86	0.90	(0.42)	(6.30)	1.25	9.43
Net income (loss) attributable to AIG common shareholders (in dollars per share)									(2.19)	5.02	13.10
Diluted:
Income (loss) from continuing operations (in dollars per share)	1.51	0.74	0.71	1.13	1.21	0.97	1.14	0.44	4.07	3.74	3.63
Income (loss) from discontinued operations (in dollars per share)	$ (0.08)	$ (0.03)	$ (6.67)	$ 0.61	$ (1.09)	$ 1.84	$ 0.89	$ (0.41)	(6.24)	1.24	9.31
Net income (loss) attributable to AIG common shareholders (in dollars per share)									$ (2.17)	$ 4.98	$ 12.94
Number of shares excluded from diluted shares outstanding because the effect would have been anti-dilutive (in shares)									100,000	4,400,000	24,100,000