Earnings Per Common Share (EPS) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Jan. 31, 2011
Numerator for EPS:
Income from continuing operations	$ 3,041,000,000	$ 1,737,000,000	$ 11,090,000,000	$ 5,817,000,000
Less: Net income from continuing operations attributable to noncontrolling interests	332,000,000	70,000,000	1,084,000,000	175,000,000
Less: Preferred stock dividends	7,000,000	7,000,000	22,000,000	22,000,000
Income attributable to AIG common shareholders from continuing operations	2,702,000,000	1,660,000,000	9,984,000,000	5,620,000,000
Income (loss) from discontinued operations, net of income tax expense	0	0	(1,000,000)	0
Net income attributable to AIG common shareholders	$ 2,702,000,000	$ 1,660,000,000	$ 9,983,000,000	$ 5,620,000,000
Denominator for EPS:
Weighted average common shares outstanding - basic (in shares)	763,051,482	852,765,263	789,888,322	861,211,983
Dilutive common shares (in shares)	8,080,919	11,254,231	9,204,234	9,790,035
Weighted average common shares outstanding - diluted (in shares)	771,132,401	864,019,494	799,092,556	871,002,018
Basic:
Income from continuing operations (in dollars per share)	$ 3.54	$ 1.95	$ 12.64	$ 6.53
Income from discontinued operations (in dollars per share)	0	0	0	0
Net income attributable to AIG common shareholders (in dollars per share)	3.54	1.95	12.64	6.53
Diluted:
Income from continuing operations (in dollars per share)	3.50	1.92	12.49	6.45
Income from discontinued operations (in dollars per share)	0	0	0	0
Net income attributable to AIG common shareholders (in dollars per share)	$ 3.50	$ 1.92	$ 12.49	$ 6.45
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)	6,000,000	5,200,000	30,800,000	6,600,000