DERIVATIVES - Derivatives by Category (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Derivatives, Fair Value [Line Items]
Notional Amount	$ 99,602		$ 81,636
Fair Value, Assets Derivatives	6,470		4,936
Net Amount Presented in the Balance Sheets	12,383		9,226
Gains (Losses) Reported In Net Income (Loss)	(1,555)	$ (817)
Equity Futures
Derivatives, Fair Value [Line Items]
Notional Amount	6,544		10,411
Fair Value, Assets Derivatives	0		0
Net Amount Presented in the Balance Sheets	0		0
Gains (Losses) Reported In Net Income (Loss)	(738)	(29)
Equity Swaps
Derivatives, Fair Value [Line Items]
Notional Amount	8,065		7,697
Fair Value, Assets Derivatives	6		140
Net Amount Presented in the Balance Sheets	371		168
Gains (Losses) Reported In Net Income (Loss)	(973)	64
Equity Option
Derivatives, Fair Value [Line Items]
Notional Amount	37,417		21,698
Fair Value, Assets Derivatives	3,474		2,119
Net Amount Presented in the Balance Sheets	1,310		1,163
Gains (Losses) Reported In Net Income (Loss)	1,101	(15)
Interest Rate Swaps
Derivatives, Fair Value [Line Items]
Notional Amount	28,153		27,003
Fair Value, Assets Derivatives	910		632
Net Amount Presented in the Balance Sheets	209		194
Gains (Losses) Reported In Net Income (Loss)	648	(490)
Interest Rate Futures
Derivatives, Fair Value [Line Items]
Notional Amount	16,385		11,448
Fair Value, Assets Derivatives	0		0
Net Amount Presented in the Balance Sheets	0		0
Gains (Losses) Reported In Net Income (Loss)	55	40
Credit default swaps
Derivatives, Fair Value [Line Items]
Notional Amount	1,242		1,282
Fair Value, Assets Derivatives	22		17
Net Amount Presented in the Balance Sheets	0		0
Gains (Losses) Reported In Net Income (Loss)	10	0
Foreign Currency Contracts
Derivatives, Fair Value [Line Items]
Notional Amount	1,796		2,097
Fair Value, Assets Derivatives	24		27
Net Amount Presented in the Balance Sheets	1		14
Gains (Losses) Reported In Net Income (Loss)	10	(51)
Collateral
Derivatives, Fair Value [Line Items]
Notional Amount	0		0
Fair Value, Assets Derivatives	16		7
Net Amount Presented in the Balance Sheets	0		5
Gains (Losses) Reported In Net Income (Loss)	0	0
Margin
Derivatives, Fair Value [Line Items]
Notional Amount	0		0
Fair Value, Assets Derivatives	9		3
Net Amount Presented in the Balance Sheets	2,556		1,564
Gains (Losses) Reported In Net Income (Loss)	0	0
GMIB Reinsurance Contracts
Derivatives, Fair Value [Line Items]
Notional Amount	0		0
Fair Value, Assets Derivatives	2,009		1,991
Net Amount Presented in the Balance Sheets	0		0
Gains (Losses) Reported In Net Income (Loss)	27	(842)
GMxB Derivative Features’ Liability
Derivatives, Fair Value [Line Items]
Notional Amount	0		0
Fair Value, Assets Derivatives	0		0
Net Amount Presented in the Balance Sheets	5,944		5,431
Gains (Losses) Reported In Net Income (Loss)	(409)	485
SCS, SIO, MSO and IUL Indexed Features
Derivatives, Fair Value [Line Items]
Notional Amount	0		0
Fair Value, Assets Derivatives	0		0
Net Amount Presented in the Balance Sheets	1,992		$ 687
Gains (Losses) Reported In Net Income (Loss)	$ (1,286)	$ 21