INSURANCE LIABILITIES (Details - Liability for Unpaid Losses and Loss Adjustment Expenses) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Supplementary Insurance Information, by Segment [Line Items]
Collateral Held For Deductible Recoverable Amounts	$ 9,200	$ 8,900
Allowance for credit losses for unsecured reinsurance recoverable	14	0
Gross loss reserves before reinsurance and discount, net of contractual deductible recoverable amounts due from policyholders	12,600	12,200
Reconciliation of activity in the Liability for unpaid claims and claims adjustment expense:
Liability for unpaid loss and loss adjustment expenses, beginning of year	78,328	83,639	$ 78,393
Reinsurance recoverable, balance at the beginning of the year	(31,069)	(31,690)	(26,708)
Initial allowance upon CECL adoption	164	0	0
Net Liability for unpaid loss and loss adjustment expenses, beginning of year	47,259	51,949	51,685
Losses and loss adjustment expenses incurred
Current year	16,928	17,596	20,534
Prior years, excluding discount and amortization of deferred gain	(90)	(340)	1,429
Prior years, discount charge (benefit)	587	1,063	(252)
Prior years, amortization of deferred gain on retroactive reinsurance	(237)	(219)	(395)
Total losses and loss adjustment expenses incurred	17,188	18,100	21,316
Losses and loss adjustment expenses paid
Current year	(4,062)	(4,894)	(5,754)
Prior years	(14,603)	(18,020)	(17,768)
Total losses and loss adjustment expenses paid	(18,665)	(22,914)	(23,522)
Other changes:
Foreign exchange effect	815	(6)	(677)
Allowance for credit losses	(15)	0	0
Acquisitions	0	0	3,284
Retroactive reinsurance adjustment (net of discount)	361	130	(137)
Fortitude sale	(3,818)	0	0
Total other changes	(2,657)	124	2,470
Net liability for unpaid losses and loss adjustment expenses, end of year	43,289	47,259	51,949
Reinsurance recoverable, balance at the end of the year	34,431	31,069	31,690
Total, balance at the end of year	77,720	78,328	83,639
Change in discount on loss reserves ceded under retroactive reinsurance	340	469	(180)
Adjusted balance
Reconciliation of activity in the Liability for unpaid claims and claims adjustment expense:
Net Liability for unpaid loss and loss adjustment expenses, beginning of year	47,423
Other changes:
Net liability for unpaid losses and loss adjustment expenses, end of year		47,423
U.S. Asbestos | NICO
Losses and loss adjustment expenses incurred
Prior years, discount charge (benefit)	$ 41	$ 27	$ 51