FAIR VALUE MEASUREMENTS (Details - Changes in Level 3 Recurring Fair Value Measurements) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation calculation
Fair Value Beginning of Period, assets	$ 31,858	$ 33,782	$ 30,958	$ 33,610
Net Realized and Unrealized Gains (Losses) Included in Income, assets	385	271	729	988
Other Comprehensive Income (Loss), assets	566	201	(10)	843
Purchases, Sales, Issuances and Settlements, Net, assets	(740)	(1,373)	(1,485)	(2,724)
Gross Transfers In, assets	588	142	3,405	1,441
Gross Transfers Out, assets	(870)	(608)	(1,773)	(1,743)
Divested Businesses	(1)	0	(38)	0
Fair Value End of Period, assets	31,786	32,415	31,786	32,415
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period, assets	40	32	15	142
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period, assets	572		143
Liabilities
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation calculation
Fair Value Beginning of Period, liabilities	13,731	6,130	6,808	4,269
Net realized and unrealized gains (losses) included in income, liabilities	664	835	3,658	2,287
Other Comprehensive Income (Loss), liabilities	0	0	0	0
Purchases, Sales, Issuances and Settlements, Net, liabilities	(11)	194	245	603
Gross Transfers In, liabilities	(1)	0	(1)	0
Gross Transfers Out, liabilities	5	0	5	0
Divested Businesses	0	0	3,673	0
Fair Value End of Year, liabilities	14,388	7,159	14,388	7,159
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period, liabilities	30	(675)	(2,361)	(1,961)
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	9,233	6,065	6,910	4,116
Net realized and unrealized gains (losses) included in income, liabilities	19	861	2,250	2,400
Other Comprehensive Income (Loss), liabilities	0	0	0	0
Purchases, Sales, Issuances and Settlements, Net, liabilities	70	240	162	650
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	9,322	7,166	9,322	7,166
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period, liabilities	273	(691)	(1,436)	(2,044)
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	(12)	65	(102)	153
Net realized and unrealized gains (losses) included in income, liabilities	(11)	(26)	(85)	(113)
Other Comprehensive Income (Loss), liabilities	0	0	0	0
Purchases, Sales, Issuances and Settlements, Net, liabilities	(51)	(46)	113	(47)
Gross Transfers In, liabilities	(1)	0	(1)	0
Gross Transfers Out, liabilities	5	0	5	0
Divested Businesses	0	0	0	0
Fair Value End of Year, liabilities	(70)	(7)	(70)	(7)
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period, liabilities	13	16	(6)	83
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	16	0	15
Net realized and unrealized gains (losses) included in income, liabilities	0	(3)	(1)	0
Other Comprehensive Income (Loss), liabilities	0	0	0	0
Purchases, Sales, Issuances and Settlements, Net, liabilities	0	(13)	1	(15)
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	0	0	0
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period, liabilities	0	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
Foreign exchange contracts
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation calculation
Fair Value Beginning of Period, liabilities	(1)	(4)	(6)	(5)
Net realized and unrealized gains (losses) included in income, liabilities	(2)	6	2	(4)
Other Comprehensive Income (Loss), liabilities	0	0	0	0
Purchases, Sales, Issuances and Settlements, Net, liabilities	0	(3)	1	8
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)	(1)	(3)	(1)
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period, liabilities	2	0	2	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
Equity contracts
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation calculation
Fair Value Beginning of Period, liabilities	(53)	(113)	(151)	(75)
Net realized and unrealized gains (losses) included in income, liabilities	9	12	19	(8)
Other Comprehensive Income (Loss), liabilities	0	0	0	0
Purchases, Sales, Issuances and Settlements, Net, liabilities	(65)	0	23	(18)
Gross Transfers In, liabilities	(1)	0	(1)	0
Gross Transfers Out, liabilities	5	0	5	0
Divested Businesses	0	0	0	0
Fair Value End of Year, liabilities	(105)	(101)	(105)	(101)
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period, liabilities	0	(13)	(62)	19
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	45	173	62	227
