FAIR VALUE MEASUREMENTS (Details - Changes in Level 3 Recurring Fair Value Measurements) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation calculation
Fair Value Beginning of Period, assets	$ 29,070	$ 33,723	$ 30,958	$ 33,610
Net Realized and Unrealized Gains (Losses) Included in Income, assets	449	400	344	717
Other Comprehensive Income (Loss), assets	1,720	412	(576)	642
Purchases, Sales, Issuances and Settlements, Net, assets	74	(860)	(745)	(1,351)
Gross Transfers In, assets	885	501	2,817	1,299
Gross Transfers Out, assets	(306)	(394)	(903)	(1,135)
Divested Businesses	(34)	0	(37)	0
Fair Value End of Period, assets	31,858	33,782	31,858	33,782
Changes in Unrealized Gains (Losses) Inlcuded in Income on Instruments Held at End of Period, assets	272	79	(60)	107
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period, assets	1,672		(429)
Liabilities
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation calculation
Fair Value Beginning of Period, liabilities	7,935	5,010	6,808	4,269
Net realized and unrealized gains (losses) included in income, liabilities	1,980	923	2,994	1,452
Other Comprehensive Income (Loss), liabilities	0	0	0	0
Purchases, Sales, Issuances and Settlements, Net, liabilities	143	197	256	409
Gross Transfers In, liabilities	0	0	0	0
Gross Transfers Out, liabilities	0	0	0	0
Divested Businesses	3,673	0	3,673	0
Fair Value End of Year, liabilities	13,731	6,130	13,731	6,130
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period, liabilities	(151)	(785)	(1,075)	(1,257)
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period, liabilities	0		0
Policyholder contract deposits
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation calculation
Fair Value Beginning of Period, liabilities	8,153	4,878	6,910	4,116
Net realized and unrealized gains (losses) included in income, liabilities	1,060	970	2,231	1,539
Other Comprehensive Income (Loss), liabilities	0	0	0	0
Purchases, Sales, Issuances and Settlements, Net, liabilities	20	217	92	410
Gross Transfers In, liabilities	0	0	0	0
Gross Transfers Out, liabilities	0	0	0	0
Divested Businesses	0	0	0	0
Fair Value End of Year, liabilities	9,233	6,065	9,233	6,065
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period, liabilities	(825)	(832)	(1,709)	(1,352)
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period, liabilities	0		0
Derivative liabilities, net
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation calculation
Fair Value Beginning of Period, liabilities	(218)	132	(102)	153
Net realized and unrealized gains (losses) included in income, liabilities	83	(47)	(74)	(87)
Other Comprehensive Income (Loss), liabilities	0	0	0	0
Purchases, Sales, Issuances and Settlements, Net, liabilities	123	(20)	164	(1)
Gross Transfers In, liabilities	0	0	0	0
Gross Transfers Out, liabilities	0	0	0	0
Divested Businesses	0	0	0	0
Fair Value End of Year, liabilities	(12)	65	(12)	65
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period, liabilities	11	47	(29)	95
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period, liabilities	0		0
Interest rate contracts
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation calculation
Fair Value Beginning of Period, liabilities	0	15	0	15
Net realized and unrealized gains (losses) included in income, liabilities	(1)	2	(1)	3
Other Comprehensive Income (Loss), liabilities	0	0	0	0
Purchases, Sales, Issuances and Settlements, Net, liabilities	1	(1)	1	(2)
Gross Transfers In, liabilities	0	0	0	0
Gross Transfers Out, liabilities	0	0	0	0
Divested Businesses	0	0	0	0
Fair Value End of Year, liabilities	0	16	0	16
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period, liabilities	0	(2)	1	(3)
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period, liabilities	0		0
Foreign exchange contracts
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation calculation
Fair Value Beginning of Period, liabilities	3	(1)	(6)	(5)
Net realized and unrealized gains (losses) included in income, liabilities	1	(5)	4	(10)
Other Comprehensive Income (Loss), liabilities	0	0	0	0
Purchases, Sales, Issuances and Settlements, Net, liabilities	(5)	2	1	11
Gross Transfers In, liabilities	0	0	0	0
Gross Transfers Out, liabilities	0	0	0	0
Divested Businesses	0	0	0	0
Fair Value End of Year, liabilities	(1)	(4)	(1)	(4)
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period, liabilities	0	4	1	4
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period, liabilities	0		0
