FAIR VALUE MEASUREMENTS (Details - Changes in Level 3 Recurring Fair Value Measurements) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation calculation
Fair Value Beginning of Period, assets	$ 31,298	$ 29,070	$ 31,578	$ 30,958
Net Realized and Unrealized Gains (Losses) Included in Income, assets	335	449	673	344
Other Comprehensive Income (Loss), assets	168	1,720	(10)	(576)
Purchases, Sales, Issuances and Settlements, Net, assets	(931)	74	(1,483)	(745)
Gross Transfers In, assets	597	885	1,376	2,817
Gross Transfers Out, assets	(606)	(306)	(1,273)	(903)
Divested Businesses	0	(34)	0	(37)
Fair Value End of Period, assets	30,861	31,858	30,861	31,858
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period, assets	393	272	421	(60)
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period, assets	1,672	1,672	1,497	(429)
Liabilities
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation calculation
Fair Value Beginning of Period, liabilities	10,917	7,935	15,721	6,808
Net realized and unrealized gains (losses) included in income, liabilities	3,332	1,980	(1,347)	2,994
Other Comprehensive Income (Loss), liabilities	0	0	0	0
Purchases, Sales, Issuances and Settlements, Net, liabilities	(243)	143	(408)	256
Gross Transfers In, liabilities	0	0	0	0
Gross Transfers Out, liabilities	5	0	45	0
Divested Businesses	0	3,673	0	3,673
Fair Value End of Year, liabilities	14,011	13,731	14,011	13,731
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period, liabilities	(2,369)	(151)	3,102	(1,075)
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period, liabilities	0	0	0	0
Policyholder contract deposits
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation calculation
Fair Value Beginning of Period, liabilities	7,617	8,153	9,798	6,910
Net realized and unrealized gains (losses) included in income, liabilities	1,363	1,060	(897)	2,231
Other Comprehensive Income (Loss), liabilities	0	0	0	0
Purchases, Sales, Issuances and Settlements, Net, liabilities	40	20	119	92
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	9,020	9,233	9,020	9,233
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period, liabilities	(1,018)	(825)	1,553	(1,709)
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period, liabilities	0	0	0	0
Derivative liabilities, net
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation calculation
Fair Value Beginning of Period, liabilities	(187)	(218)	(119)	(102)
Net realized and unrealized gains (losses) included in income, liabilities	(87)	83	(124)	(74)
Other Comprehensive Income (Loss), liabilities	0	0	0	0
Purchases, Sales, Issuances and Settlements, Net, liabilities	(57)	123	(128)	164
Gross Transfers In, liabilities	0	0	0	0
Gross Transfers Out, liabilities	5	0	45	0
Divested Businesses	0	0	0	0
Fair Value End of Year, liabilities	(326)	(12)	(326)	(12)
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period, liabilities	101	11	46	(29)
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period, liabilities	0	0	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	0	0	0
Net realized and unrealized gains (losses) included in income, liabilities	(2)	(1)	(2)	(1)
Other Comprehensive Income (Loss), liabilities	0	0	0	0
Purchases, Sales, Issuances and Settlements, Net, liabilities	1	1	1	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	(1)	0	(1)	0
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period, liabilities	1	0	2	1
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period, liabilities	0	0	0	0
Foreign exchange contracts
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation calculation
Fair Value Beginning of Period, liabilities	0	3	(2)	(6)
Net realized and unrealized gains (losses) included in income, liabilities	0	1	1	4
Other Comprehensive Income (Loss), liabilities	0	0	0	0
Purchases, Sales, Issuances and Settlements, Net, liabilities	(1)	(5)	0	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	(1)	(1)	(1)	(1)
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period, liabilities	(1)	0	(1)	1
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period, liabilities	0	0	0	0
Equity contracts
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation calculation
Fair Value Beginning of Period, liabilities	(222)	(143)	(151)	(151)
Net realized and unrealized gains (losses) included in income, liabilities	(71)	36	(97)	10
Other Comprehensive Income (Loss), liabilities	0	0	0	0
Purchases, Sales, Issuances and Settlements, Net, liabilities	(69)	54	(154)	88
Gross Transfers In, liabilities	0	0	0	0
Gross Transfers Out, liabilities	5	0	45	0
Divested Businesses	0	0	0	0
Fair Value End of Year, liabilities	(357)	(53)	(357)	(53)
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period, liabilities	85	(15)	13	(64)
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period, liabilities	0	0	0	0
Credit contracts
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation calculation
