FAIR VALUE MEASUREMENTS (Details - Quantitative Information about Level 3 Fair Value Measurements, Assets) $ in Millions	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Obligations of states, municipalities and political subdivisions | Minimum | Measurement Input Yield [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.0359	0.0391
Obligations of states, municipalities and political subdivisions | Maximum | Measurement Input Yield [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.0458	0.05
Obligations of states, municipalities and political subdivisions | Weighted-average | Measurement Input Yield [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.0408	0.0446
Obligations of states, municipalities and political subdivisions | Discounted cash flow | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 1,590	$ 1,473
Corporate debt | Minimum | Measurement Input Yield [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.0423	0.0435
Corporate debt | Maximum | Measurement Input Yield [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.0609	0.0599
Corporate debt | Weighted-average | Measurement Input Yield [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.0516	0.0517
Corporate debt | Discounted cash flow | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 530	$ 445
Residential mortgage-backed securities | Minimum | Measurement Input Yield [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.0296	0.0331
Residential mortgage-backed securities | Minimum | Measurement Input Constant Prepayment Rate [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.0363	0.0458
Residential mortgage-backed securities | Minimum | Measurement Input Loss Severity [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.3894	0.3966
Residential mortgage-backed securities | Minimum | Measurement Input Constant Default Rate [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.0217	0.0246
Residential mortgage-backed securities | Maximum | Measurement Input Yield [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.0507	0.055
Residential mortgage-backed securities | Maximum | Measurement Input Constant Prepayment Rate [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.1264	0.14
Residential mortgage-backed securities | Maximum | Measurement Input Loss Severity [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.7551	0.744
Residential mortgage-backed securities | Maximum | Measurement Input Constant Default Rate [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.0714	0.0739
Residential mortgage-backed securities | Weighted-average | Measurement Input Yield [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.0401	0.044
Residential mortgage-backed securities | Weighted-average | Measurement Input Constant Prepayment Rate [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.0813	0.0929
Residential mortgage-backed securities | Weighted-average | Measurement Input Loss Severity [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.5722	0.5703
Residential mortgage-backed securities | Weighted-average | Measurement Input Constant Default Rate [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.0465	0.0492
Residential mortgage-backed securities | Discounted cash flow | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 13,243	$ 13,608
Certain CDO/ABS | Minimum | Measurement Input Yield [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.0345	0.0365
Certain CDO/ABS | Maximum | Measurement Input Yield [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.0521	0.051
Certain CDO/ABS | Weighted-average | Measurement Input Yield [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.0433	0.0437
Certain CDO/ABS | Discounted cash flow | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 4,554	$ 5,461
Commercial mortgage backed securities | Minimum | Measurement Input Yield [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.0281	0.0329
Commercial mortgage backed securities | Maximum | Measurement Input Yield [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.0581	0.0607
Commercial mortgage backed securities | Weighted-average | Measurement Input Yield [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.0431	0.0468
Commercial mortgage backed securities | Discounted cash flow | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 484	$ 447