Net realized and unrealized gains (losses) included in income, liabilities	1	(24)	(59)	(51)
Other Comprehensive Income (Loss), liabilities	0	0	0	0
Purchases, Sales, Issuances and Settlements, Net, liabilities	(2)	(47)	41	(74)
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	44	102	44	102
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period, liabilities	(7)	14	8	13
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	(3)	(7)	(7)	(9)
Net realized and unrealized gains (losses) included in income, liabilities	(19)	(17)	(46)	(50)
Other Comprehensive Income (Loss), liabilities	0	0	0	0
Purchases, Sales, Issuances and Settlements, Net, liabilities	16	17	47	52
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	(6)	(7)	(6)	(7)
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period, liabilities	18	15	45	50
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	4,510		0
Net realized and unrealized gains (losses) included in income, liabilities	656		1,493
Other Comprehensive Income (Loss), liabilities	0		0
Purchases, Sales, Issuances and Settlements, Net, liabilities	(30)		(30)
Gross Transfers In, liabilities	0		0
Gross Transfers Out, liabilities	0		0
Divested Businesses	0		3,673
Fair Value End of Year, liabilities	5,136		5,136
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period, liabilities	(256)		(919)
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	27,472	28,013	25,931	27,093
Net Realized and Unrealized Gains (Losses) Included in Income, assets	170	140	478	591
Other Comprehensive Income (Loss), assets	566	201	(11)	842
Purchases, Sales, Issuances and Settlements, Net, assets	(652)	(946)	(581)	(1,390)
Gross Transfers In, assets	581	140	3,222	1,439
Gross Transfers Out, assets	(843)	(604)	(1,745)	(1,631)
Divested Businesses	0	0	0	0
Fair Value End of Period, assets	27,294	26,944	27,294	26,944
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	572		143
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	2,279	2,162	2,121	2,000
Net Realized and Unrealized Gains (Losses) Included in Income, assets	3	(1)	8	(2)
Other Comprehensive Income (Loss), assets	(4)	119	195	321
Purchases, Sales, Issuances and Settlements, Net, assets	(30)	92	127	178
Gross Transfers In, assets	0	0	27	35
Gross Transfers Out, assets	(65)	(265)	(295)	(425)
Divested Businesses	0	0	0	0
Fair Value End of Period, assets	2,183	2,107	2,183	2,107
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		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	5	2	0	11
Net Realized and Unrealized Gains (Losses) Included in Income, assets	0	6	0	5
Other Comprehensive Income (Loss), assets	1	0	1	0
Purchases, Sales, Issuances and Settlements, Net, assets	0	0	5	(4)
Gross Transfers In, assets	1	5	7	5
Gross Transfers Out, assets	0	0	(6)	(4)
Divested Businesses	0	0	0	0
Fair Value End of Period, assets	7	13	7	13
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
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	1,900	1,821	1,663	864
Net Realized and Unrealized Gains (Losses) Included in Income, assets	(33)	(36)	(101)	(10)
Other Comprehensive Income (Loss), assets	52	(2)	43	79
Purchases, Sales, Issuances and Settlements, Net, assets	(25)	(535)	95	(600)
Gross Transfers In, assets	452	112	1,074	1,155
Gross Transfers Out, assets	(231)	(85)	(659)	(213)
Divested Businesses	0	0	0	0
Fair Value End of Period, assets	2,115	1,275	2,115	1,275
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	38		59
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	12,678	13,863	13,408	14,199
Net Realized and Unrealized Gains (Losses) Included in Income, assets	192	166	532	575
Other Comprehensive Income (Loss), assets	301	15	(375)	176
Purchases, Sales, Issuances and Settlements, Net, assets	(412)	(418)	(806)	(1,234)
Gross Transfers In, assets	3	16	29	83
Gross Transfers Out, assets	(107)	(82)	(133)	(239)
Divested Businesses	0	0	0	0
Fair Value End of Period, assets	12,655	13,560	12,655	13,560
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	335		(213)
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	1,149	1,103	1,053	917
Net Realized and Unrealized Gains (Losses) Included in Income, assets	3	2	14	8
Other Comprehensive Income (Loss), assets	36	32	70	62
Purchases, Sales, Issuances and Settlements, Net, assets	(11)	85	17	381
Gross Transfers In, assets	0	0	23	58
