INVESTMENTS (MORTGAGE LOANS) (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
Sep. 30, 2017	Dec. 31, 2016
Commercial Mortgage Loans
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	$ 8,084	$ 7,264
Financing Receivable, Recorded Investment, Aging [Abstract]
Financing receivables, recorded investment, past due	0	0
Financing receivables, recorded investment, current	8,084	7,264
Total financing receivables	8,084	7,264
Financing receivable, recorded investment, 90 days or more past due and accruing	0	0
Commercial Mortgage Loans \| With No Related Allowance Recorded
Impaired Mortgage Loans [Abstract]
Impaired financing receivable, recorded investment	0	15
Impaired financing receivable, unpaid principal balance	0	15
Related allowance	0	0
Impaired financing receivable, average recorded investment	0	22
Impaired financing receivable, interest income recognized	0	0
Commercial Mortgage Loans \| With Related Allowance Recorded
Impaired Mortgage Loans [Abstract]
Impaired financing receivable, recorded investment	27	27
Impaired financing receivable, unpaid principal balance	27	27
Related allowance	(8)	(8)
Impaired financing receivable, average recorded investment	27	48
Impaired financing receivable, interest income recognized	1	2
Commercial Mortgage Loans \| Greater than 2.0x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	5,005	4,237
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	5,005	4,237
Commercial Mortgage Loans \| 1.8x to 2.0x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	555	590
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	555	590
Commercial Mortgage Loans \| 1.5x to 1.8x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	1,584	989
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	1,584	989
Commercial Mortgage Loans \| 1.2x to 1.5x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	744	1,298
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	744	1,298
Commercial Mortgage Loans \| 1.0x to 1.2x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	196	104
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	196	104
Commercial Mortgage Loans \| Less than 1.0x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	0	46
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	0	46
Commercial Mortgage Loans \| 0% - 50%
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	1,128	948
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	1,128	948
Commercial Mortgage Loans \| 0% - 50% \| Greater than 2.0x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	741	738
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	741	738
Commercial Mortgage Loans \| 0% - 50% \| 1.8x to 2.0x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	0	95
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	0	95
Commercial Mortgage Loans \| 0% - 50% \| 1.5x to 1.8x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	313	59
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	313	59
Commercial Mortgage Loans \| 0% - 50% \| 1.2x to 1.5x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	74	56
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	74	56
Commercial Mortgage Loans \| 0% - 50% \| 1.0x to 1.2x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	0	0
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	0	0
Commercial Mortgage Loans \| 0% - 50% \| Less than 1.0x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	0	0
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	0	0
Commercial Mortgage Loans \| 50% - 70%
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	6,259	5,496
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	6,259	5,496
Commercial Mortgage Loans \| 50% - 70% \| Greater than 2.0x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	4,094	3,217
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	4,094	3,217
Commercial Mortgage Loans \| 50% - 70% \| 1.8x to 2.0x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	555	430
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	555	430
Commercial Mortgage Loans \| 50% - 70% \| 1.5x to 1.8x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	1,048	673
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	1,048	673
Commercial Mortgage Loans \| 50% - 70% \| 1.2x to 1.5x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	416	1,100
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	416	1,100
Commercial Mortgage Loans \| 50% - 70% \| 1.0x to 1.2x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	146	76
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	146	76
Commercial Mortgage Loans \| 50% - 70% \| Less than 1.0x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	0	0
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	0	0
Commercial Mortgage Loans \| 70% - 90%
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	670	777
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	670	777
Commercial Mortgage Loans \| 70% - 90% \| Greater than 2.0x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	170	282
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	170	282
Commercial Mortgage Loans \| 70% - 90% \| 1.8x to 2.0x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	0	65
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	0	65
Commercial Mortgage Loans \| 70% - 90% \| 1.5x to 1.8x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	196	229
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	196	229
Commercial Mortgage Loans \| 70% - 90% \| 1.2x to 1.5x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	254	127
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	254	127
Commercial Mortgage Loans \| 70% - 90% \| 1.0x to 1.2x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	50	28
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	50	28
Commercial Mortgage Loans \| 70% - 90% \| Less than 1.0x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	0	46
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	0	46
Commercial Mortgage Loans \| 90% plus
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	27	43
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	27	43
Commercial Mortgage Loans \| 90% plus \| Greater than 2.0x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	0	0
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	0	0
Commercial Mortgage Loans \| 90% plus \| 1.8x to 2.0x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	0	0
