Earnings Per Common Share (EPS) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Numerator for EPS:
Income (loss) from continuing operations	$ (87)	$ 4,560
Less: Net income (loss) from continuing operations attributable to noncontrolling interests	(117)	387
Less: Preferred stock dividends	7	7
Income (loss) attributable to AIG common shareholders from continuing operations	23	4,166
Income from discontinued operations, net of income tax expense	0	0
Net income (loss) attributable to AIG common shareholders	$ 23	$ 4,166
Denominator for EPS:
Weighted average common shares outstanding - basic (in shares)	738,661,428	816,314,273
Dilutive common shares (in shares)	5,437,758	9,698,337
Weighted average common shares outstanding - diluted (in shares)	744,099,186	826,012,610
Basic:
Income (loss) from continuing operations (in dollars per share)	$ 0.03	$ 5.10
Income from discontinued operations (in dollars per share)	0	0
Income (loss) attributable to AIG common shareholders (in dollars per share)	0.03	5.10
Diluted:
Income (loss) from continuing operations (in dollars per share)	0.03	5.04
Income from discontinued operations (in dollars per share)	0	0
Net income attributable to AIG common shareholders (in dollars per share)	$ 0.03	$ 5.04
Number of shares excluded from diluted shares outstanding because the effect would have been anti-dilutive (in shares)	4,500,000	39,900,000