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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
 6 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Corporate debt    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value $ 454 $ 498
Corporate debt | Minimum    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Yield 3.90% 3.41%
Corporate debt | Maximum    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Yield 4.58% 6.38%
Corporate debt | Weighted-average    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Yield 4.24% 4.90%
Residential mortgage-backed securities    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value $ 16,471 $ 17,412
Residential mortgage-backed securities | Minimum    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Yield 2.96% 3.28%
Constant prepayment rate 2.26% 3.95%
Loss severity 47.43% 47.51%
Constant default rate 3.23% 3.28%
Residential mortgage-backed securities | Maximum    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Yield 5.32% 5.87%
Constant prepayment rate 10.48% 6.54%
Loss severity 79.54% 80.98%
Constant default rate 7.98% 8.64%
Residential mortgage-backed securities | Weighted-average    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Yield 4.14% 4.57%
Constant prepayment rate 6.37% 5.25%
Loss severity 63.49% 64.24%
Constant default rate 5.61% 5.96%
Certain CDO/ABS    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value $ 5,030 $ 4,368
Certain CDO/ABS | Minimum    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Yield 3.27% 3.67%
Certain CDO/ABS | Maximum    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Yield 5.33% 5.85%
Certain CDO/ABS | Weighted-average    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Yield 4.30% 4.76%
Commercial mortgage backed securities    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value $ 542 $ 1,511
Commercial mortgage backed securities | Minimum    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Yield 2.39% 0.48%
Commercial mortgage backed securities | Maximum    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Yield 8.01% 10.21%
Commercial mortgage backed securities | Weighted-average    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Yield 5.20% 5.34%
Obligations of states, municipalities and political subdivisions    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value $ 1,494 $ 1,248
Obligations of states, municipalities and political subdivisions | Minimum    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Yield 3.75% 4.12%
Obligations of states, municipalities and political subdivisions | Maximum    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Yield 4.68% 4.91%
Obligations of states, municipalities and political subdivisions | Weighted-average    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Yield 4.21% 4.52%