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	0	0
Commercial Mortgage Loans \| 90% plus \| 1.5x to 1.8x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	27	28
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	27	28
Commercial Mortgage Loans \| 90% plus \| 1.2x to 1.5x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	0	15
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	0	15
Commercial Mortgage Loans \| 90% plus \| 1.0x to 1.2x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	0	0
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	0	0
Commercial Mortgage Loans \| 90% plus \| Less than 1.0x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	0	0
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	0	0
Commercial Mortgage Loans \| 30 to 59 Days
Financing Receivable, Recorded Investment, Aging [Abstract]
Financing receivables, recorded investment, past due	0	0
Commercial Mortgage Loans \| 60 to 89 Days
Financing Receivable, Recorded Investment, Aging [Abstract]
Financing receivables, recorded investment, past due	0	0
Commercial Mortgage Loans \| 90 Days or More
Financing Receivable, Recorded Investment, Aging [Abstract]
Financing receivables, recorded investment, past due	0	0
Agricultural Mortgages [Member] \| With No Related Allowance Recorded
Impaired Mortgage Loans [Abstract]
Impaired financing receivable, recorded investment	0	0
Impaired financing receivable, unpaid principal balance	0	0
Related allowance	0	0
Impaired financing receivable, average recorded investment	0	0
Impaired financing receivable, interest income recognized	0	0
Agricultural Mortgages [Member] \| With Related Allowance Recorded
Impaired Mortgage Loans [Abstract]
Impaired financing receivable, recorded investment	0	0
Impaired financing receivable, unpaid principal balance	0	0
Related allowance	0	0
Impaired financing receivable, average recorded investment	0	0
Impaired financing receivable, interest income recognized	0	0
Agricultural Mortgage Loans
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	2,529	2,501
Financing Receivable, Recorded Investment, Aging [Abstract]
Financing receivables, recorded investment, past due	45	17
Financing receivables, recorded investment, current	2,484	2,484
Total financing receivables	2,529	2,501
Financing receivable, recorded investment, 90 days or more past due and accruing	27	6
Agricultural Mortgage Loans \| Greater than 2.0x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	388	395
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	388	395
Agricultural Mortgage Loans \| 1.8x to 2.0x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	197	195
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	197	195
Agricultural Mortgage Loans \| 1.5x to 1.8x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	510	507
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	510	507
Agricultural Mortgage Loans \| 1.2x to 1.5x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	842	805
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	842	805
Agricultural Mortgage Loans \| 1.0x to 1.2x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	510	505
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	510	505
Agricultural Mortgage Loans \| Less than 1.0x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	82	94
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	82	94
Agricultural Mortgage Loans \| 0% - 50%
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	1,545	1,491
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	1,545	1,491
Agricultural Mortgage Loans \| 0% - 50% \| Greater than 2.0x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	270	254
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	270	254
Agricultural Mortgage Loans \| 0% - 50% \| 1.8x to 2.0x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	141	138
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	141	138
Agricultural Mortgage Loans \| 0% - 50% \| 1.5x to 1.8x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	297	296
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	297	296
Agricultural Mortgage Loans \| 0% - 50% \| 1.2x to 1.5x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	504	468
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	504	468
Agricultural Mortgage Loans \| 0% - 50% \| 1.0x to 1.2x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	300	286
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	300	286
Agricultural Mortgage Loans \| 0% - 50% \| Less than 1.0x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	33	49
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	33	49
Agricultural Mortgage Loans \| 50% - 70%
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	980	1,004
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	980	1,004
Agricultural Mortgage Loans \| 50% - 70% \| Greater than 2.0x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	118	141
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	118	141
Agricultural Mortgage Loans \| 50% - 70% \| 1.8x to 2.0x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	56	57
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	56	57
Agricultural Mortgage Loans \| 50% - 70% \| 1.5x to 1.8x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	213	209
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	213	209
Agricultural Mortgage Loans \| 50% - 70% \| 1.2x to 1.5x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	334	333
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	334	333
Agricultural Mortgage Loans \| 50% - 70% \| 1.0x to 1.2x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	210	219
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	210	219
Agricultural Mortgage Loans \| 50% - 70% \| Less than 1.0x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	49	45
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	49	45
Agricultural Mortgage Loans \| 70% - 90%
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	4	6
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	4	6
Agricultural Mortgage Loans \| 70% - 90% \| Greater than 2.0x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	0	0
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	0	0
Agricultural Mortgage Loans \| 70% - 90% \| 1.8x to 2.0x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	0	0
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	0	0