Equity contracts
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation calculation
Fair Value Beginning of Period, liabilities	(143)	(96)	(151)	(75)
Net realized and unrealized gains (losses) included in income, liabilities	36	(4)	10	(20)
Other Comprehensive Income (Loss), liabilities	0	0	0	0
Purchases, Sales, Issuances and Settlements, Net, liabilities	54	(13)	88	(18)
Gross Transfers In, liabilities	0	0	0	0
Gross Transfers Out, liabilities	0	0	0	0
Divested Businesses	0	0	0	0
Fair Value End of Year, liabilities	(53)	(113)	(53)	(113)
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period, liabilities	(15)	4	(64)	32
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period, liabilities	0		0
Credit contracts
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation calculation
Fair Value Beginning of Period, liabilities	(76)	222	62	227
Net realized and unrealized gains (losses) included in income, liabilities	64	(24)	(60)	(27)
Other Comprehensive Income (Loss), liabilities	0	0	0	0
Purchases, Sales, Issuances and Settlements, Net, liabilities	57	(25)	43	(27)
Gross Transfers In, liabilities	0	0	0	0
Gross Transfers Out, liabilities	0	0	0	0
Divested Businesses	0	0	0	0
Fair Value End of Year, liabilities	45	173	45	173
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period, liabilities	9	23	6	27
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period, liabilities	0		0
Other contracts
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation calculation
Fair Value Beginning of Period, liabilities	(2)	(8)	(7)	(9)
Net realized and unrealized gains (losses) included in income, liabilities	(17)	(16)	(27)	(33)
Other Comprehensive Income (Loss), liabilities	0	0	0	0
Purchases, Sales, Issuances and Settlements, Net, liabilities	16	17	31	35
Gross Transfers In, liabilities	0	0	0	0
Gross Transfers Out, liabilities	0	0	0	0
Divested Businesses	0	0	0	0
Fair Value End of Year, liabilities	(3)	(7)	(3)	(7)
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period, liabilities	17	18	27	35
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period, liabilities	0		0
Fortitude Re funds withheld payable
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation calculation
Fair Value Beginning of Period, liabilities	0		0
Net realized and unrealized gains (losses) included in income, liabilities	837		837
Other Comprehensive Income (Loss), liabilities	0		0
Purchases, Sales, Issuances and Settlements, Net, liabilities	0		0
Gross Transfers In, liabilities	0		0
Gross Transfers Out, liabilities	0		0
Divested Businesses	3,673		3,673
Fair Value End of Year, liabilities	4,510		4,510
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period, liabilities	663		663
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period, liabilities	0		0
Other liabilities
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation calculation
Purchases, Sales, Issuances and Settlements, Net, liabilities	0		0
Bonds available for sale
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation calculation
Fair Value Beginning of Period, assets	24,924	27,448	25,931	27,093
Net Realized and Unrealized Gains (Losses) Included in Income, assets	214	223	308	451
Other Comprehensive Income (Loss), assets	1,720	411	(577)	641
Purchases, Sales, Issuances and Settlements, Net, assets	59	(187)	71	(444)
Gross Transfers In, assets	860	501	2,641	1,299
Gross Transfers Out, assets	(305)	(383)	(902)	(1,027)
Divested Businesses	0	0	0	0
Fair Value End of Period, assets	27,472	28,013	27,472	28,013
Changes in Unrealized Gains (Losses) Inlcuded in Income on Instruments Held at End of Period, assets	0	0	0	0
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period, assets	1,672		(429)
Bonds available for sale | Obligations of states, municipalities and political subdivisions
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation calculation
Fair Value Beginning of Period, assets	2,102	2,136	2,121	2,000
Net Realized and Unrealized Gains (Losses) Included in Income, assets	0	0	5	(1)
Other Comprehensive Income (Loss), assets	254	105	199	202
Purchases, Sales, Issuances and Settlements, Net, assets	20	62	157	86
Gross Transfers In, assets	0	6	27	35
Gross Transfers Out, assets	(97)	(147)	(230)	(160)
Divested Businesses	0	0	0	0
Fair Value End of Period, assets	2,279	2,162	2,279	2,162
Changes in Unrealized Gains (Losses) Inlcuded in Income on Instruments Held at End of Period, assets	0	0	0	0
