FAIR VALUE MEASUREMENTS (Details - Assets and Liabilities Measured at Fair Value on a Recurring Basis) - USD ($) $ in Millions		Dec. 31, 2020	Dec. 31, 2019
Fair Value, Assets Measured on Recurring Basis
Bonds available for sale	[1]	$ 271,496	$ 251,086
Other bond securities	[1]	5,291	6,682
Equity securities	[1]	1,056	841
Other invested assets		8,422	6,827
Derivative Assets, Fair Value, Gross		6,805	5,026
Derivative assets, Counterparty netting		(3,812)	(2,427)
Derivative assets, Cash collateral		(2,219)	(1,806)
Derivative assets		774	793
Short-term investments		5,968	5,343
Separate account assets, at fair value		100,290	93,272
Fair Value, Liabilities Measured on Recurring Basis
Policyholder contract deposits, portion measured at fair value		9,798	6,910
Other policyholder funds		3,548	3,428
Derivative Liabilities, Fair Value, Gross		5,822	4,009
Derivative liabilities, Counterparty netting		(3,812)	(2,427)
Derivative liabilities, Cash collateral		(1,441)	(527)
Derivative liabilities		569	1,055
Fortitude Re funds withheld payable		43,060	0
Other liabilities		570	1,100
Long-term debt		2,097	2,062
Fair Value Using Net Asset Value Per Share or its equivalent		6,493	5,549
Level 1
Fair Value, Liabilities Measured on Recurring Basis
Fortitude Re funds withheld payable		0
Level 2
Fair Value, Liabilities Measured on Recurring Basis
Fortitude Re funds withheld payable		0
Level 3
Fair Value, Liabilities Measured on Recurring Basis
Fortitude Re funds withheld payable		37,018
Recurring Basis
Fair Value, Assets Measured on Recurring Basis
Bonds available for sale		271,496	251,086
Other bond securities		5,291	6,682
Equity securities		1,056	841
Other invested assets		1,929	1,278
Derivative assets, Counterparty netting		(3,812)	(2,427)
Derivative assets, Cash collateral		(2,219)	(1,806)
Derivative assets, Counterparty netting and cash collateral		(6,031)	(4,233)
Derivative assets		774	793
Short-term investments		5,968	5,343
Other assets		113	2,358
Separate account assets, at fair value		100,290	93,272
Fair value assets measured on recurring basis, total		386,917	361,653
Fair Value, Liabilities Measured on Recurring Basis
Policyholder contract deposits, portion measured at fair value		9,798	6,910
Derivative liabilities, Counterparty netting		(3,812)	(2,427)
Derivative liabilities, Cash collateral		(1,441)	(527)
Derivative liabilities, Counterparty netting and cash collateral		(5,253)	(2,954)
Derivative liabilities		569	1,055
Fortitude Re funds withheld payable		6,042
Other liabilities		1	45
Long-term debt		2,097	2,062
Fair value liabilities measured on recurring basis, total		18,507	10,072
Recurring Basis | Interest rate contracts
Fair Value, Assets Measured on Recurring Basis
Derivative Assets, Fair Value, Gross		4,637	3,200
Fair Value, Liabilities Measured on Recurring Basis
Derivative Liabilities, Fair Value, Gross		4,436	2,749
Recurring Basis | Foreign exchange contracts
Fair Value, Assets Measured on Recurring Basis
Derivative Assets, Fair Value, Gross		1,022	1,040
Fair Value, Liabilities Measured on Recurring Basis
Derivative Liabilities, Fair Value, Gross		1,090	1,025
Recurring Basis | Equity contracts
Fair Value, Assets Measured on Recurring Basis
Derivative Assets, Fair Value, Gross		1,130	769
Fair Value, Liabilities Measured on Recurring Basis
Derivative Liabilities, Fair Value, Gross		223	139
Recurring Basis | Credit contracts
Fair Value, Assets Measured on Recurring Basis
Derivative Assets, Fair Value, Gross		2	3
Fair Value, Liabilities Measured on Recurring Basis
Derivative Liabilities, Fair Value, Gross		67	89
Recurring Basis | Other contracts
Fair Value, Assets Measured on Recurring Basis
Derivative Assets, Fair Value, Gross		14	14
