Earnings Per Common Share (EPS) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Jan. 31, 2011
Numerator for EPS:
Income from continuing operations	$ 3,393,000,000	$ 150,000,000	$ 8,049,000,000	$ 4,080,000,000
Less: Net income from continuing operations attributable to noncontrolling interests	356,000,000	51,000,000	752,000,000	105,000,000
Less: Preferred stock dividends	8,000,000	8,000,000	15,000,000	15,000,000
Income attributable to AIG common shareholders from continuing operations	3,029,000,000	91,000,000	7,282,000,000	3,960,000,000
Loss from discontinued operations, net of income tax expense	(1,000,000)	0	(1,000,000)	0
Net income attributable to AIG common shareholders	$ 3,028,000,000	$ 91,000,000	$ 7,281,000,000	$ 3,960,000,000
Denominator for EPS:
Weighted average common shares outstanding - basic (in shares)	790,897,301	862,930,931	803,532,447	865,508,343
Dilutive common shares (in shares)	9,833,445	9,946,372	9,765,891	9,057,937
Weighted average common shares outstanding - diluted (in shares)	800,730,746	872,877,303	813,298,338	874,566,280
Basic:
Income from continuing operations (in dollars per share)	$ 3.83	$ 0.11	$ 9.06	$ 4.58
Income from discontinued operations (in dollars per share)	0	0	0	0
Net income attributable to AIG common shareholders (in dollars per share)	3.83	0.11	9.06	4.58
Diluted:
Income from continuing operations (in dollars per share)	3.78	0.11	8.95	4.53
Income from discontinued operations (in dollars per share)	0	0	0	0
Net income attributable to AIG common shareholders (in dollars per share)	$ 3.78	$ 0.11	$ 8.95	$ 4.53
Warrants outstanding, term (in years)					10 years
Number of shares excluded from diluted shares outstanding because the effect would have been anti-dilutive (in shares)	46,600,000	5,500,000	46,200,000	7,400,000