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period, assets	244		193
Bonds available for sale | Non-U.S. governments
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation calculation
Fair Value Beginning of Period, assets	6	3	0	11
Net Realized and Unrealized Gains (Losses) Included in Income, assets	0	(1)	0	(1)
Other Comprehensive Income (Loss), assets	0	0	0	0
Purchases, Sales, Issuances and Settlements, Net, assets	5	0	5	(4)
Gross Transfers In, assets	0	0	6	0
Gross Transfers Out, assets	(6)	0	(6)	(4)
Divested Businesses	0	0	0	0
Fair Value End of Period, assets	5	2	5	2
Changes in Unrealized Gains (Losses) Inlcuded in Income on Instruments Held at End of Period, assets	0	0	0	0
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period, assets	0		0
Bonds available for sale | Corporate debt
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation calculation
Fair Value Beginning of Period, assets	1,215	1,532	1,663	864
Net Realized and Unrealized Gains (Losses) Included in Income, assets	(1)	29	(68)	26
Other Comprehensive Income (Loss), assets	72	43	(9)	81
Purchases, Sales, Issuances and Settlements, Net, assets	113	(99)	120	(65)
Gross Transfers In, assets	519	389	622	1,043
Gross Transfers Out, assets	(18)	(73)	(428)	(128)
Divested Businesses	0	0	0	0
Fair Value End of Period, assets	1,900	1,821	1,900	1,821
Changes in Unrealized Gains (Losses) Inlcuded in Income on Instruments Held at End of Period, assets	0	0	0	0
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period, assets	50		21
Bonds available for sale | Residential mortgage-backed securities (RMBS)
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation calculation
Fair Value Beginning of Period, assets	11,687	14,045	13,408	14,199
Net Realized and Unrealized Gains (Losses) Included in Income, assets	208	182	340	409
Other Comprehensive Income (Loss), assets	947	137	(676)	161
Purchases, Sales, Issuances and Settlements, Net, assets	(171)	(404)	(394)	(816)
Gross Transfers In, assets	7	44	26	67
Gross Transfers Out, assets	0	(141)	(26)	(157)
Divested Businesses	0	0	0	0
Fair Value End of Period, assets	12,678	13,863	12,678	13,863
Changes in Unrealized Gains (Losses) Inlcuded in Income on Instruments Held at End of Period, assets	0	0	0	0
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period, assets	957		(548)
Bonds available for sale | Commercial mortgage-backed securities (CMBS)
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation calculation
Fair Value Beginning of Period, assets	1,146	892	1,053	917
Net Realized and Unrealized Gains (Losses) Included in Income, assets	4	5	11	6
Other Comprehensive Income (Loss), assets	15	13	34	30
Purchases, Sales, Issuances and Settlements, Net, assets	(16)	150	28	296
Gross Transfers In, assets	0	58	23	58
Gross Transfers Out, assets	0	(15)	0	(204)
Divested Businesses	0	0	0	0
Fair Value End of Period, assets	1,149	1,103	1,149	1,103
Changes in Unrealized Gains (Losses) Inlcuded in Income on Instruments Held at End of Period, assets	0	0	0	0
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period, assets	18		39
Bonds available for sale | Collateralized Debt Obligations/Asset Backed Securities (CDO/ABS)
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation calculation
Fair Value Beginning of Period, assets	8,768	8,840	7,686	9,102
Net Realized and Unrealized Gains (Losses) Included in Income, assets	3	8	20	12
Other Comprehensive Income (Loss), assets	432	113	(125)	167
Purchases, Sales, Issuances and Settlements, Net, assets	108	104	155	59
Gross Transfers In, assets	334	4	1,937	96
Gross Transfers Out, assets	(184)	(7)	(212)	(374)
Divested Businesses	0	0	0	0
Fair Value End of Period, assets	9,461	9,062	9,461	9,062
Changes in Unrealized Gains (Losses) Inlcuded in Income on Instruments Held at End of Period, assets	0	0	0	0
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period, assets	403		(134)
Other bond securities
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation calculation
Fair Value Beginning of Period, assets	2,569	5,599	3,738	5,845
Net Realized and Unrealized Gains (Losses) Included in Income, assets	294	159	100	248
Other Comprehensive Income (Loss), assets	0	0	0	0
Purchases, Sales, Issuances and Settlements, Net, assets	(117)	(679)	(1,092)	(918)
Gross Transfers In, assets	0	0	0	0
Gross Transfers Out, assets	0	(11)	0	(107)
Divested Businesses	0	0	0	0
Fair Value End of Period, assets	2,746	5,068	2,746	5,068