Fair Value, Liabilities Measured on Recurring Basis
Derivative Liabilities, Fair Value, Gross		6	7
Recurring Basis | U.S. government and government sponsored entities
Fair Value, Assets Measured on Recurring Basis
Bonds available for sale		4,126	5,380
Other bond securities		1,845	2,121
Recurring Basis | Obligations of states, municipalities and political subdivisions
Fair Value, Assets Measured on Recurring Basis
Bonds available for sale		16,124	15,318
Recurring Basis | Non-U.S. governments
Fair Value, Assets Measured on Recurring Basis
Bonds available for sale		15,345	14,869
Other bond securities		0	0
Recurring Basis | Corporate debt
Fair Value, Assets Measured on Recurring Basis
Bonds available for sale		169,298	149,636
Other bond securities		12	18
Recurring Basis | Residential mortgage-backed securities (RMBS)
Fair Value, Assets Measured on Recurring Basis
Bonds available for sale		31,465	32,805
Other bond securities		429	489
Recurring Basis | Commercial mortgage-backed securities (CMBS)
Fair Value, Assets Measured on Recurring Basis
Bonds available for sale		16,133	14,430
Other bond securities		320	322
Recurring Basis | Collateralized Debt Obligations/Asset Backed Securities (CDO/ABS)
Fair Value, Assets Measured on Recurring Basis
Bonds available for sale		19,005	18,648
Other bond securities		2,685	3,732
Recurring Basis | Level 1
Fair Value, Assets Measured on Recurring Basis
Bonds available for sale		101	195
Other bond securities		0	0
Equity securities		929	756
Other invested assets		0	0
Derivative Assets, Fair Value, Gross		9	6
Short-term investments		2,379	2,299
Other assets		0	57
Separate account assets, at fair value		96,560	89,069
Fair value assets measured on recurring basis, total		99,978	92,382
Fair Value, Liabilities Measured on Recurring Basis
Policyholder contract deposits, portion measured at fair value		0	0
Derivative Liabilities, Fair Value, Gross		15	12
Fortitude Re funds withheld payable		0
Other liabilities		0	0
Long-term debt		0	0
Fair value liabilities measured on recurring basis, total		15	12
Recurring Basis | Level 1 | Interest rate contracts
Fair Value, Assets Measured on Recurring Basis
Derivative Assets, Fair Value, Gross		0	1
Fair Value, Liabilities Measured on Recurring Basis
Derivative Liabilities, Fair Value, Gross		1	4
Recurring Basis | Level 1 | Foreign exchange contracts
Fair Value, Assets Measured on Recurring Basis
Derivative Assets, Fair Value, Gross		0	0
Fair Value, Liabilities Measured on Recurring Basis
Derivative Liabilities, Fair Value, Gross		0	0
Recurring Basis | Level 1 | Equity contracts
Fair Value, Assets Measured on Recurring Basis
Derivative Assets, Fair Value, Gross		9	5
Fair Value, Liabilities Measured on Recurring Basis
Derivative Liabilities, Fair Value, Gross		14	8
Recurring Basis | Level 1 | Credit contracts
Fair Value, Assets Measured on Recurring Basis
Derivative Assets, Fair Value, Gross		0	0
Fair Value, Liabilities Measured on Recurring Basis
Derivative Liabilities, Fair Value, Gross		0	0
Recurring Basis | Level 1 | Other contracts
Fair Value, Assets Measured on Recurring Basis
Derivative Assets, Fair Value, Gross		0	0
Fair Value, Liabilities Measured on Recurring Basis
Derivative Liabilities, Fair Value, Gross		0	0
Recurring Basis | Level 1 | U.S. government and government sponsored entities
Fair Value, Assets Measured on Recurring Basis
Bonds available for sale		73	135
Other bond securities		0	0
Recurring Basis | Level 1 | Obligations of states, municipalities and political subdivisions
Fair Value, Assets Measured on Recurring Basis
Bonds available for sale		0	0
Recurring Basis | Level 1 | Non-U.S. governments
Fair Value, Assets Measured on Recurring Basis
