INSURANCE LIABILITIES (Details - Narratives) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Insurance Liabilities Disclosure [Line Items]
Gross Loss Reserves Before Reinsurance and Discount Net of Subrogation	$ 12,300				$ 12,600				$ 12,300	$ 12,600
Collateral Held For Deductible Recoverable Amounts	9,200				9,500				9,200	9,500
Total prior year (favourable) unfavorable development	546	$ 949	$ (26)	$ (40)	212	$ 901	$ 391	$ 61
Liability for Claims and Claims Adjustment Expense	83,639				78,393				83,639	78,393	$ 77,077	$ 74,942
Net liability for unpaid losses and loss adjustment expenses as presented in the disaggregated tables below (Last 10 Years)	51,949				51,685				51,949	51,685	61,545	$ 60,603
Discounting Of Loss Reserves [Abstract]
Loss Reserve Discount	2,035				1,844				$ 2,035	1,844
Tabular Discount Rate									3.50%
Workers Compensation Tabular Discount Amount	603								$ 603
Workers Compensation Non Tabular Discount Amount	1,400								1,400
(Increase) Decrease in Loss Reserve Discount									371	(187)	422
Effective Interest Rates
Discounting Of Loss Reserves [Abstract]
(Increase) Decrease in Loss Reserve Discount									(418)	71	106
U.S. Workers Compensation
Insurance Liabilities Disclosure [Line Items]
Total prior year (favourable) unfavorable development									51	(31)	1,900
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											0
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									1,274	254	1,100
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										0	250
U.S. Excess Casualty | Bad-Faith claims
Insurance Liabilities Disclosure [Line Items]
Liability for Claims and Claims Adjustment Expense											0
U.S. Other Casualty
Insurance Liabilities Disclosure [Line Items]
Total prior year (favourable) unfavorable development									(127)	216	1,600
U.S. Other Casualty | Commercial Auto Liability
Insurance Liabilities Disclosure [Line Items]
Total prior year (favourable) unfavorable development									(142)	42	352
U.S. Other Casualty | General Liability
Insurance Liabilities Disclosure [Line Items]
Total prior year (favourable) unfavorable development									214	330	754
U.S. Other Casualty | Medical Malpractice
Insurance Liabilities Disclosure [Line Items]
Total prior year (favourable) unfavorable development									(158)	(23)	428
U.S. Other Casualty | Other Product Lines
Insurance Liabilities Disclosure [Line Items]
Total prior year (favourable) unfavorable development									(41)	(133)	50
U.S. Other Casualty | Ultimate loss Expense Estimate
Insurance Liabilities Disclosure [Line Items]
Total prior year (favourable) unfavorable development											0
U.S. Other Casualty | General Liability Ultimate loss Expense Estimate
Insurance Liabilities Disclosure [Line Items]
Total prior year (favourable) unfavorable development											0
U.S. Financial Lines
Insurance Liabilities Disclosure [Line Items]
Total prior year (favourable) unfavorable development									298	345	306
U.S. Property and Special Risks
Insurance Liabilities Disclosure [Line Items]
Total prior year (favourable) unfavorable development									(497)	115	396
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									255	16	(32)
Europe Casualty and Financial Lines
Insurance Liabilities Disclosure [Line Items]
Total prior year (favourable) unfavorable development									58	507	320
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									(22)	157	11
Europe and Japan Personal Insurance
Insurance Liabilities Disclosure [Line Items]
Total prior year (favourable) unfavorable development									(116)	(58)	(82)
U.S. Commercial long-tail exposures
Insurance Liabilities Disclosure [Line Items]
Total prior year (favourable) unfavorable development									(4)	(30)	390
U.S. Commercial long-tail exposures | Asbestos
Insurance Liabilities Disclosure [Line Items]
Total prior year (favourable) unfavorable development										(37)
Increase (Decrease) in loss reserves, gross										0	106
Increase (Decrease) in loss reserves, net										0	(20)
U.S. Commercial long-tail exposures | Asbestos | NICO
Insurance Liabilities Disclosure [Line Items]
Increase (Decrease) in loss reserves, gross									96	50
Increase (Decrease) in loss reserves, net									0
U.S. Commercial long-tail exposures | Environmental
Insurance Liabilities Disclosure [Line Items]
Total prior year (favourable) unfavorable development									150	22
Increase (Decrease) in loss reserves, gross										0	211
Increase (Decrease) in loss reserves, net											0
U.S. Commercial long-tail exposures | Run-off excess workers compensation lines
Insurance Liabilities Disclosure [Line Items]
Total prior year (favourable) unfavorable development									0	0	0
U.S. Commercial long-tail exposures | Other Casualty Run-Off
Insurance Liabilities Disclosure [Line Items]
Total prior year (favourable) unfavorable development									(154)	(15)	190
Legacy General Insrance Run-Off Lines
Discounting Of Loss Reserves [Abstract]
Loss Reserve Discount	$ 973				$ 918				973	918
(Increase) Decrease in Loss Reserve Discount									$ 55	$ (69)	$ 16