FAIR VALUE MEASUREMENTS (Details - Quantitative Information about Level 3 Fair Value Measurements, Assets) $ in Millions	Sep. 30, 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	0.0312	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	0.0374	0.0500
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	0.0343	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	0.0295	0.0435
Corporate debt | Maximum | Measurement Input Yield [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.0703	0.0599
Corporate debt | Weighted-average | Measurement Input Yield [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.0499	0.0517
Corporate debt | Discounted cash flow | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 781	$ 445
Residential mortgage-backed securities | Minimum | Measurement Input Yield [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.0229	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	0.0387	0.0458
Residential mortgage-backed securities | Minimum | Measurement Input Loss Severity [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.3665	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	0.0181	0.0246
Residential mortgage-backed securities | Maximum | Measurement Input Yield [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.0447	0.0550
Residential mortgage-backed securities | Maximum | Measurement Input Constant Prepayment Rate [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.1223	0.1400
Residential mortgage-backed securities | Maximum | Measurement Input Loss Severity [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.7825	0.7440
Residential mortgage-backed securities | Maximum | Measurement Input Constant Default Rate [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.0641	0.0739
Residential mortgage-backed securities | Weighted-average | Measurement Input Yield [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.0338	0.0440
Residential mortgage-backed securities | Weighted-average | Measurement Input Constant Prepayment Rate [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.0805	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	0.5745	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	0.0411	0.0492
Residential mortgage-backed securities | Discounted cash flow | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 12,350	$ 13,608
Certain CDO/ABS | Minimum | Measurement Input Yield [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.0273	0.0365
Certain CDO/ABS | Maximum | Measurement Input Yield [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.0475	0.0510
Certain CDO/ABS | Weighted-average | Measurement Input Yield [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.0374	0.0437
Certain CDO/ABS | Discounted cash flow | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 5,903	$ 5,461
Commercial mortgage backed securities | Minimum | Measurement Input Yield [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.0248	0.0329
Commercial mortgage backed securities | Maximum | Measurement Input Yield [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.0482	0.0607
Commercial mortgage backed securities | Weighted-average | Measurement Input Yield [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.0365	0.0468
Commercial mortgage backed securities | Discounted cash flow | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 499	$ 447