INVESTMENTS (DERIVATIVES) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Net investment income (loss) from derivatives	$ (125)	$ 16	$ (20)
Unrealized Gain (Loss) on Derivatives	1,601	(458)	(555)
Notional Amount	62,016	50,926
Asset Derivatives	14,228	13,597
Liability Derivatives	9,476	9,366
Gains (Losses) Reported In Income (Loss)	890	(1,211)
Fair value of freestanding derivative positions	$ 1,953	51
Swaps
Derivatives, Fair Value [Line Items]
Credit derivative term	5 years
Futures
Derivatives, Fair Value [Line Items]
Notional Amount	$ 3,113	5,086
Asset Derivatives	1	1
Liability Derivatives	3	1
Gains (Losses) Reported In Income (Loss)	(670)	(826)
Swaps
Derivatives, Fair Value [Line Items]
Notional Amount	4,655	3,529
Asset Derivatives	3	13
Liability Derivatives	126	67
Gains (Losses) Reported In Income (Loss)	(848)	(290)
Options
Derivatives, Fair Value [Line Items]
Notional Amount	20,630	11,465
Asset Derivatives	3,334	2,114
Liability Derivatives	1,426	1,154
Gains (Losses) Reported In Income (Loss)	1,203	727
Floors
Derivatives, Fair Value [Line Items]
Notional Amount	0	1,500
Asset Derivatives	0	11
Liability Derivatives	0	0
Gains (Losses) Reported In Income (Loss)	0	4
Swaps
Derivatives, Fair Value [Line Items]
Proceeds from Derivative Instrument, Financing Activities	3,905
Notional Amount	19,032	18,933
Asset Derivatives	320	246
Liability Derivatives	191	1,163
Gains (Losses) Reported In Income (Loss)	655	(224)
Fair value of freestanding derivative positions	(23)
Futures
Derivatives, Fair Value [Line Items]
Notional Amount	11,032	6,926
Asset Derivatives	0	0
Liability Derivatives	0	0
Gains (Losses) Reported In Income (Loss)	125	0
Swaptions
Derivatives, Fair Value [Line Items]
Notional Amount	0	0
Asset Derivatives	0	0
Liability Derivatives	0	0
Gains (Losses) Reported In Income (Loss)	0	87
Credit default swaps
Derivatives, Fair Value [Line Items]
Notional Amount	2,131	2,757
Asset Derivatives	35	20
Liability Derivatives	3	15
Gains (Losses) Reported In Income (Loss)	19	15
Foreign currency contracts
Derivatives, Fair Value [Line Items]
Notional Amount	1,423	730
Asset Derivatives	19	52
Liability Derivatives	10	6
Gains (Losses) Reported In Income (Loss)	(39)	45
Margin
Derivatives, Fair Value [Line Items]
Notional Amount	0	0
Asset Derivatives	24	113
Liability Derivatives	0	6
Gains (Losses) Reported In Income (Loss)	0	0
Collateral
Derivatives, Fair Value [Line Items]
Notional Amount	0	0
Asset Derivatives	4	713
Liability Derivatives	1,855	748
Gains (Losses) Reported In Income (Loss)	0	0
GMIB reinsurance contracts
Derivatives, Fair Value [Line Items]
Notional Amount	0	0
Asset Derivatives	10,488	10,314
Liability Derivatives	0	0
Gains (Losses) Reported In Income (Loss)	69	(261)
GMxB derivative features’ liability
Derivatives, Fair Value [Line Items]
Notional Amount	0	0
Asset Derivatives	0	0
Liability Derivatives	4,164	5,319
Gains (Losses) Reported In Income (Loss)	1,494	140
SCS, SIO, MSO and IUL indexed features’ liability
Derivatives, Fair Value [Line Items]
Notional Amount	0	0
Asset Derivatives	0	0
Liability Derivatives	1,698	887
Gains (Losses) Reported In Income (Loss)	(1,118)	(628)
U.S. Treasury, government and agency
Derivatives, Fair Value [Line Items]
Available-for-Sale Securities, Amount Derecognized in Period	3,905
Available-for-Sale Securities, Fair Value of Amount Derecognized	3,796
Treasury Inflation Protected Securities
Derivatives, Fair Value [Line Items]
Unrealized Gain (Loss) on Derivatives	86	(97)
Derivative investments
Derivatives, Fair Value [Line Items]
Net investment income (loss) from derivatives	$ (1,156)	$ (4)	$ 474

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The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments, including guarantees and other features treated as derivatives backing insurance products.

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Term of the credit risk derivative contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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