Fair Value Beginning of Period, liabilities	44	(76)	42	62
Net realized and unrealized gains (losses) included in income, liabilities	2	64	7	(60)
Other Comprehensive Income (Loss), liabilities	0	0	0	0
Purchases, Sales, Issuances and Settlements, Net, liabilities	(3)	57	(6)	43
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	43	45	43	45
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period, liabilities	(1)	9	(1)	6
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period, liabilities	0	0	0	0
Other contracts
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation calculation
Fair Value Beginning of Period, liabilities	(9)	(2)	(8)	(7)
Net realized and unrealized gains (losses) included in income, liabilities	(16)	(17)	(33)	(27)
Other Comprehensive Income (Loss), liabilities	0	0	0	0
Purchases, Sales, Issuances and Settlements, Net, liabilities	15	16	31	31
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	(10)	(3)	(10)	(3)
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period, liabilities	17	17	33	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	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	3,487	0	6,042	0
Net realized and unrealized gains (losses) included in income, liabilities	2,056	837	(326)	837
Other Comprehensive Income (Loss), liabilities	0	0	0	0
Purchases, Sales, Issuances and Settlements, Net, liabilities	(226)	0	(399)	0
Gross Transfers In, liabilities	0	0	0	0
Gross Transfers Out, liabilities	0	0	0	0
Divested Businesses	0	3,673	0	3,673
Fair Value End of Year, liabilities	5,317	4,510	5,317	4,510
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period, liabilities	(1,452)	663	1,503	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	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	26,642	24,924	26,889	25,931
Net Realized and Unrealized Gains (Losses) Included in Income, assets	175	214	369	308
Other Comprehensive Income (Loss), assets	172	1,720	(3)	(577)
Purchases, Sales, Issuances and Settlements, Net, assets	(782)	59	(1,080)	71
Gross Transfers In, assets	596	860	1,294	2,641
Gross Transfers Out, assets	(596)	(305)	(1,262)	(902)
Divested Businesses	0	0	0	0
Fair Value End of Period, assets	26,207	27,472	26,207	27,472
Changes in Unrealized Gains (Losses) Included 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	1,672	1,497	(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	1,896	2,102	2,105	2,121
Net Realized and Unrealized Gains (Losses) Included in Income, assets	5	0	8	5
Other Comprehensive Income (Loss), assets	128	254	(31)	199
Purchases, Sales, Issuances and Settlements, Net, assets	(65)	20	(118)	157
Gross Transfers In, assets	0	0	0	27
Gross Transfers Out, assets	(25)	(97)	(25)	(230)
Divested Businesses	0	0	0	0
Fair Value End of Period, assets	1,939	2,279	1,939	2,279
Changes in Unrealized Gains (Losses) Included 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	244	234	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	6	5	0
Net Realized and Unrealized Gains (Losses) Included in Income, assets	0	0	0	0
Other Comprehensive Income (Loss), assets	(1)	0	(1)	0
Purchases, Sales, Issuances and Settlements, Net, assets	1	5	1	5
Gross Transfers In, assets	4	0	5	6
Gross Transfers Out, assets	0	(6)	0	(6)
Divested Businesses	0	0	0	0
Fair Value End of Period, assets	10	5	10	5
Changes in Unrealized Gains (Losses) Included 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	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	2,570	1,215	2,349	1,663
Net Realized and Unrealized Gains (Losses) Included in Income, assets	14	(1)	13	(68)
Other Comprehensive Income (Loss), assets	17	72	7	(9)
Purchases, Sales, Issuances and Settlements, Net, assets	31	113	208	120
Gross Transfers In, assets	208	519	395	622
Gross Transfers Out, assets	(67)	(18)	(199)	(428)
Divested Businesses	0	0	0	0
Fair Value End of Period, assets	2,773	1,900	2,773	1,900
Changes in Unrealized Gains (Losses) Included 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	50	(109)	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	11,464	11,687	11,694	13,408
Net Realized and Unrealized Gains (Losses) Included in Income, assets	150	208	317	340
Other Comprehensive Income (Loss), assets	(39)	947	25	(676)
Purchases, Sales, Issuances and Settlements, Net, assets	(460)	(171)	(891)	(394)
Gross Transfers In, assets	0	7	0	26
Gross Transfers Out, assets	(30)	0	(60)	(26)
Divested Businesses	0	0	0	0
Fair Value End of Period, assets	11,085	12,678	11,085	12,678
Changes in Unrealized Gains (Losses) Included 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	957	943	(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	1,104	1,146	922	1,053
Net Realized and Unrealized Gains (Losses) Included in Income, assets	7	4	16	11
Other Comprehensive Income (Loss), assets	23	15	(33)	34
Purchases, Sales, Issuances and Settlements, Net, assets	85	(16)	258	28
Gross Transfers In, assets	0	0	56	23
