QUARTERLY FINANCIAL INFORMATION (UNAUDITED) (Details - Consolidated Statements of Income (Loss)) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
QUARTERLY FINANCIAL INFORMATION (UNAUDITED)
Total revenues	$ 12,635	$ 11,751	$ 12,502	$ 12,632	$ 13,010	$ 12,854	$ 14,724	$ 11,779	$ 49,520	$ 52,367	$ 58,327
Income (loss) from continuing operations before income tax expense (benefit)	875	(2,803)	1,667	1,727	(3,455)	737	2,858	(214)	1,466	(74)	3,281
Income (loss) from discontinued operations, net of income tax expense	(3)	(1)	8	0	(36)	3	(10)	(47)	4	(90)	0
Net income (loss)	(6,672)	(1,713)	1,118	1,211	(2,506)	436	1,924	(203)	(6,056)	(349)	2,222
Net income (loss) from continuing operations attributable to noncontrolling interests	(12)	26	(12)	26	535	(26)	11	(20)	28	500	26
Net income (loss) attributable to AIG	$ (6,660)	$ (1,739)	$ 1,130	$ 1,185	$ (3,041)	$ 462	$ 1,913	$ (183)	$ (6,084)	$ (849)	$ 2,196
Basic:
Income (loss) from continuing operations	$ (7.33)	$ (1.91)	$ 1.21	$ 1.21	$ (2.93)	$ 0.43	$ 1.73	$ (0.12)	$ (6.54)	$ (0.7)	$ 1.69
Income (loss) from discontinued operations	0	0	0.01	0	(0.03)	0	(0.01)	(0.04)	0	(0.08)	0
Diluted:
Income (loss) from continuing operations	(7.33)	(1.91)	1.18	1.18	(2.93)	0.42	1.69	(0.12)	(6.54)	(0.7)	1.65
Income (loss) from discontinued operations	$ 0	$ 0	$ 0.01	$ 0	$ (0.03)	$ 0	$ (0.01)	$ (0.04)	$ 0	$ (0.08)	$ 0
Weighted average shares outstanding:
Basic	908,115,499	908,667,044	925,751,084	980,777,243	1,023,886,592	1,071,295,892	1,113,587,927	1,156,548,459	930,561,286	1,091,085,131	1,299,825,350
Diluted	908,115,499	908,667,044	948,248,771	1,005,315,030	1,023,886,592	1,102,400,770	1,140,045,973	1,156,548,459	930,561,286	1,091,085,131	1,334,464,883
Noteworthy quarterly items income (expense):
Other-than-temporary impairments	$ 37	$ 88	$ 67	$ 68	$ 145	$ 102	$ 108	$ 204	$ 227	$ 487	$ 591
Income (loss) from divested businesses	(241)	13	60	100	(194)	(128)	(225)	2	68	545	(11)
Federal and foreign valuation allowance for deferred tax assets	40	24	(8)	(13)	87	(2)	35	(37)
Gain (Loss) on extinguishment of debt	(1)	1	(4)	(1)	(2)	(14)	7	83	5	(74)	(756)
Total prior year (favourable) unfavorable development	212	901	391	61	5,574	273	7	(66)
Restructuring and other costs	154	$ 31	$ 47	$ 181	206	210	90	188
Impact of Tax Act	$ 6,687								$ 6,687	0	0
Adjustment
QUARTERLY FINANCIAL INFORMATION (UNAUDITED)
Income (loss) from continuing operations before income tax expense (benefit)					(12)
Net income (loss) attributable to AIG					(154)
Adjusted Pre-Tax Income (Loss)					$ (1)
Adjustments 2016 [Member]
QUARTERLY FINANCIAL INFORMATION (UNAUDITED)
Income (loss) from continuing operations before income tax expense (benefit)										(57)
Net income (loss) attributable to AIG						$ (65)	$ 66	$ 19		(174)	$ (67)	$ (12)
Adjusted Pre-Tax Income (Loss)										$ (6)