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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, 2018
Dec. 31, 2017
Corporate debt    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value $ 721 $ 1,086
Corporate debt | Minimum    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Yield 3.52% 3.26%
Corporate debt | Maximum    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Yield 14.75% 12.22%
Corporate debt | Weighted-average    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Yield 9.14% 7.74%
Residential mortgage-backed securities    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value $ 14,915 $ 16,156
Residential mortgage-backed securities | Minimum    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Yield 3.14% 2.73%
Constant prepayment rate 4.29% 3.97%
Loss severity 39.93% 43.15%
Constant default rate 2.80% 3.31%
Residential mortgage-backed securities | Maximum    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Yield 5.42% 5.19%
Constant prepayment rate 12.86% 13.42%
Loss severity 75.33% 77.15%
Constant default rate 7.70% 8.30%
Residential mortgage-backed securities | Weighted-average    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Yield 4.28% 3.96%
Constant prepayment rate 8.57% 8.69%
Loss severity 57.63% 60.15%
Constant default rate 5.25% 5.80%
Certain CDO/ABS    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value $ 4,261 $ 5,254
Certain CDO/ABS | Minimum    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Yield 3.93% 3.38%
Certain CDO/ABS | Maximum    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Yield 5.25% 4.78%
Certain CDO/ABS | Weighted-average    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Yield 4.59% 4.08%
Commercial mortgage backed securities    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value $ 442 $ 487
Commercial mortgage backed securities | Minimum    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Yield 2.86% 2.22%
Commercial mortgage backed securities | Maximum    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Yield 6.36% 7.77%
Commercial mortgage backed securities | Weighted-average    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Yield 4.61% 4.99%
Obligations of states, municipalities and political subdivisions    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value $ 1,521 $ 1,620
Obligations of states, municipalities and political subdivisions | Minimum    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Yield 3.93% 3.55%
Obligations of states, municipalities and political subdivisions | Maximum    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Yield 4.54% 4.32%
Obligations of states, municipalities and political subdivisions | Weighted-average    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Yield 4.24% 3.94%