Gross Transfers Out, assets	(137)	0	(137)	0
Divested Businesses	0	0	0	0
Fair Value End of Period, assets	1,082	1,149	1,082	1,149
Changes in Unrealized Gains (Losses) Included 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	18	(38)	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	9,602	8,768	9,814	7,686
Net Realized and Unrealized Gains (Losses) Included in Income, assets	(1)	3	15	20
Other Comprehensive Income (Loss), assets	44	432	30	(125)
Purchases, Sales, Issuances and Settlements, Net, assets	(374)	108	(538)	155
Gross Transfers In, assets	384	334	838	1,937
Gross Transfers Out, assets	(337)	(184)	(841)	(212)
Divested Businesses	0	0	0	0
Fair Value End of Period, assets	9,318	9,461	9,318	9,461
Changes in Unrealized Gains (Losses) Included 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	403	467	(134)
Other bond securities
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation calculation
Fair Value Beginning of Period, assets	2,518	2,569	2,698	3,738
Net Realized and Unrealized Gains (Losses) Included in Income, assets	46	294	37	100
Other Comprehensive Income (Loss), assets	0	0	0	0
Purchases, Sales, Issuances and Settlements, Net, assets	(126)	(117)	(303)	(1,092)
Gross Transfers In, assets	0	0	6	0
Gross Transfers Out, assets	0	0	0	0
Divested Businesses	0	0	0	0
Fair Value End of Period, assets	2,438	2,746	2,438	2,746
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period, assets	271	272	173	(12)
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period, assets	0	0	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	126	149	139	143
Net Realized and Unrealized Gains (Losses) Included in Income, assets	1	14	4	0
Other Comprehensive Income (Loss), assets	0	0	0	0
Purchases, Sales, Issuances and Settlements, Net, assets	(14)	5	(30)	25
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	113	168	113	168
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period, assets	12	13	(86)	(1)
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period, assets	0	0	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	46	42	47	50
Net Realized and Unrealized Gains (Losses) Included in Income, assets	0	6	(1)	(1)
Other Comprehensive Income (Loss), assets	0	0	0	0
Purchases, Sales, Issuances and Settlements, Net, assets	0	(1)	(6)	(2)
Gross Transfers In, assets	0	0	6	0
Gross Transfers Out, assets	0	0	0	0
Divested Businesses	0	0	0	0
Fair Value End of Period, assets	46	47	46	47
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period, assets	6	6	4	(2)
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period, assets	0	0	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	2,346	2,378	2,512	3,545
Net Realized and Unrealized Gains (Losses) Included in Income, assets	45	274	34	101
Other Comprehensive Income (Loss), assets	0	0	0	0
Purchases, Sales, Issuances and Settlements, Net, assets	(112)	(121)	(267)	(1,115)
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	2,279	2,531	2,279	2,531
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period, assets	253	253	255	(9)
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period, assets	0	0	0	0
Equity securities
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation calculation
Fair Value Beginning of Period, assets	128	19	51	8
Net Realized and Unrealized Gains (Losses) Included in Income, assets	0	0	11	(1)
Other Comprehensive Income (Loss), assets	(3)	0	0	1
Purchases, Sales, Issuances and Settlements, Net, assets	(112)	0	(123)	10
Gross Transfers In, assets	1	25	76	26
Gross Transfers Out, assets	(10)	(1)	(11)	(1)
Divested Businesses	0	0	0	0
Fair Value End of Period, assets	4	43	4	43
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period, assets	0	0	3	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	0	0
Other invested assets
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation calculation
Fair Value Beginning of Period, assets	1,897	1,467	1,827	1,192
Net Realized and Unrealized Gains (Losses) Included in Income, assets	114	(59)	256	(63)
Other Comprehensive Income (Loss), assets	(1)	0	(7)	0
Purchases, Sales, Issuances and Settlements, Net, assets	89	78	23	207
Gross Transfers In, assets	0	0	0	150
Gross Transfers Out, assets	0	0	0	0
Divested Businesses	0	0	0	0
Fair Value End of Period, assets	2,099	1,486	2,099	1,486
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period, assets	122	0	245	(48)
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period, assets	0	0	0	0
Other assets
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation calculation
Fair Value Beginning of Period, assets	113	91	113	89
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	0	54	0	59
Gross Transfers In, assets	0	0	0	0
Gross Transfers Out, assets	0	0	0	0
Divested Businesses	0	(34)	0	(37)
Fair Value End of Period, assets	113	111	113	111
Changes in Unrealized Gains (Losses) Included 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	$ 0	$ 0