INVESTMENTS (AVAILABLE FOR SALE SECURITIES) (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 32,274	$ 32,236
Gross Unrealized Gains	1,646	1,306
Gross Unrealized Losses	485	859
Fair Value	33,435	32,683
OTTI in AOCI	3	10
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Due in one year or less, Amortized Cost	1,701
Due in years two through five, Amortized Cost	7,349
Due in years six through ten, Amortized Cost	9,256
Due after ten years, Amortized Cost	12,817
Available for sale securities debt maturities single maturity date, Amortized Cost, Subtotal	31,123
Fixed maturities available for sale, amortized cost	32,139
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Due in one year or less, Fair Value	1,723
Due in years two through five, Fair Value	7,686
Due in years six through ten, Fair Value	9,530
Due after ten years, Fair Value	13,300
Available for sale securities debt maturities single maturity date, Fair Value, Subtotal	32,239
Available-for-sale securities, debt maturities, Fair Value, Total	33,300
Public corporate
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	12,429	12,418
Gross Unrealized Gains	748	675
Gross Unrealized Losses	39	81
Fair Value	13,138	13,012
OTTI in AOCI	0	0
Private corporate
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	7,069	6,880
Gross Unrealized Gains	256	215
Gross Unrealized Losses	34	55
Fair Value	7,291	7,040
OTTI in AOCI	0	0
U.S. Treasury, government and agency
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	10,842	10,739
Gross Unrealized Gains	473	221
Gross Unrealized Losses	379	624
Fair Value	10,936	10,336
OTTI in AOCI	0	0
State and Political Sub- divisions
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	414	432
Gross Unrealized Gains	67	63
Gross Unrealized Losses	0	2
Fair Value	481	493
OTTI in AOCI	0	0
Foreign Govts
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	369	375
Gross Unrealized Gains	29	29
Gross Unrealized Losses	5	14
Fair Value	393	390
OTTI in AOCI	0	0
Commercial Mortgage- backed
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	280	415
Gross Unrealized Gains	8	28
Gross Unrealized Losses	26	72
Fair Value	262	371
OTTI in AOCI	1	7
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Available-for-sale securities, debt maturities, without single maturity date, Amortized Cost	280
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Available-for-sale securities, debt maturities, without single maturity date, Fair Value	262
Residential Mortgage- backed
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	249	294
Gross Unrealized Gains	16	20
Gross Unrealized Losses	0	0
Fair Value	265	314
OTTI in AOCI	0	0
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Available-for-sale securities, debt maturities, without single maturity date, Amortized Cost	249
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Available-for-sale securities, debt maturities, without single maturity date, Fair Value	265
Asset- backed
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	30	51
Gross Unrealized Gains	1	10
Gross Unrealized Losses	1	1
Fair Value	30	60
OTTI in AOCI	2	3
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Available-for-sale securities, debt maturities, without single maturity date, Amortized Cost	30
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Available-for-sale securities, debt maturities, without single maturity date, Fair Value	30
Redeemable Preferred Stock
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	457	519
Gross Unrealized Gains	48	45
Gross Unrealized Losses	1	10
Fair Value	504	554
OTTI in AOCI	0	0
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Available-for-sale securities, debt maturities, without single maturity date, Amortized Cost	457
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Available-for-sale securities, debt maturities, without single maturity date, Fair Value	504
Fixed Maturities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	32,139	32,123
Gross Unrealized Gains	1,646	1,306
Gross Unrealized Losses	485	859
Fair Value	33,300	32,570
OTTI in AOCI	3	10
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Fixed maturities available for sale, amortized cost	32,139	32,123
Equity securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	135	113
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	135	113
OTTI in AOCI	$ 0	$ 0