FAIR VALUE MEASUREMENTS (Details - Quantitative Information about Level 3 Fair Value Measurements, Liabilities) - Discounted cash flow - Level 3 - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Index Annuities
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair value	$ 1,517	$ 1,603
Index Annuities | Minimum
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Lapse rates	0.50%	0.50%
Mortality multiplier	42.00%	42.00%
Options Budget	1.00%	1.00%
Index Annuities | Maximum
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Lapse rates	40.00%	40.00%
Mortality multiplier	162.00%	162.00%
Options Budget	4.00%	4.00%
Index Life
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair value	$ 554	$ 515
Index Life | Minimum
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Base lapse rates	2.00%	2.00%
Mortality rates	0.00%	0.00%
Index Life | Maximum
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Base lapse rates	19.00%	19.00%
Mortality rates	40.00%	40.00%
GMWB and GMAB
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair value	$ 1,601	$ 1,994
GMWB and GMAB | Minimum
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Equity volatility	6.45%	6.45%
Base lapse rates	0.35%	0.35%
Dynamic lapse rates	30.00%	30.00%
Utilization rates	90.00%	90.00%
Mortality multiplier	40.00%	40.00%
Equity/Interest-rate Correlation	20.00%	20.00%
GMWB and GMAB | Maximum
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Equity volatility	50.55%	51.25%
Base lapse rates	14.00%	14.00%
Dynamic lapse rates	170.00%	170.00%
Utilization rates	100.00%	100.00%
Mortality multiplier	153.00%	153.00%
Equity/Interest-rate Correlation	40.00%	40.00%