FAIR VALUE MEASUREMENTS (Details - Changes in Level 3 Recurring Fair Value Measurements) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation calculation
Fair Value Beginning of Period, assets	$ 31,627	$ 31,578
Net Realized and Unrealized Gains (Losses) Included in Income, assets	136	338
Other Comprehensive Income (Loss), assets	(1,485)	(178)
Purchases, Sales, Issuances and Settlements, Net, assets	346	(552)
Gross Transfers In, assets	1,411	779
Gross Transfers Out, assets	(1,622)	(667)
Other	0	0
Fair Value End of Period, assets	30,413	31,298
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period, assets	(50)	28
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period, assets	(1,451)	(175)
Liabilities
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation calculation
Fair Value Beginning of Period, liabilities	15,176	15,721
Net realized and unrealized gains (losses) included in income, liabilities	(4,832)	(4,679)
Other Comprehensive Income (Loss), liabilities	0	0
Purchases, Sales, Issuances and Settlements, Net, liabilities	(273)	(165)
Gross Transfers In, liabilities	0	0
Gross Transfers Out, liabilities	0	40
Other	0	0
Fair Value End of Year, liabilities	10,071	10,917
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period, liabilities	5,239	5,419
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	9,682	9,798
Net realized and unrealized gains (losses) included in income, liabilities	(1,797)	(2,260)
Other Comprehensive Income (Loss), liabilities	0	0
Purchases, Sales, Issuances and Settlements, Net, liabilities	145	79
Gross Transfers In, liabilities	0	0
Gross Transfers Out, liabilities	0	0
Other	0	0
Fair Value End of Year, liabilities	8,030	7,617
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period, liabilities	1,983	2,570
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	(428)	(119)
Net realized and unrealized gains (losses) included in income, liabilities	283	(37)
Other Comprehensive Income (Loss), liabilities	0	0
Purchases, Sales, Issuances and Settlements, Net, liabilities	(20)	(71)
Gross Transfers In, liabilities	0	0
Gross Transfers Out, liabilities	0	40
Other	0	0
Fair Value End of Year, liabilities	(165)	(187)
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period, liabilities	(224)	(106)
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	0
Net realized and unrealized gains (losses) included in income, liabilities	(1)	0
Other Comprehensive Income (Loss), liabilities	0	0
Purchases, Sales, Issuances and Settlements, Net, liabilities	(3)	0
Gross Transfers In, liabilities	0	0
Gross Transfers Out, liabilities	0	0
Other	0	0
Fair Value End of Year, liabilities	(4)	0
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period, liabilities	1	0
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	(1)	(2)
Net realized and unrealized gains (losses) included in income, liabilities	0	1
Other Comprehensive Income (Loss), liabilities	0	0
Purchases, Sales, Issuances and Settlements, Net, liabilities	1	1
Gross Transfers In, liabilities	0	0
Gross Transfers Out, liabilities	0	0
Other	0	0
Fair Value End of Year, liabilities	0	0
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period, liabilities	(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
Equity contracts
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation calculation
Fair Value Beginning of Period, liabilities	(444)	(151)
Net realized and unrealized gains (losses) included in income, liabilities	301	(26)
Other Comprehensive Income (Loss), liabilities	0	0
Purchases, Sales, Issuances and Settlements, Net, liabilities	(35)	(85)
Gross Transfers In, liabilities	0	0
Gross Transfers Out, liabilities	0	40
Other	0	0
Fair Value End of Year, liabilities	(178)	(222)
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period, liabilities	(241)	(118)
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	30	42
Net realized and unrealized gains (losses) included in income, liabilities	1	5
Other Comprehensive Income (Loss), liabilities	0	0
Purchases, Sales, Issuances and Settlements, Net, liabilities	0	(3)
Gross Transfers In, liabilities	0	0
Gross Transfers Out, liabilities	0	0
Other	0	0
Fair Value End of Year, liabilities	31	44
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period, liabilities	(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
Other contracts
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation calculation