Bonds available for sale		28	60
Other bond securities		0	0
Recurring Basis | Level 1 | Corporate debt
Fair Value, Assets Measured on Recurring Basis
Bonds available for sale		0	0
Other bond securities		0	0
Recurring Basis | Level 1 | Residential mortgage-backed securities (RMBS)
Fair Value, Assets Measured on Recurring Basis
Bonds available for sale		0	0
Other bond securities		0	0
Recurring Basis | Level 1 | Commercial mortgage-backed securities (CMBS)
Fair Value, Assets Measured on Recurring Basis
Bonds available for sale		0	0
Other bond securities		0	0
Recurring Basis | Level 1 | Collateralized Debt Obligations/Asset Backed Securities (CDO/ABS)
Fair Value, Assets Measured on Recurring Basis
Bonds available for sale		0	0
Other bond securities		0	0
Recurring Basis | Level 2
Fair Value, Assets Measured on Recurring Basis
Bonds available for sale		244,506	224,960
Other bond securities		2,593	2,944
Equity securities		76	77
Other invested assets		102	86
Derivative Assets, Fair Value, Gross		6,580	4,826
Short-term investments		3,589	3,044
Other assets		0	2,212
Separate account assets, at fair value		3,730	4,203
Fair value assets measured on recurring basis, total		261,176	242,352
Fair Value, Liabilities Measured on Recurring Basis
Policyholder contract deposits, portion measured at fair value		0	0
Derivative Liabilities, Fair Value, Gross		5,710	3,905
Fortitude Re funds withheld payable		0
Other liabilities		1	45
Long-term debt		2,097	2,062
Fair value liabilities measured on recurring basis, total		7,808	6,012
Recurring Basis | Level 2 | Interest rate contracts
Fair Value, Assets Measured on Recurring Basis
Derivative Assets, Fair Value, Gross		4,637	3,199
Fair Value, Liabilities Measured on Recurring Basis
Derivative Liabilities, Fair Value, Gross		4,435	2,745
Recurring Basis | Level 2 | Foreign exchange contracts
Fair Value, Assets Measured on Recurring Basis
Derivative Assets, Fair Value, Gross		1,020	1,034
Fair Value, Liabilities Measured on Recurring Basis
Derivative Liabilities, Fair Value, Gross		1,090	1,025
Recurring Basis | Level 2 | Equity contracts
Fair Value, Assets Measured on Recurring Basis
Derivative Assets, Fair Value, Gross		923	593
Fair Value, Liabilities Measured on Recurring Basis
Derivative Liabilities, Fair Value, Gross		162	111
Recurring Basis | Level 2 | Credit contracts
Fair Value, Assets Measured on Recurring Basis
Derivative Assets, Fair Value, Gross		0	0
Fair Value, Liabilities Measured on Recurring Basis
Derivative Liabilities, Fair Value, Gross		23	24
Recurring Basis | Level 2 | Other contracts
Fair Value, Assets Measured on Recurring Basis
Derivative Assets, Fair Value, Gross		0	0
Fair Value, Liabilities Measured on Recurring Basis
Derivative Liabilities, Fair Value, Gross		0	0
Recurring Basis | Level 2 | U.S. government and government sponsored entities
Fair Value, Assets Measured on Recurring Basis
Bonds available for sale		4,053	5,245
Other bond securities		1,845	2,121
Recurring Basis | Level 2 | Obligations of states, municipalities and political subdivisions
Fair Value, Assets Measured on Recurring Basis
Bonds available for sale		14,019	13,197
Recurring Basis | Level 2 | Non-U.S. governments
Fair Value, Assets Measured on Recurring Basis
Bonds available for sale		15,312	14,809
Other bond securities		0	0
Recurring Basis | Level 2 | Corporate debt
Fair Value, Assets Measured on Recurring Basis
Bonds available for sale		166,949	147,973
Other bond securities		12	18
Recurring Basis | Level 2 | Residential mortgage-backed securities (RMBS)
Fair Value, Assets Measured on Recurring Basis
Bonds available for sale		19,771	19,397
Other bond securities		290	346
