INVESTMENTS (MORTGAGE LOANS) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2017	Dec. 31, 2016
Commercial Mortgage Loans
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	$ 7,686	$ 7,264
Financing Receivable, Recorded Investment, Aging [Abstract]
Financing receivables, recorded investment, past due	0	0
Financing receivables, recorded investment, current	7,686	7,264
Total financing receivables	7,686	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	15	15
Impaired financing receivable, unpaid principal balance	15	15
Related allowance	0	0
Impaired financing receivable, average recorded investment	15	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	0	2
Commercial Mortgage Loans \| Greater than 2.0x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	4,709	4,237
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	4,709	4,237
Commercial Mortgage Loans \| 1.8x to 2.0x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	606	590
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	606	590
Commercial Mortgage Loans \| 1.5x to 1.8x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	1,350	989
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	1,350	989
Commercial Mortgage Loans \| 1.2x to 1.5x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	871	1,298
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	871	1,298
Commercial Mortgage Loans \| 1.0x to 1.2x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	104	104
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	104	104
Commercial Mortgage Loans \| Less than 1.0x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	46	46
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	46	46
Commercial Mortgage Loans \| 0% - 50%
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	1,179	948
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	1,179	948
Commercial Mortgage Loans \| 0% - 50% \| Greater than 2.0x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	726	738
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	726	738
Commercial Mortgage Loans \| 0% - 50% \| 1.8x to 2.0x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	95	95
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	95	95
Commercial Mortgage Loans \| 0% - 50% \| 1.5x to 1.8x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	303	59
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	303	59
Commercial Mortgage Loans \| 0% - 50% \| 1.2x to 1.5x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	55	56
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	55	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	5,711	5,496
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	5,711	5,496
Commercial Mortgage Loans \| 50% - 70% \| Greater than 2.0x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	3,701	3,217
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	3,701	3,217
Commercial Mortgage Loans \| 50% - 70% \| 1.8x to 2.0x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	492	430
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	492	430
Commercial Mortgage Loans \| 50% - 70% \| 1.5x to 1.8x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	768	673
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	768	673
Commercial Mortgage Loans \| 50% - 70% \| 1.2x to 1.5x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	674	1,100
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	674	1,100
Commercial Mortgage Loans \| 50% - 70% \| 1.0x to 1.2x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	76	76
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	76	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	754	777
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	754	777
Commercial Mortgage Loans \| 70% - 90% \| Greater than 2.0x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	282	282
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	282	282
Commercial Mortgage Loans \| 70% - 90% \| 1.8x to 2.0x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	19	65
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	19	65
Commercial Mortgage Loans \| 70% - 90% \| 1.5x to 1.8x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	252	229
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	252	229
Commercial Mortgage Loans \| 70% - 90% \| 1.2x to 1.5x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	127	127
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	127	127
Commercial Mortgage Loans \| 70% - 90% \| 1.0x to 1.2x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	28	28
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	28	28
Commercial Mortgage Loans \| 70% - 90% \| Less than 1.0x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	46	46
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	46	46
Commercial Mortgage Loans \| 90% plus
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	42	43
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	42	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	15	15
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	15	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	2,503	2,501
Financing Receivable, Recorded Investment, Aging [Abstract]
Financing receivables, recorded investment, past due	29	17
Financing receivables, recorded investment, current	2,474	2,484
Total financing receivables	2,503	2,501
Financing receivable, recorded investment, 90 days or more past due and accruing	19	6
Agricultural Mortgage Loans \| Greater than 2.0x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	383	395
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	383	395
Agricultural Mortgage Loans \| 1.8x to 2.0x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	196	195
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	196	195
Agricultural Mortgage Loans \| 1.5x to 1.8x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	506	507
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	506	507
Agricultural Mortgage Loans \| 1.2x to 1.5x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	817	805
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	817	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	91	94
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	91	94
Agricultural Mortgage Loans \| 0% - 50%
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	1,501	1,491
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	1,501	1,491