Changes in Unrealized Gains (Losses) Inlcuded in Income on Instruments Held at End of Period, assets	272	58	(12)	85
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period, assets	0		0
Other bond securities | Residential mortgage-backed securities (RMBS)
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation calculation
Fair Value Beginning of Period, assets	149	1,266	143	1,290
Net Realized and Unrealized Gains (Losses) Included in Income, assets	14	43	0	60
Other Comprehensive Income (Loss), assets	0	0	0	0
Purchases, Sales, Issuances and Settlements, Net, assets	5	(479)	25	(520)
Gross Transfers In, assets	0	0	0	0
Gross Transfers Out, assets	0	0	0	0
Divested Businesses	0	0	0	0
Fair Value End of Period, assets	168	830	168	830
Changes in Unrealized Gains (Losses) Inlcuded in Income on Instruments Held at End of Period, assets	13	(19)	(1)	(19)
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period, assets	0		0
Other bond securities | Commercial mortgage-backed securities (CMBS)
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation calculation
Fair Value Beginning of Period, assets	42	84	50	77
Net Realized and Unrealized Gains (Losses) Included in Income, assets	6	0	(1)	4
Other Comprehensive Income (Loss), assets	0	0	0	0
Purchases, Sales, Issuances and Settlements, Net, assets	(1)	14	(2)	17
Gross Transfers In, assets	0	0	0	0
Gross Transfers Out, assets	0	(10)	0	(10)
Divested Businesses	0	0	0	0
Fair Value End of Period, assets	47	88	47	88
Changes in Unrealized Gains (Losses) Inlcuded in Income on Instruments Held at End of Period, assets	6	1	(2)	4
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period, assets	0		0
Other bond securities | Collateralized Debt Obligations/Asset Backed Securities (CDO/ABS)
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation calculation
Fair Value Beginning of Period, assets	2,378	4,249	3,545	4,478
Net Realized and Unrealized Gains (Losses) Included in Income, assets	274	116	101	184
Other Comprehensive Income (Loss), assets	0	0	0	0
Purchases, Sales, Issuances and Settlements, Net, assets	(121)	(214)	(1,115)	(415)
Gross Transfers In, assets	0	0	0	0
Gross Transfers Out, assets	0	(1)	0	(97)
Divested Businesses	0	0	0	0
Fair Value End of Period, assets	2,531	4,150	2,531	4,150
Changes in Unrealized Gains (Losses) Inlcuded in Income on Instruments Held at End of Period, assets	253	76	(9)	100
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period, assets	0		0
Equity securities
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation calculation
Fair Value Beginning of Period, assets	19	26	8	27
Net Realized and Unrealized Gains (Losses) Included in Income, assets	0	0	(1)	0
Other Comprehensive Income (Loss), assets	0	0	1	0
Purchases, Sales, Issuances and Settlements, Net, assets	0	9	10	9
Gross Transfers In, assets	25	0	26	0
Gross Transfers Out, assets	(1)	0	(1)	(1)
Divested Businesses	0	0	0	0
Fair Value End of Period, assets	43	35	43	35
Changes in Unrealized Gains (Losses) Inlcuded in Income on Instruments Held at End of Period, assets	0	3	0	3
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period, assets	0		0
Other invested assets
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation calculation
Fair Value Beginning of Period, assets	1,467	591	1,192	587
Net Realized and Unrealized Gains (Losses) Included in Income, assets	(59)	18	(63)	18
Other Comprehensive Income (Loss), assets	0	1	0	1
Purchases, Sales, Issuances and Settlements, Net, assets	78	(5)	207	(1)
Gross Transfers In, assets	0	0	150	0
Gross Transfers Out, assets	0	0	0	0
Divested Businesses	0	0	0	0
Fair Value End of Period, assets	1,486	605	1,486	605
Changes in Unrealized Gains (Losses) Inlcuded in Income on Instruments Held at End of Period, assets	0	18	(48)	19
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period, assets	0		0
Other assets
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation calculation
Fair Value Beginning of Period, assets	91	59	89	58
Net Realized and Unrealized Gains (Losses) Included in Income, assets	0	0	0	0
Other Comprehensive Income (Loss), assets	0	0	0	0
Purchases, Sales, Issuances and Settlements, Net, assets	54	2	59	3
Gross Transfers In, assets	0	0	0	0
Gross Transfers Out, assets	0	0	0	0
Divested Businesses	(34)	0	(37)	0
Fair Value End of Period, assets	111	61	111	61
Changes in Unrealized Gains (Losses) Inlcuded in Income on Instruments Held at End of Period, assets	0	$ 0	0	$ 0
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period, assets	$ 0		$ 0