FAIR VALUE MEASUREMENTS (Details - Quantitative Information about Level 3 Fair Value Measurements, Assets)) - Discounted cash flow - Level 3 - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Corporate debt
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 884	$ 642
Corporate debt | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	3.50%	5.63%
Corporate debt | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	9.37%	12.45%
Corporate debt | Weighted-average
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	6.43%	9.04%
Residential mortgage-backed securities
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 13,110	$ 17,280
Residential mortgage-backed securities | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	3.45%	3.13%
Constant prepayment rate	1.29%	0.99%
Loss severity	51.03%	47.21%
Constant default rate	3.91%	3.49%
Residential mortgage-backed securities | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	6.09%	6.14%
Constant prepayment rate	8.81%	8.95%
Loss severity	79.95%	79.50%
Constant default rate	8.89%	9.04%
Residential mortgage-backed securities | Weighted-average
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	4.77%	4.63%
Constant prepayment rate	5.05%	4.97%
Loss severity	65.49%	63.35%
Constant default rate	6.40%	6.26%
Certain CDO/ABS
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 6,845	$ 3,338
Certain CDO/ABS | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	4.05%	3.41%
Certain CDO/ABS | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	6.81%	4.98%
Certain CDO/ABS | Weighted-average
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	5.43%	4.19%
Commercial mortgage backed securities
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 2,187	$ 2,388
Commercial mortgage backed securities | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	1.08%	0.00%
Commercial mortgage backed securities | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	13.15%	17.65%
Commercial mortgage backed securities | Weighted-average
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	7.12%	6.62%
Obligations of states, municipalities and political subdivisions
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 1,330	$ 1,217
Obligations of states, municipalities and political subdivisions | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	3.87%	4.32%
Obligations of states, municipalities and political subdivisions | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	4.74%	5.10%
Obligations of states, municipalities and political subdivisions | Weighted-average
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Yield	4.31%	4.71%