REINSURANCE (Details - Short-Duration Reinsurance) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Premiums earned:
Net		$ 30,614	$ 31,374	$ 34,393
Short-duration insurance
Premiums Written
Direct		30,335	30,205	33,970
Assumed		4,026	3,084	2,824
Ceded		(7,755)	(7,533)	(7,561)
Net Amount		26,606	25,756	29,233
Premiums earned:
Direct		31,415	30,904	34,869
Assumed		4,593	3,373	2,962
Ceded		(8,163)	(7,902)	(7,284)
Net		27,845	26,375	30,547
Reinsurance recoveries, which reduced policyholder benefits and claims incurred		9,800	1,500	2,100
Ceded loss reserves under retroactive agreements		13,800	13,400
Deferred Gain (Loss) Retroactive Reinsurance		1,800	1,600
Effect on income from amortization of the deferred gain		394	$ 316	$ 30
Short-duration insurance | NICO
Premiums earned:
Transfer of reserve, percent	80.00%
Ceded losses paid, percent	80.00%
Short-duration insurance | NICO | Maximum
Premiums earned:
Ceded losses paid in excess, net		25,000
Ceded losses paid aggregate limit, net		$ 25,000