REINSURANCE (Details - Short-Duration Reinsurance) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Premiums earned:
Net	$ 31,374	$ 34,393	$ 36,655
Short-duration insurance
Premiums Written
Direct	30,205	33,970	37,698
Assumed	3,084	2,824	2,972
Ceded	(7,533)	(7,561)	(7,604)
Net Amount	25,756	29,233	33,066
Premiums earned:
Direct	30,904	34,869	37,105
Assumed	3,373	2,962	2,659
Ceded	(7,902)	(7,284)	(7,593)
Net	26,375	30,547	32,171
Reinsurance recoveries, which reduced policyholder benefits and claims incurred	1,500	2,100	4,100
Ceded loss reserves under retroactive agreements	13,400	1,700
Deferred Gain (Loss) Retroactive Reinsurance	1,600	384
Effect on income from amortization of the deferred gain	$ 316	$ 30	$ 8
Short-duration insurance | NICO
Premiums earned:
Transfer of reserve, percent	80.00%
Ceded losses paid, percent	80.00%
Ceded losses paid aggregate limit, net	$ 20,000
Covered losses ceded	13,100
Unexpired Limit	6,900
Total consideration paid, including interest	10,200
Short-duration insurance | NICO | Maximum
Premiums earned:
Ceded losses paid in excess, net	25,000
Ceded losses paid aggregate limit, net	$ 25,000