LENDING ACTIVITIES (Details - Credit quality indicators for commercial mortgage loans) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2018 USD ($) loan	Dec. 31, 2017 USD ($) loan	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Commercial Mortgage Recorded Investment [Line Items]
Mortgage and other loans receivable, net	$ 38,540	$ 37,023
Allowance for credit losses	347	322	$ 289	$ 297
Total mortgage and other loans receivable	$ 38,887	$ 37,345
Debt Coverage Ratio	2	2.1
Average Loan to Value Ratio	61.00%	57.00%
Apartments
Commercial Mortgage Recorded Investment [Line Items]
In good standing	$ 8,790	$ 8,163
Restructured	0	0
90 days or less delinquent	0	0
Greater than 90 days delinquent or in process of foreclosure	0	0
Allowance for credit losses, Specific	0	0
Allowance for credit losses, General	79	72
Allowance for credit losses	79	72
Total mortgage and other loans receivable	8,790	8,163
Offices
Commercial Mortgage Recorded Investment [Line Items]
In good standing	8,633	8,585
Restructured	115	115
90 days or less delinquent	0	0
Greater than 90 days delinquent or in process of foreclosure	0	0
Allowance for credit losses, Specific	3	3
Allowance for credit losses, General	95	94
Allowance for credit losses	98	97
Total mortgage and other loans receivable	8,748	8,700
Retail
Commercial Mortgage Recorded Investment [Line Items]
In good standing	5,190	5,338
Restructured	23	23
90 days or less delinquent	0	0
Greater than 90 days delinquent or in process of foreclosure	0	0
Allowance for credit losses, Specific	20	1
Allowance for credit losses, General	34	37
Allowance for credit losses	54	38
Total mortgage and other loans receivable	5,213	5,361
Industrial
Commercial Mortgage Recorded Investment [Line Items]
In good standing	2,573	2,023
Restructured	0	0
90 days or less delinquent	0	0
Greater than 90 days delinquent or in process of foreclosure	0	0
Allowance for credit losses, Specific	0	0
Allowance for credit losses, General	9	6
Allowance for credit losses	9	6
Total mortgage and other loans receivable	2,573	2,023
Hotel
Commercial Mortgage Recorded Investment [Line Items]
In good standing	2,365	2,373
Restructured	16	16
90 days or less delinquent	0	0
Greater than 90 days delinquent or in process of foreclosure	0	0
Allowance for credit losses, Specific	1	1
Allowance for credit losses, General	16	15
Allowance for credit losses	17	16
Total mortgage and other loans receivable	2,381	2,389
Others
Commercial Mortgage Recorded Investment [Line Items]
In good standing	1,994	1,960
Restructured	0	0
90 days or less delinquent	0	0
Greater than 90 days delinquent or in process of foreclosure	0	0
Allowance for credit losses, Specific	0	0
Allowance for credit losses, General	17	18
Allowance for credit losses	17	18
Total mortgage and other loans receivable	$ 1,994	$ 1,960
Commercial mortgages
Commercial Mortgage Recorded Investment [Line Items]
Number of loans in good standing | loan	775	778
Number of loans restructured | loan	5	5
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	780	783
In good standing	$ 29,545	$ 28,442
Restructured	154	154
90 days or less delinquent	0	0
Greater than 90 days delinquent or in process of foreclosure	0	0
Allowance for credit losses, Specific	24	5
Allowance for credit losses, General	250	242
Allowance for credit losses	$ 274	$ 247
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 allowance for losses	1.00%	1.00%
Total mortgage and other loans receivable	$ 29,699	$ 28,596
Commercial mortgages | Greater than 1.2x
Commercial Mortgage Recorded Investment [Line Items]
Total mortgage and other loans receivable	26,574	26,023
Commercial mortgages | 1.00X - 1.20X
Commercial Mortgage Recorded Investment [Line Items]
Total mortgage and other loans receivable	2,524	1,964
Commercial mortgages | Less than 1.00X
Commercial Mortgage Recorded Investment [Line Items]
Total mortgage and other loans receivable	601	609
Commercial mortgages | Less than 65%
Commercial Mortgage Recorded Investment [Line Items]
Total mortgage and other loans receivable	19,976	19,876
Commercial mortgages | Less than 65% | Greater than 1.2x
Commercial Mortgage Recorded Investment [Line Items]
Total mortgage and other loans receivable	17,506	18,000
Commercial mortgages | Less than 65% | 1.00X - 1.20X
Commercial Mortgage Recorded Investment [Line Items]
Total mortgage and other loans receivable	2,121	1,525
Commercial mortgages | Less than 65% | Less than 1.00X
Commercial Mortgage Recorded Investment [Line Items]
Total mortgage and other loans receivable	349	351
Commercial mortgages | 65% to 75%
Commercial Mortgage Recorded Investment [Line Items]
Total mortgage and other loans receivable	7,611	6,415
Commercial mortgages | 65% to 75% | Greater than 1.2x
Commercial Mortgage Recorded Investment [Line Items]
Total mortgage and other loans receivable	7,240	6,038
Commercial mortgages | 65% to 75% | 1.00X - 1.20X
Commercial Mortgage Recorded Investment [Line Items]
Total mortgage and other loans receivable	192	193
Commercial mortgages | 65% to 75% | Less than 1.00X
Commercial Mortgage Recorded Investment [Line Items]
Total mortgage and other loans receivable	179	184
Commercial mortgages | 76% to 80%
Commercial Mortgage Recorded Investment [Line Items]
Total mortgage and other loans receivable	943	609
Commercial mortgages | 76% to 80% | Greater than 1.2x
Commercial Mortgage Recorded Investment [Line Items]
Total mortgage and other loans receivable	943	569
Commercial mortgages | 76% to 80% | 1.00X - 1.20X
Commercial Mortgage Recorded Investment [Line Items]
Total mortgage and other loans receivable	0	40
Commercial mortgages | 76% to 80% | Less than 1.00X
Commercial Mortgage Recorded Investment [Line Items]
Total mortgage and other loans receivable	0	0
Commercial mortgages | Greater than 80%
Commercial Mortgage Recorded Investment [Line Items]
Total mortgage and other loans receivable	1,169	1,696
Commercial mortgages | Greater than 80% | Greater than 1.2x
Commercial Mortgage Recorded Investment [Line Items]
Total mortgage and other loans receivable	885	1,416
Commercial mortgages | Greater than 80% | 1.00X - 1.20X
Commercial Mortgage Recorded Investment [Line Items]
Total mortgage and other loans receivable	211	206
Commercial mortgages | Greater than 80% | Less than 1.00X
Commercial Mortgage Recorded Investment [Line Items]
Total mortgage and other loans receivable	$ 73	$ 74