Agricultural Mortgage Loans \| 70% - 90% \| 1.5x to 1.8x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	0	2
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	0	2
Agricultural Mortgage Loans \| 70% - 90% \| 1.2x to 1.5x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	4	4
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	4	4
Agricultural Mortgage Loans \| 70% - 90% \| 1.0x to 1.2x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	0	0
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	0	0
Agricultural Mortgage Loans \| 70% - 90% \| Less than 1.0x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	0	0
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	0	0
Agricultural Mortgage Loans \| 90% plus
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	0	0
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	0	0
Agricultural Mortgage Loans \| 90% plus \| Greater than 2.0x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	0	0
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	0	0
Agricultural Mortgage Loans \| 90% plus \| 1.8x to 2.0x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	0	0
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	0	0
Agricultural Mortgage Loans \| 90% plus \| 1.5x to 1.8x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	0	0
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	0	0
Agricultural Mortgage Loans \| 90% plus \| 1.2x to 1.5x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	0	0
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	0	0
Agricultural Mortgage Loans \| 90% plus \| 1.0x to 1.2x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	0	0
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	0	0
Agricultural Mortgage Loans \| 90% plus \| Less than 1.0x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	0	0
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	0	0
Agricultural Mortgage Loans \| 30 to 59 Days
Financing Receivable, Recorded Investment, Aging [Abstract]
Financing receivables, recorded investment, past due	3	9
Agricultural Mortgage Loans \| 60 to 89 Days
Financing Receivable, Recorded Investment, Aging [Abstract]
Financing receivables, recorded investment, past due	15	2
Agricultural Mortgage Loans \| 90 Days or More
Financing Receivable, Recorded Investment, Aging [Abstract]
Financing receivables, recorded investment, past due	27	6
Total Mortgages Loan
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	10,613	9,765
Financing Receivable, Recorded Investment, Aging [Abstract]
Financing receivables, recorded investment, past due	45	17
Financing receivables, recorded investment, current	10,568	9,748
Total financing receivables	10,613	9,765
Financing receivable, recorded investment, 90 days or more past due and accruing	27	6
Total Mortgages Loan \| With No Related Allowance Recorded
Impaired Mortgage Loans [Abstract]
Impaired financing receivable, recorded investment	0	15
Impaired financing receivable, unpaid principal balance	0	15
Related allowance	0	0
Impaired financing receivable, average recorded investment	0	22
Impaired financing receivable, interest income recognized	0	0
Total Mortgages Loan \| With Related Allowance Recorded
Impaired Mortgage Loans [Abstract]
Impaired financing receivable, recorded investment	27	27
Impaired financing receivable, unpaid principal balance	27	27
Related allowance	(8)	(8)
Impaired financing receivable, average recorded investment	27	48
Impaired financing receivable, interest income recognized	1	2
Total Mortgages Loan \| Greater than 2.0x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	5,393	4,632
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	5,393	4,632
Total Mortgages Loan \| 1.8x to 2.0x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	752	785
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	752	785
Total Mortgages Loan \| 1.5x to 1.8x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	2,094	1,496
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	2,094	1,496
Total Mortgages Loan \| 1.2x to 1.5x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	1,586	2,103
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	1,586	2,103
Total Mortgages Loan \| 1.0x to 1.2x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	706	609
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	706	609
Total Mortgages Loan \| Less than 1.0x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	82	140
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	82	140
Total Mortgages Loan \| 0% - 50%
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	2,673	2,439
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	2,673	2,439
Total Mortgages Loan \| 0% - 50% \| Greater than 2.0x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	1,011	992
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	1,011	992
Total Mortgages Loan \| 0% - 50% \| 1.8x to 2.0x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	141	233
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	141	233
Total Mortgages Loan \| 0% - 50% \| 1.5x to 1.8x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	610	355
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	610	355
Total Mortgages Loan \| 0% - 50% \| 1.2x to 1.5x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	578	524
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	578	524
Total Mortgages Loan \| 0% - 50% \| 1.0x to 1.2x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	300	286
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	300	286
Total Mortgages Loan \| 0% - 50% \| Less than 1.0x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	33	49
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	33	49
Total Mortgages Loan \| 50% - 70%
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	7,239	6,500
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	7,239	6,500
Total Mortgages Loan \| 50% - 70% \| Greater than 2.0x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	4,212	3,358
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	4,212	3,358

INVESTMENTS (MORTGAGE LOANS) (Details) - USD ($)
$ in Millions

9 Months Ended

12 Months Ended

Sep. 30, 2017

Dec. 31, 2016

Commercial Mortgage Loans

Mortgage Loans on Real Estate [Line Items]

Mortgage loans on real estate

$ 8,084

$ 7,264

Financing Receivable, Recorded Investment, Aging [Abstract]

Financing receivables, recorded investment, past due