LENDING ACTIVITIES (Details - Credit quality indicators for commercial mortgage loans) $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($) loan	Dec. 31, 2016 USD ($) loan	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Commercial Mortgage Recorded Investment [Line Items]
Mortgage and other loans receivable, net	$ 37,023	$ 33,240
Allowance for credit losses	322	297	$ 308	$ 271
Total mortgage and other loans receivable	37,345	33,537
Apartments
Commercial Mortgage Recorded Investment [Line Items]
In good standing	8,163	6,005
Restructured	0	0
90 days or less delinquent	0	0
Greater than 90 days delinquent or in process of foreclosure	0	0
Mortgage and other loans receivable, net	8,163	6,005
Allowance for credit losses, Specific	0	0
Allowance for credit losses, General	72	35
Allowance for credit losses	72	35
Offices
Commercial Mortgage Recorded Investment [Line Items]
In good standing	8,585	7,830
Restructured	115	134
90 days or less delinquent	0	0
Greater than 90 days delinquent or in process of foreclosure	0	0
Mortgage and other loans receivable, net	8,700	7,964
Allowance for credit losses, Specific	3	3
Allowance for credit losses, General	94	72
Allowance for credit losses	97	75
Retail
Commercial Mortgage Recorded Investment [Line Items]
In good standing	5,338	5,179
Restructured	23	18
90 days or less delinquent	0	0
Greater than 90 days delinquent or in process of foreclosure	0	0
Mortgage and other loans receivable, net	5,361	5,197
Allowance for credit losses, Specific	1	1
Allowance for credit losses, General	37	41
Allowance for credit losses	38	42
Industrial
Commercial Mortgage Recorded Investment [Line Items]
In good standing	2,023	1,898
Restructured	0	0
90 days or less delinquent	0	0
Greater than 90 days delinquent or in process of foreclosure	0	0
Mortgage and other loans receivable, net	2,023	1,898
Allowance for credit losses, Specific	0	6
Allowance for credit losses, General	6	7
Allowance for credit losses	6	13
Hotel
Commercial Mortgage Recorded Investment [Line Items]
In good standing	2,373	2,373
Restructured	16	16
90 days or less delinquent	0	0
Greater than 90 days delinquent or in process of foreclosure	0	0
Mortgage and other loans receivable, net	2,389	2,389
Allowance for credit losses, Specific	1	1
Allowance for credit losses, General	15	13
Allowance for credit losses	16	14
Others
Commercial Mortgage Recorded Investment [Line Items]
In good standing	1,960	1,589
Restructured	0	0
90 days or less delinquent	0	0
Greater than 90 days delinquent or in process of foreclosure	0	0
Mortgage and other loans receivable, net	1,960	1,589
Allowance for credit losses, Specific	0	0
Allowance for credit losses, General	18	15
Allowance for credit losses	$ 18	$ 15
Commercial mortgages
Commercial Mortgage Recorded Investment [Line Items]
Number of loans in good standing | loan	778	784
Number of loans restructured | loan	5	4
Number of loans 90 days or less delinquent | loan	0	0
Number of loans greater than 90 days delinquent or in process of foreclosure | loan	0	0
Number of Loans | loan	783	788
In good standing	$ 28,442	$ 24,874
Restructured	154	168
90 days or less delinquent	0	0
Greater than 90 days delinquent or in process of foreclosure	0	0
Mortgage and other loans receivable, net	28,596	25,042
Allowance for credit losses, Specific	5	11
Allowance for credit losses, General	242	183
Allowance for credit losses	$ 247	$ 194
Percentage of loans that are current as to payments of principal and interest	99.00%	99.00%
Percentage restructured	1.00%	1.00%
Percentage 90 days or less delinquent	0.00%
Percentage greater than 90 days delinquent or in foreclosure	0.00%	0.00%
Percentage Total	100.00%	100.00%
Percentage of loans with valuation allowance, Genaral	1.00%	1.00%
Percentage of loans with valuation allowance, Specific	0.00%	0.00%
Percentage of loans with allowance for losses	1.00%	1.00%
Percentage of current commercial mortgages held	100.00%
Total mortgage and other loans receivable	$ 28,596	$ 25,042
Commercial mortgages | Greater than 1.2x
Commercial Mortgage Recorded Investment [Line Items]
Total mortgage and other loans receivable	26,023	21,661
Commercial mortgages | 1.00X - 1.20X
Commercial Mortgage Recorded Investment [Line Items]
Total mortgage and other loans receivable	1,964	2,835
Commercial mortgages | Less than 1.00X
Commercial Mortgage Recorded Investment [Line Items]
Total mortgage and other loans receivable	609	546
Commercial mortgages | Less than 65%
Commercial Mortgage Recorded Investment [Line Items]
Total mortgage and other loans receivable	19,876	15,924
Commercial mortgages | Less than 65% | Greater than 1.2x
Commercial Mortgage Recorded Investment [Line Items]
Total mortgage and other loans receivable	18,000	13,998
Commercial mortgages | Less than 65% | 1.00X - 1.20X
Commercial Mortgage Recorded Investment [Line Items]
Total mortgage and other loans receivable	1,525	1,694
Commercial mortgages | Less than 65% | Less than 1.00X
Commercial Mortgage Recorded Investment [Line Items]
Total mortgage and other loans receivable	351	232
Commercial mortgages | 65% to 75%
Commercial Mortgage Recorded Investment [Line Items]
Total mortgage and other loans receivable	6,415	6,583
Commercial mortgages | 65% to 75% | Greater than 1.2x
Commercial Mortgage Recorded Investment [Line Items]
Total mortgage and other loans receivable	6,038	5,946
Commercial mortgages | 65% to 75% | 1.00X - 1.20X
Commercial Mortgage Recorded Investment [Line Items]
Total mortgage and other loans receivable	193	575
Commercial mortgages | 65% to 75% | Less than 1.00X
Commercial Mortgage Recorded Investment [Line Items]
Total mortgage and other loans receivable	184	62
Commercial mortgages | 76% to 80%
Commercial Mortgage Recorded Investment [Line Items]
Total mortgage and other loans receivable	609	1,467
Commercial mortgages | 76% to 80% | Greater than 1.2x
Commercial Mortgage Recorded Investment [Line Items]
Total mortgage and other loans receivable	569	1,246
Commercial mortgages | 76% to 80% | 1.00X - 1.20X
Commercial Mortgage Recorded Investment [Line Items]
Total mortgage and other loans receivable	40	174
Commercial mortgages | 76% to 80% | Less than 1.00X
Commercial Mortgage Recorded Investment [Line Items]
Total mortgage and other loans receivable	0	47
Commercial mortgages | Greater than 80%
Commercial Mortgage Recorded Investment [Line Items]
Total mortgage and other loans receivable	1,696	1,068
Commercial mortgages | Greater than 80% | Greater than 1.2x
Commercial Mortgage Recorded Investment [Line Items]
Total mortgage and other loans receivable	1,416	471
Commercial mortgages | Greater than 80% | 1.00X - 1.20X
Commercial Mortgage Recorded Investment [Line Items]
Total mortgage and other loans receivable	206	392
Commercial mortgages | Greater than 80% | Less than 1.00X
Commercial Mortgage Recorded Investment [Line Items]
Total mortgage and other loans receivable	$ 74	$ 205