Gross Transfers Out, assets	(196)	(172)	(196)	(376)
Divested Businesses	0	0	0	0
Fair Value End of Period, assets	981	1,050	981	1,050
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	27		66
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	9,461	9,062	7,686	9,102
Net Realized and Unrealized Gains (Losses) Included in Income, assets	5	3	25	15
Other Comprehensive Income (Loss), assets	180	37	55	204
Purchases, Sales, Issuances and Settlements, Net, assets	(174)	(170)	(19)	(111)
Gross Transfers In, assets	125	7	2,062	103
Gross Transfers Out, assets	(244)	0	(456)	(374)
Divested Businesses	0	0	0	0
Fair Value End of Period, assets	9,353	8,939	9,353	8,939
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	172		38
Other bond securities
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation calculation
Fair Value Beginning of Period, assets	2,746	5,068	3,738	5,845
Net Realized and Unrealized Gains (Losses) Included in Income, assets	141	125	241	373
Other Comprehensive Income (Loss), assets	0	0	0	0
Purchases, Sales, Issuances and Settlements, Net, assets	(116)	(375)	(1,208)	(1,293)
Gross Transfers In, assets	0	0	0	0
Gross Transfers Out, assets	0	(4)	0	(111)
Divested Businesses	0	0	0	0
Fair Value End of Period, assets	2,771	4,814	2,771	4,814
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period, assets	39	27	27	113
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	168	830	143	1,290
Net Realized and Unrealized Gains (Losses) Included in Income, assets	16	9	16	69
Other Comprehensive Income (Loss), assets	0	0	0	0
Purchases, Sales, Issuances and Settlements, Net, assets	(16)	(24)	9	(544)
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	815	168	815
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period, assets	4	1	3	(18)
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	47	88	50	77
Net Realized and Unrealized Gains (Losses) Included in Income, assets	1	1	0	5
Other Comprehensive Income (Loss), assets	0	0	0	0
Purchases, Sales, Issuances and Settlements, Net, assets	0	(17)	(2)	0
Gross Transfers In, assets	0	0	0	0
Gross Transfers Out, assets	0	(4)	0	(14)
Divested Businesses	0	0	0	0
Fair Value End of Period, assets	48	68	48	68
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period, assets	1	(2)	(1)	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 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	2,531	4,150	3,545	4,478
Net Realized and Unrealized Gains (Losses) Included in Income, assets	124	115	225	299
Other Comprehensive Income (Loss), assets	0	0	0	0
Purchases, Sales, Issuances and Settlements, Net, assets	(100)	(334)	(1,215)	(749)
Gross Transfers In, assets	0	0	0	0
Gross Transfers Out, assets	0	0	0	(97)
Divested Businesses	0	0	0	0
Fair Value End of Period, assets	2,555	3,931	2,555	3,931
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period, assets	34	28	25	128
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	43	35	8	27
Net Realized and Unrealized Gains (Losses) Included in Income, assets	0	0	(1)	0
Other Comprehensive Income (Loss), assets	2	0	3	0
Purchases, Sales, Issuances and Settlements, Net, assets	1	(29)	11	(20)
Gross Transfers In, assets	7	2	33	2
Gross Transfers Out, assets	(27)	0	(28)	(1)
Divested Businesses	0	0	0	0
Fair Value End of Period, assets	26	8	26	8
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period, assets	1	(2)	1	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 invested assets
Fair value assets and liabilities measured on recurring basis, unobservable input reconciliation calculation
Fair Value Beginning of Period, assets	1,486	605	1,192	587
Net Realized and Unrealized Gains (Losses) Included in Income, assets	74	6	11	24
Other Comprehensive Income (Loss), assets	(2)	0	(2)	1
Purchases, Sales, Issuances and Settlements, Net, assets	25	(22)	232	(23)
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	1,583	589	1,583	589
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period, assets	0	7	(13)	27
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	111	61	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	2	(1)	61	2
Gross Transfers In, assets	0	0	0	0
Gross Transfers Out, assets	0	0	0	0
Divested Businesses	(1)	0	(38)	0
Fair Value End of Period, assets	112	60	112	60
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