INVESTMENTS (Details - Summary of fair value and gross unrealized losses on available for sale securities aggregated by major investment category and length of time in a continuous unrealized loss position) $ in Millions	Mar. 31, 2018 USD ($) item	Dec. 31, 2017 USD ($)
Fair value and gross unrealized losses on AIG's available for sale securities
Fair Value, Less than 12 Months	$ 63,952	$ 31,657
Gross Unrealized Losses, Less than 12 Months	1,824	726
Fair Value, 12 Months or More	14,249	15,127
Gross Unrealized Losses, 12 Months or More	973	655
Fair Value, Total	78,201	46,784
Gross Unrealized Losses, Total	2,797	1,381
Bonds available for sale
Fair value and gross unrealized losses on AIG's available for sale securities
Fair Value, Less than 12 Months	63,952	31,520
Gross Unrealized Losses, Less than 12 Months	1,824	705
Fair Value, 12 Months or More	14,249	15,127
Gross Unrealized Losses, 12 Months or More	973	655
Fair Value, Total	78,201	46,647
Gross Unrealized Losses, Total	$ 2,797	1,360
Number of securities in an unrealized loss position | item	12,137
Number of individual securities in continuous unrealized loss position for longer than twelve months | item	2,015
Bonds available for sale | U.S. government and government sponsored entities
Fair value and gross unrealized losses on AIG's available for sale securities
Fair Value, Less than 12 Months	$ 1,097	770
Gross Unrealized Losses, Less than 12 Months	25	23
Fair Value, 12 Months or More	529	332
Gross Unrealized Losses, 12 Months or More	27	13
Fair Value, Total	1,626	1,102
Gross Unrealized Losses, Total	52	36
Bonds available for sale | Obligations of states, municipalities and political subdivisions
Fair value and gross unrealized losses on AIG's available for sale securities
Fair Value, Less than 12 Months	2,010	586
Gross Unrealized Losses, Less than 12 Months	36	6
Fair Value, 12 Months or More	599	646
Gross Unrealized Losses, 12 Months or More	37	24
Fair Value, Total	2,609	1,232
Gross Unrealized Losses, Total	73	30
Bonds available for sale | Non-U.S. governments
Fair value and gross unrealized losses on AIG's available for sale securities
Fair Value, Less than 12 Months	5,825	3,511
Gross Unrealized Losses, Less than 12 Months	127	54
Fair Value, 12 Months or More	893	857
Gross Unrealized Losses, 12 Months or More	70	63
Fair Value, Total	6,718	4,368
Gross Unrealized Losses, Total	197	117
Bonds available for sale | Corporate debt
Fair value and gross unrealized losses on AIG's available for sale securities
Fair Value, Less than 12 Months	38,072	15,578
Gross Unrealized Losses, Less than 12 Months	1,263	453
Fair Value, 12 Months or More	6,701	7,291
Gross Unrealized Losses, 12 Months or More	524	347
Fair Value, Total	44,773	22,869
Gross Unrealized Losses, Total	1,787	800
Bonds available for sale | Residential mortgage-backed securities (RMBS)
Fair value and gross unrealized losses on AIG's available for sale securities
Fair Value, Less than 12 Months	7,716	6,212
Gross Unrealized Losses, Less than 12 Months	206	99
Fair Value, 12 Months or More	3,349	3,790
Gross Unrealized Losses, 12 Months or More	186	121
Fair Value, Total	11,065	10,002
Gross Unrealized Losses, Total	392	220
Bonds available for sale | Commercial mortgage-backed securities (CMBS)
Fair value and gross unrealized losses on AIG's available for sale securities
Fair Value, Less than 12 Months	6,105	3,408
Gross Unrealized Losses, Less than 12 Months	133	46
Fair Value, 12 Months or More	1,347	1,389
Gross Unrealized Losses, 12 Months or More	89	59
Fair Value, Total	7,452	4,797
Gross Unrealized Losses, Total	222	105
Bonds available for sale | Collateralized Debt Obligations/Asset-Backed Securities (CDO/ABS)
Fair value and gross unrealized losses on AIG's available for sale securities
Fair Value, Less than 12 Months	3,127	1,455
Gross Unrealized Losses, Less than 12 Months	34	24
Fair Value, 12 Months or More	831	822
Gross Unrealized Losses, 12 Months or More	40	28
Fair Value, Total	3,958	2,277
Gross Unrealized Losses, Total	74	52
Equity securities available for sale
Fair value and gross unrealized losses on AIG's available for sale securities
Fair Value, Less than 12 Months	0	137
Gross Unrealized Losses, Less than 12 Months	0	21
Fair Value, 12 Months or More	0
Gross Unrealized Losses, 12 Months or More	0
Fair Value, Total	0	137
Gross Unrealized Losses, Total	$ 0	21
Number of individual securities in continuous unrealized loss position for longer than twelve months | item	0
Equity securities available for sale | Common Stock
Fair value and gross unrealized losses on AIG's available for sale securities
Fair Value, Less than 12 Months	$ 0	136
Gross Unrealized Losses, Less than 12 Months	0	21
Fair Value, 12 Months or More	0
Gross Unrealized Losses, 12 Months or More	0
Fair Value, Total	0	136
Gross Unrealized Losses, Total	0	21
Equity securities available for sale | Mutual Funds
Fair value and gross unrealized losses on AIG's available for sale securities
Fair Value, Less than 12 Months	0	1
Gross Unrealized Losses, Less than 12 Months	0	0
Fair Value, 12 Months or More	0
Gross Unrealized Losses, 12 Months or More	0
Fair Value, Total	0	1
Gross Unrealized Losses, Total	$ 0	$ 0