Recurring Basis | Level 2 | Commercial mortgage-backed securities (CMBS)
Fair Value, Assets Measured on Recurring Basis
Bonds available for sale		15,211	13,377
Other bond securities		273	272
Recurring Basis | Level 2 | Collateralized Debt Obligations/Asset Backed Securities (CDO/ABS)
Fair Value, Assets Measured on Recurring Basis
Bonds available for sale		9,191	10,962
Other bond securities		173	187
Recurring Basis | Level 3
Fair Value, Assets Measured on Recurring Basis
Bonds available for sale		26,889	25,931
Other bond securities		2,698	3,738
Equity securities		51	8
Other invested assets		1,827	1,192
Derivative Assets, Fair Value, Gross		216	194
Short-term investments		0	0
Other assets		113	89
Separate account assets, at fair value		0	0
Fair value assets measured on recurring basis, total		31,794	31,152
Fair Value, Liabilities Measured on Recurring Basis
Policyholder contract deposits, portion measured at fair value		9,798	6,910
Derivative Liabilities, Fair Value, Gross		97	92
Fortitude Re funds withheld payable		6,042
Other liabilities		0	0
Long-term debt		0	0
Fair value liabilities measured on recurring basis, total		15,937	7,002
Recurring Basis | Level 3 | Interest rate contracts
Fair Value, Assets Measured on Recurring Basis
Derivative Assets, Fair Value, Gross		0	0
Fair Value, Liabilities Measured on Recurring Basis
Derivative Liabilities, Fair Value, Gross		0	0
Recurring Basis | Level 3 | Foreign exchange contracts
Fair Value, Assets Measured on Recurring Basis
Derivative Assets, Fair Value, Gross		2	6
Fair Value, Liabilities Measured on Recurring Basis
Derivative Liabilities, Fair Value, Gross		0	0
Recurring Basis | Level 3 | Equity contracts
Fair Value, Assets Measured on Recurring Basis
Derivative Assets, Fair Value, Gross		198	171
Fair Value, Liabilities Measured on Recurring Basis
Derivative Liabilities, Fair Value, Gross		47	20
Recurring Basis | Level 3 | Credit contracts
Fair Value, Assets Measured on Recurring Basis
Derivative Assets, Fair Value, Gross		2	3
Fair Value, Liabilities Measured on Recurring Basis
Derivative Liabilities, Fair Value, Gross		44	65
Recurring Basis | Level 3 | Other contracts
Fair Value, Assets Measured on Recurring Basis
Derivative Assets, Fair Value, Gross		14	14
Fair Value, Liabilities Measured on Recurring Basis
Derivative Liabilities, Fair Value, Gross		6	7
Recurring Basis | Level 3 | U.S. government and government sponsored entities
Fair Value, Assets Measured on Recurring Basis
Bonds available for sale		0	0
Other bond securities		0	0
Recurring Basis | Level 3 | Obligations of states, municipalities and political subdivisions
Fair Value, Assets Measured on Recurring Basis
Bonds available for sale		2,105	2,121
Recurring Basis | Level 3 | Non-U.S. governments
Fair Value, Assets Measured on Recurring Basis
Bonds available for sale		5	0
Other bond securities		0	0
Recurring Basis | Level 3 | Corporate debt
Fair Value, Assets Measured on Recurring Basis
Bonds available for sale		2,349	1,663
Other bond securities		0	0
Recurring Basis | Level 3 | Residential mortgage-backed securities (RMBS)
Fair Value, Assets Measured on Recurring Basis
Bonds available for sale		11,694	13,408
Other bond securities		139	143
Recurring Basis | Level 3 | Commercial mortgage-backed securities (CMBS)
Fair Value, Assets Measured on Recurring Basis
Bonds available for sale		922	1,053
Other bond securities		47	50
Recurring Basis | Level 3 | Collateralized Debt Obligations/Asset Backed Securities (CDO/ABS)
Fair Value, Assets Measured on Recurring Basis
Bonds available for sale		9,814	7,686
Other bond securities		$ 2,512	$ 3,545

[1] See Note 10 for details of balances associated with variable interest entities.