Fair Value Beginning of Period, liabilities	(13)	(8)
Net realized and unrealized gains (losses) included in income, liabilities	(18)	(17)
Other Comprehensive Income (Loss), liabilities	0	0
Purchases, Sales, Issuances and Settlements, Net, liabilities	17	16
Gross Transfers In, liabilities	0	0
Gross Transfers Out, liabilities	0	0
Other	0	0
Fair Value End of Year, liabilities	(14)	(9)
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period, liabilities	18	16
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	5,922	6,042
Net realized and unrealized gains (losses) included in income, liabilities	(3,318)	(2,382)
Other Comprehensive Income (Loss), liabilities	0	0
Purchases, Sales, Issuances and Settlements, Net, liabilities	(398)	(173)
Gross Transfers In, liabilities	0	0
Gross Transfers Out, liabilities	0	0
Other	0	0
Fair Value End of Year, liabilities	2,206	3,487
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period, liabilities	3,480	2,955
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period, 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	26,862	26,889
Net Realized and Unrealized Gains (Losses) Included in Income, assets	145	194
Other Comprehensive Income (Loss), assets	(1,479)	(175)
Purchases, Sales, Issuances and Settlements, Net, assets	85	(298)
Gross Transfers In, assets	1,246	698
Gross Transfers Out, assets	(1,455)	(666)
Other	0	0
Fair Value End of Period, assets	25,404	26,642
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period, assets	0	0
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period, assets	(1,451)	(175)
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	1,431	2,105
Net Realized and Unrealized Gains (Losses) Included in Income, assets	2	3
Other Comprehensive Income (Loss), assets	(285)	(159)
Purchases, Sales, Issuances and Settlements, Net, assets	(61)	(53)
Gross Transfers In, assets	0	0
Gross Transfers Out, assets	0	0
Other	0	0
Fair Value End of Period, assets	1,087	1,896
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period, assets	0	0
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period, assets	(273)	(10)
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	7	5
Net Realized and Unrealized Gains (Losses) Included in Income, assets	0	0
Other Comprehensive Income (Loss), assets	0	0
Purchases, Sales, Issuances and Settlements, Net, assets	0	0
Gross Transfers In, assets	1	1
Gross Transfers Out, assets	0	0
Other	0	0
Fair Value End of Period, assets	8	6
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period, assets	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	2,641	2,349
Net Realized and Unrealized Gains (Losses) Included in Income, assets	(11)	(1)
Other Comprehensive Income (Loss), assets	(73)	(10)
Purchases, Sales, Issuances and Settlements, Net, assets	177	177
Gross Transfers In, assets	130	187
Gross Transfers Out, assets	(120)	(132)
Other	0	0
Fair Value End of Period, assets	2,744	2,570
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period, assets	0	0
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period, assets	(69)	(159)
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	10,378	11,694
Net Realized and Unrealized Gains (Losses) Included in Income, assets	130	167
Other Comprehensive Income (Loss), assets	(553)	64
Purchases, Sales, Issuances and Settlements, Net, assets	(608)	(431)
Gross Transfers In, assets	0	0
Gross Transfers Out, assets	(422)	(30)
Other	0	0
Fair Value End of Period, assets	8,925	11,464
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period, assets	0	0
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period, assets	(544)	(14)
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	1,190	922
Net Realized and Unrealized Gains (Losses) Included in Income, assets	8	9
Other Comprehensive Income (Loss), assets	(67)	(56)
Purchases, Sales, Issuances and Settlements, Net, assets	32	173
Gross Transfers In, assets	0	56
Gross Transfers Out, assets	(299)	0
Other	0	0
Fair Value End of Period, assets	864	1,104
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period, assets	0	0
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period, assets	(64)	(56)
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	11,215	9,814
Net Realized and Unrealized Gains (Losses) Included in Income, assets	16	16
Other Comprehensive Income (Loss), assets	(501)	(14)
