INSURANCE LIABILITIES (Details - Narratives) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Insurance Liabilities Disclosure [Line Items]
Gross Loss Reserves Before Reinsurance and Discount Net of Subrogation	$ 12,600				$ 12,800				$ 12,600	$ 12,800
Collateral Held For Deductible Recoverable Amounts	9,500				9,700				9,500	9,700
Total prior year (favourable) unfavorable development	212	$ 901	$ 391	$ 61	5,574	$ 273	$ 7	$ (66)
Liability for Claims and Claims Adjustment Expense	78,393				77,077				78,393	77,077	$ 74,942	$ 77,260
Net liability for unpaid losses and loss adjustment expenses as presented in the disaggregated tables below (Last 10 Years)	51,685				61,545				51,685	61,545	60,603	$ 61,612
Discounting Of Loss Reserves [Abstract]
Loss Reserve Discount	1,844				3,570				1,844	$ 3,570
Tabular Discount Rate										3.50%
Workers Compensation Tabular Discount Amount	622								622
Workers Compensation Non Tabular Discount Amount	1,222								1,222
(Increase) Decrease in Loss Reserve Discount									(187)	$ 422	71
Effective Interest Rates
Discounting Of Loss Reserves [Abstract]
(Increase) Decrease in Loss Reserve Discount									71	106	(225)
U.S. Workers Compensation
Insurance Liabilities Disclosure [Line Items]
Total prior year (favourable) unfavorable development									(31)	1,900	234
Discounting Of Loss Reserves [Abstract]
(Increase) Decrease in Loss Reserve Discount									(1,657)
U.S. Workers Compensation | Risk sharing programs
Insurance Liabilities Disclosure [Line Items]
Actual loss emergence and development coverage in excess of large deductibles										1
U.S. Workers Compensation | Florida Court Ruling
Insurance Liabilities Disclosure [Line Items]
Increase (Decrease) in loss reserves, net										100
U.S. Workers Compensation | US and Non US Military Program
Insurance Liabilities Disclosure [Line Items]
Total prior year (favourable) unfavorable development											100
U.S. Workers Compensation | Ultimate Losses
Insurance Liabilities Disclosure [Line Items]
Total prior year (favourable) unfavorable development										440
U.S. Excess Casualty
Insurance Liabilities Disclosure [Line Items]
Total prior year (favourable) unfavorable development									254	1,100	1,400
Analysis of loss reserves using traditional loss development and expected loss ratio methods									10
Analysis of Loss reserves for expected losses above threshold									10
U.S. Excess Casualty | Commercial Auto Liability
Insurance Liabilities Disclosure [Line Items]
Total prior year (favourable) unfavorable development										250	411
U.S. Excess Casualty | Bad-Faith claims
Insurance Liabilities Disclosure [Line Items]
Liability for Claims and Claims Adjustment Expense											120
U.S. Other Casualty
Insurance Liabilities Disclosure [Line Items]
Total prior year (favourable) unfavorable development									216	1,600	1,400
U.S. Other Casualty | Commercial Auto Liability
Insurance Liabilities Disclosure [Line Items]
Total prior year (favourable) unfavorable development									42	352	105
U.S. Other Casualty | General Liability
Insurance Liabilities Disclosure [Line Items]
Total prior year (favourable) unfavorable development									330	754	172
U.S. Other Casualty | Medical Malpractice
Insurance Liabilities Disclosure [Line Items]
Total prior year (favourable) unfavorable development									(23)	428	202
U.S. Other Casualty | Other Product Lines
Insurance Liabilities Disclosure [Line Items]
Total prior year (favourable) unfavorable development									(133)	50	514
U.S. Other Casualty | Ultimate loss Expense Estimate
Insurance Liabilities Disclosure [Line Items]
Total prior year (favourable) unfavorable development											214
U.S. Other Casualty | General Liability Ultimate loss Expense Estimate
Insurance Liabilities Disclosure [Line Items]
Total prior year (favourable) unfavorable development											100
U.S. Financial Lines
Insurance Liabilities Disclosure [Line Items]
Total prior year (favourable) unfavorable development									345	306	502
U.S. Property and Special Risks
Insurance Liabilities Disclosure [Line Items]
Total prior year (favourable) unfavorable development									115	396	(132)
U.S. Property and Special Risks | U.S. program business
Insurance Liabilities Disclosure [Line Items]
Total prior year (favourable) unfavorable development										350
U.S. Personal Insurance
Insurance Liabilities Disclosure [Line Items]
Total prior year (favourable) unfavorable development									16	(32)	(69)
Europe Casualty and Financial Lines
Insurance Liabilities Disclosure [Line Items]
Total prior year (favourable) unfavorable development									507	320	142
Europe Casualty and Financial Lines | Europe Casualty Lines
Insurance Liabilities Disclosure [Line Items]
Total prior year (favourable) unfavorable development										123
Europe Casualty and Financial Lines | D&O line UK and Continental Europe
Insurance Liabilities Disclosure [Line Items]
Total prior year (favourable) unfavorable development										232
Europe Property and Special Risks
Insurance Liabilities Disclosure [Line Items]
Total prior year (favourable) unfavorable development									157	11	4
Europe and Japan Personal Insurance
Insurance Liabilities Disclosure [Line Items]
Total prior year (favourable) unfavorable development									(58)	(82)	15
U.S. Run-Off Long Tail Insurance Lines
Insurance Liabilities Disclosure [Line Items]
Total prior year (favourable) unfavorable development									(30)	390
U.S. Run-Off Long Tail Insurance Lines | Asbestos
Insurance Liabilities Disclosure [Line Items]
Total prior year (favourable) unfavorable development									(37)
Increase (Decrease) in loss reserves, gross										106	13
Increase (Decrease) in loss reserves, net										(20)	164
U.S. Run-Off Long Tail Insurance Lines | Asbestos | NICO
Insurance Liabilities Disclosure [Line Items]
Increase (Decrease) in loss reserves, gross									50
Increase (Decrease) in loss reserves, net									0
U.S. Run-Off Long Tail Insurance Lines | Environmental
Insurance Liabilities Disclosure [Line Items]
Total prior year (favourable) unfavorable development									22
Increase (Decrease) in loss reserves, gross										211	214
Increase (Decrease) in loss reserves, net											117
U.S. Run-Off Long Tail Insurance Lines | Run-off excess workers compensation lines
Insurance Liabilities Disclosure [Line Items]
Total prior year (favourable) unfavorable development									0	0	0
U.S. Run-Off Long Tail Insurance Lines | Other Casualty Run-Off
Insurance Liabilities Disclosure [Line Items]
Total prior year (favourable) unfavorable development									(15)	190	636
Legacy General Insrance Run-Off Lines
Discounting Of Loss Reserves [Abstract]
Loss Reserve Discount	$ 918				$ 987				918	987
(Increase) Decrease in Loss Reserve Discount									$ (69)	$ 16	$ 3