LENDING ACTIVITIES (Details - Credit quality indicators for commercial mortgage loans) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2018 USD ($) loan	Dec. 31, 2017 USD ($) loan	Sep. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)
Commercial Mortgage Recorded Investment [Line Items]
Mortgage and other loans receivable, net	$ 41,878	$ 37,023
Allowance for credit losses	379	322	$ 345	$ 297
Total mortgage and other loans receivable	$ 42,257	$ 37,345
Debt Coverage Ratio	1.9	2.1
Average Loan to Value Ratio	58.00%	57.00%
Apartments
Commercial Mortgage Recorded Investment [Line Items]
In good standing	$ 10,393	$ 8,163
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	10,393	8,163
Allowance for credit losses, Specific	0	0
Allowance for credit losses, General	106	72
Allowance for credit losses	106	72
Offices
Commercial Mortgage Recorded Investment [Line Items]
In good standing	9,257	8,585
Restructured	113	115
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	9,370	8,700
Allowance for credit losses, Specific	2	3
Allowance for credit losses, General	96	94
Allowance for credit losses	98	97
Retail
Commercial Mortgage Recorded Investment [Line Items]
In good standing	5,333	5,338
Restructured	0	23
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	5,333	5,361
Allowance for credit losses, Specific	0	1
Allowance for credit losses, General	46	37
Allowance for credit losses	46	38
Industrial
Commercial Mortgage Recorded Investment [Line Items]
In good standing	3,002	2,023
Restructured	15	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	3,017	2,023
Allowance for credit losses, Specific	0	0
Allowance for credit losses, General	12	6
Allowance for credit losses	12	6
Hotel
Commercial Mortgage Recorded Investment [Line Items]
In good standing	2,531	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	2,547	2,389
Allowance for credit losses, Specific	1	1
Allowance for credit losses, General	19	15
Allowance for credit losses	20	16
Others
Commercial Mortgage Recorded Investment [Line Items]
In good standing	1,422	1,960
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	1,422	1,960
Allowance for credit losses, Specific	0	0
Allowance for credit losses, General	14	18
Allowance for credit losses	$ 14	$ 18
Commercial mortgages
Commercial Mortgage Recorded Investment [Line Items]
Number of loans in good standing | loan	763	778
Number of loans restructured | loan	4	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	767	783
In good standing	$ 31,938	$ 28,442
Restructured	144	154
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	32,082	28,596
Allowance for credit losses, Specific	3	5
Allowance for credit losses, General	293	242
Allowance for credit losses	$ 296	$ 247
Percentage of loans that are current as to payments of principal and interest	100.00%	99.00%
Percentage restructured	0.00%	1.00%
Percentage 90 days or less delinquent	0.00%	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, General	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%
Commercial mortgages | Less than 65% | Greater than 1.2x
Commercial Mortgage Recorded Investment [Line Items]
Total mortgage and other loans receivable	$ 17,986	$ 18,000
Commercial mortgages | Less than 65% | 1.00X - 1.20X
Commercial Mortgage Recorded Investment [Line Items]
Total mortgage and other loans receivable	2,508	1,525
Commercial mortgages | Less than 65% | Less than 1.00X
Commercial Mortgage Recorded Investment [Line Items]
Total mortgage and other loans receivable	239	351
Commercial mortgages | Less than 65% | Total
Commercial Mortgage Recorded Investment [Line Items]
Total mortgage and other loans receivable	20,733	19,876
Commercial mortgages | 65% to 75% | Greater than 1.2x
Commercial Mortgage Recorded Investment [Line Items]
Total mortgage and other loans receivable	9,115	6,038
Commercial mortgages | 65% to 75% | 1.00X - 1.20X
Commercial Mortgage Recorded Investment [Line Items]
Total mortgage and other loans receivable	302	193
Commercial mortgages | 65% to 75% | Less than 1.00X
Commercial Mortgage Recorded Investment [Line Items]
Total mortgage and other loans receivable	258	184
Commercial mortgages | 65% to 75% | Total
Commercial Mortgage Recorded Investment [Line Items]
Total mortgage and other loans receivable	9,675	6,415
Commercial mortgages | 76% to 80% | Greater than 1.2x
Commercial Mortgage Recorded Investment [Line Items]
Total mortgage and other loans receivable	831	569
Commercial mortgages | 76% to 80% | 1.00X - 1.20X
Commercial Mortgage Recorded Investment [Line Items]
Total mortgage and other loans receivable	8	40
Commercial mortgages | 76% to 80% | Less than 1.00X
Commercial Mortgage Recorded Investment [Line Items]
Total mortgage and other loans receivable	15	0
Commercial mortgages | 76% to 80% | Total
Commercial Mortgage Recorded Investment [Line Items]
Total mortgage and other loans receivable	854	609
Commercial mortgages | Greater than 80% | Greater than 1.2x
Commercial Mortgage Recorded Investment [Line Items]
Total mortgage and other loans receivable	572	1,416
Commercial mortgages | Greater than 80% | 1.00X - 1.20X
Commercial Mortgage Recorded Investment [Line Items]
Total mortgage and other loans receivable	106	206
Commercial mortgages | Greater than 80% | Less than 1.00X
Commercial Mortgage Recorded Investment [Line Items]
Total mortgage and other loans receivable	142	74
Commercial mortgages | Greater than 80% | Total
Commercial Mortgage Recorded Investment [Line Items]
Total mortgage and other loans receivable	820	1,696
Commercial mortgages | Total | Greater than 1.2x
Commercial Mortgage Recorded Investment [Line Items]
Total mortgage and other loans receivable	28,504	26,023
Commercial mortgages | Total | 1.00X - 1.20X
Commercial Mortgage Recorded Investment [Line Items]
Total mortgage and other loans receivable	2,924	1,964
Commercial mortgages | Total | Less than 1.00X
Commercial Mortgage Recorded Investment [Line Items]
Total mortgage and other loans receivable	654	609
Commercial mortgages | Total | Total
Commercial Mortgage Recorded Investment [Line Items]
Total mortgage and other loans receivable	$ 32,082	$ 28,596