Purchases, Sales, Issuances and Settlements, Net, assets	545	(164)
Gross Transfers In, assets	1,115	454
Gross Transfers Out, assets	(614)	(504)
Other	0	0
Fair Value End of Period, assets	11,776	9,602
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period, assets	0	0
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period, assets	(501)	64
Other bond securities
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation calculation
Fair Value Beginning of Period, assets	2,697	2,698
Net Realized and Unrealized Gains (Losses) Included in Income, assets	(121)	(9)
Other Comprehensive Income (Loss), assets	(1)	0
Purchases, Sales, Issuances and Settlements, Net, assets	281	(177)
Gross Transfers In, assets	118	6
Gross Transfers Out, assets	(14)	0
Other	0	0
Fair Value End of Period, assets	2,960	2,518
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period, assets	(171)	(98)
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 | Corporate debt
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation calculation
Fair Value Beginning of Period, assets	134
Net Realized and Unrealized Gains (Losses) Included in Income, assets	0
Other Comprehensive Income (Loss), assets	0
Purchases, Sales, Issuances and Settlements, Net, assets	77
Gross Transfers In, assets	61
Gross Transfers Out, assets	(12)
Other	0
Fair Value End of Period, assets	260
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period, assets	0
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period, assets	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	196	139
Net Realized and Unrealized Gains (Losses) Included in Income, assets	(5)	3
Other Comprehensive Income (Loss), assets	(1)	0
Purchases, Sales, Issuances and Settlements, Net, assets	9	(16)
Gross Transfers In, assets	0	0
Gross Transfers Out, assets	0	0
Other	0	0
Fair Value End of Period, assets	199	126
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period, assets	(8)	(98)
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	35	47
Net Realized and Unrealized Gains (Losses) Included in Income, assets	(2)	(1)
Other Comprehensive Income (Loss), assets	0	0
Purchases, Sales, Issuances and Settlements, Net, assets	0	(6)
Gross Transfers In, assets	0	6
Gross Transfers Out, assets	0	0
Other	0	0
Fair Value End of Period, assets	33	46
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period, assets	(2)	(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
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	2,332	2,512
Net Realized and Unrealized Gains (Losses) Included in Income, assets	(114)	(11)
Other Comprehensive Income (Loss), assets	0	0
Purchases, Sales, Issuances and Settlements, Net, assets	195	(155)
Gross Transfers In, assets	57	0
Gross Transfers Out, assets	(2)	0
Other	0	0
Fair Value End of Period, assets	2,468	2,346
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period, assets	(161)	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
Equity securities
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation calculation
Fair Value Beginning of Period, assets	6	51
Net Realized and Unrealized Gains (Losses) Included in Income, assets	0	11
Other Comprehensive Income (Loss), assets	(1)	3
Purchases, Sales, Issuances and Settlements, Net, assets	1	(11)
Gross Transfers In, assets	0	75
Gross Transfers Out, assets	0	(1)
Other	0	0
Fair Value End of Period, assets	6	128
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period, assets	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	1,948	1,827
Net Realized and Unrealized Gains (Losses) Included in Income, assets	112	142
Other Comprehensive Income (Loss), assets	(4)	(6)
Purchases, Sales, Issuances and Settlements, Net, assets	(15)	(66)
Gross Transfers In, assets	47	0
Gross Transfers Out, assets	(153)	0
Other	0	0
Fair Value End of Period, assets	1,935	1,897
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period, assets	121	123
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	114	113
Net Realized and Unrealized Gains (Losses) Included in Income, assets	0	0
Other Comprehensive Income (Loss), assets	0	0
Purchases, Sales, Issuances and Settlements, Net, assets	(6)	0
Gross Transfers In, assets	0	0
Gross Transfers Out, assets	0	0
Other	0	0
Fair Value End of Period, assets	108	113
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period, assets	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