INSURANCE LIABILITIES (Details - Liability for Unpaid Losses and Loss Adjustment Expenses) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Jan. 20, 2017
Supplementary Insurance Information, by Segment [Line Items]
Contractual deductible recoverable amount	$ 12,500		$ 12,600
Collateral Held For Deductible Recoverable Amounts	9,200		9,200
Allowance for credit losses for unsecured reinsurance recoverable	14		$ 14
Reconciliation of activity in the Liability for unpaid claims and claims adjustment expense:
Liability for unpaid loss and loss adjustment expenses, beginning of period	77,720	$ 78,328
Reinsurance recoverable, balance at the beginning of the period	(34,431)	(31,069)
Initial allowance upon CECL adoption	0	164
Net Liability for unpaid loss and loss adjustment expenses, beginning of period	43,289	47,423
Losses and loss adjustment expenses incurred
Current year	3,925	4,111
Prior years, excluding discount and amortization of deferred gain	16	(1)
Prior years, discount charge (benefit)	(18)	76
Prior years, amortization of deferred gain on retroactive reinsurance	(72)	(75)
Total losses and loss adjustment expenses incurred	3,851	4,111
Losses and loss adjustment expenses paid
Current year	(328)	(342)
Prior years	(3,584)	(4,351)
Total losses and loss adjustment expenses paid	(3,912)	(4,693)
Other changes:
Foreign exchange effect	244	(230)
Allowance for credit losses	0	0
Retroactive reinsurance adjustment (net of discount)	89	22
Total other changes	333	(208)
Net liability for unpaid losses and loss adjustment expenses, end of period	43,561	46,633
Reinsurance recoverable, balance at the end of the period	35,271	31,114
Total, balance at the end of period	78,832	77,747
Change in discount on loss reserves ceded under retroactive reinsurance	39	72
U.S. Commercial long-tail exposures | NICO | Accident Years 2015 and Prior
Other changes:
Discount on retroactive reinsurance	$ 17	$ 8
Risk Transferred - U.S. Commercial long-tail exposures for accident years 2015 and prior, percent				80.00%
Reinsurance Percent Ceded on Paid Losses Percent				80.00%
Ceded to NICO net paid losses in excess				$ 25,000
Ceded to NICO net paid losses in excess, aggregate limit				25,000
NICO's limit of liability under the contract				20,000
Consideration paid, including interest				$ 10,200