REINSURANCE (Details - Summary of the impact of modco and funds withheld) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Effects of Reinsurance [Line Items]
Net underwriting income		$ (1,024)	$ 89	$ (3,137)
Net investment income		13,631	14,619	13,086
Net realized capital gains (losses)		(2,238)	632	(51)
Loss from continuing operations before income tax benefit		(7,293)	5,287	257
Income tax benefit		(1,460)	1,166	154
Net loss		$ (5,829)	$ 4,169	$ 61
U.S. federal income tax at statutory rate (as a percent)		21.00%	21.00%	21.00%
Fortitude Re funds withheld assets
Effects of Reinsurance [Line Items]
Net investment income	[1]	$ 1,053	$ 0	$ 0
Net realized capital gains (losses)	[1]	463	$ 0	$ 0
Fortitude Holdings
Effects of Reinsurance [Line Items]
Net underwriting income		0
Net investment income		1,053
Net realized capital gains (losses)		(2,182)
Loss from continuing operations before income tax benefit		(1,129)
Income tax benefit		(237)
Net loss		(892)
Change in net unrealized gains (losses) on real estate investments		812
Total economic impact to AIG		(80)
Fortitude Holdings | Fortitude Re funds withheld assets
Effects of Reinsurance [Line Items]
Net realized capital gains (losses)		463
Fortitude Holdings | Fortitude Re funds withheld assets | Embedded derivatives
Effects of Reinsurance [Line Items]
Net realized capital gains (losses)		$ (2,645)

[1] Represents activity subsequent to the deconsolidation of Fortitude Reinsurance Company Ltd. on June 2, 2020.