Quarterly Financial Information (Unaudited) (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
Quarterly Financial Information Disclosure [Abstract]
Total revenues	$ 7,177	$ 6,751	$ 6,560	$ 6,763	$ 6,526	$ 7,267	$ 7,436	$ 6,709	$ 27,251	$ 27,938	$ 29,996
Net income from continuing operations	947	481	475	797	862	701	841	337	2,700	2,741	2,890
Income (loss) from discontinued operations, net of income taxes	(46)	(24)	(4,359)	803	(1,335)	2,046	850	(424)
Net income (loss)	901	457	(3,884)	1,600	(473)	2,747	1,691	(87)	(926)	3,878	11,273
Net income (loss) attributable to AIG	898	459	(3,977)	1,216	93	2,027	1,493	30	(1,404)	3,643	10,227
Net income attributable to AIG common shareholders	$ 898	$ 459	$ (3,977)	$ 1,194	$ 86	$ 2,020	$ 1,485	$ 23	$ (1,426)	$ 3,614	$ 10,198
Basic:
Income 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
Diluted:
Income 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
Weighted average 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
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