Agricultural Mortgage Loans \| 0% - 50% \| Greater than 2.0x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	255	254
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	255	254
Agricultural Mortgage Loans \| 0% - 50% \| 1.8x to 2.0x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	140	138
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	140	138
Agricultural Mortgage Loans \| 0% - 50% \| 1.5x to 1.8x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	296	296
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	296	296
Agricultural Mortgage Loans \| 0% - 50% \| 1.2x to 1.5x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	468	468
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	468	468
Agricultural Mortgage Loans \| 0% - 50% \| 1.0x to 1.2x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	290	286
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	290	286
Agricultural Mortgage Loans \| 0% - 50% \| Less than 1.0x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	52	49
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	52	49
Agricultural Mortgage Loans \| 50% - 70%
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	996	1,004
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	996	1,004
Agricultural Mortgage Loans \| 50% - 70% \| Greater than 2.0x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	128	141
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	128	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	208	209
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	208	209
Agricultural Mortgage Loans \| 50% - 70% \| 1.2x to 1.5x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	345	333
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	345	333
Agricultural Mortgage Loans \| 50% - 70% \| 1.0x to 1.2x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	220	219
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	220	219
Agricultural Mortgage Loans \| 50% - 70% \| Less than 1.0x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	39	45
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	39	45
Agricultural Mortgage Loans \| 70% - 90%
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	6	6
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	6	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	2	2
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	2	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	2	9
Agricultural Mortgage Loans \| 60 to 89 Days
Financing Receivable, Recorded Investment, Aging [Abstract]
Financing receivables, recorded investment, past due	8	2
Agricultural Mortgage Loans \| 90 Days or More
Financing Receivable, Recorded Investment, Aging [Abstract]
Financing receivables, recorded investment, past due	19	6
Total Mortgages Loan
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	10,189	9,765
Financing Receivable, Recorded Investment, Aging [Abstract]
Financing receivables, recorded investment, past due	29	17
Financing receivables, recorded investment, current	10,160	9,748
Total financing receivables	10,189	9,765
Financing receivable, recorded investment, 90 days or more past due and accruing	19	6
Total Mortgages Loan \| With No Related Allowance Recorded
Impaired Mortgage Loans [Abstract]
Impaired financing receivable, recorded investment	15	15
Impaired financing receivable, unpaid principal balance	15	15
Related allowance	0	0
Impaired financing receivable, average recorded investment	15	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	0	2
Total Mortgages Loan \| Greater than 2.0x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	5,092	4,632
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	5,092	4,632
Total Mortgages Loan \| 1.8x to 2.0x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	802	785
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	802	785
Total Mortgages Loan \| 1.5x to 1.8x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	1,856	1,496
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	1,856	1,496
Total Mortgages Loan \| 1.2x to 1.5x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	1,688	2,103
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	1,688	2,103
Total Mortgages Loan \| 1.0x to 1.2x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	614	609
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	614	609
Total Mortgages Loan \| Less than 1.0x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	137	140
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	137	140
Total Mortgages Loan \| 0% - 50%
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	2,680	2,439
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	2,680	2,439
Total Mortgages Loan \| 0% - 50% \| Greater than 2.0x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	981	992
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	981	992
Total Mortgages Loan \| 0% - 50% \| 1.8x to 2.0x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	235	233
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	235	233
Total Mortgages Loan \| 0% - 50% \| 1.5x to 1.8x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	599	355
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	599	355
Total Mortgages Loan \| 0% - 50% \| 1.2x to 1.5x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	523	524
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	523	524
Total Mortgages Loan \| 0% - 50% \| 1.0x to 1.2x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	290	286
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	290	286
Total Mortgages Loan \| 0% - 50% \| Less than 1.0x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	52	49
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	52	49
Total Mortgages Loan \| 50% - 70%
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	6,707	6,500
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	6,707	6,500
Total Mortgages Loan \| 50% - 70% \| Greater than 2.0x
Mortgage Loans on Real Estate [Line Items]
Mortgage loans on real estate	3,829	3,358
Financing Receivable, Recorded Investment, Aging [Abstract]
Total financing receivables	3,829	3,358

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

3 Months Ended

12 Months Ended

Mar. 31, 2017

Dec. 31, 2016

Commercial Mortgage Loans

Mortgage Loans on Real Estate [Line Items]

Mortgage loans on real estate

$ 7,686

$ 7,264

Financing Receivable, Recorded Investment, Aging [Abstract]

Financing receivables, recorded investment, past due