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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, 2017
Dec. 31, 2016
Corporate debt    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value $ 536 $ 498
Corporate debt | Minimum    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Yield 3.16% 3.41%
Corporate debt | Maximum    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Yield 6.10% 6.38%
Corporate debt | Weighted-average    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Yield 4.63% 4.90%
Residential mortgage-backed securities    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value $ 16,780 $ 17,412
Residential mortgage-backed securities | Minimum    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Yield 3.17% 3.28%
Constant prepayment rate 1.81% 3.95%
Loss severity 48.00% 47.51%
Constant default rate 3.20% 3.28%
Residential mortgage-backed securities | Maximum    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Yield 5.73% 5.87%
Constant prepayment rate 9.65% 6.54%
Loss severity 80.38% 80.98%
Constant default rate 8.38% 8.64%
Residential mortgage-backed securities | Weighted-average    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Yield 4.45% 4.57%
Constant prepayment rate 5.73% 5.25%
Loss severity 64.19% 64.24%
Constant default rate 5.79% 5.96%
Certain CDO/ABS    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value $ 4,699 $ 4,368
Certain CDO/ABS | Minimum    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Yield 3.38% 3.67%
Certain CDO/ABS | Maximum    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Yield 5.68% 5.85%
Certain CDO/ABS | Weighted-average    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Yield 4.53% 4.76%
Commercial mortgage backed securities    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value $ 615 $ 1,511
Commercial mortgage backed securities | Minimum    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Yield 2.32% 0.48%
Commercial mortgage backed securities | Maximum    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Yield 8.45% 10.21%
Commercial mortgage backed securities | Weighted-average    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Yield 5.38% 5.34%
Obligations of states, municipalities and political subdivisions    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value $ 1,263 $ 1,248
Obligations of states, municipalities and political subdivisions | Minimum    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Yield 3.97% 4.12%
Obligations of states, municipalities and political subdivisions | Maximum    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Yield 5.06% 4.91%
Obligations of states, municipalities and political subdivisions | Weighted-average    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Yield 4.51% 4.52%