FAIR VALUE MEASUREMENTS (Details - Quantitative Information about Level 3 Fair Value Measurements, Assets) $ in Millions	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Obligations of states, municipalities and political subdivisions | Minimum | Measurement Input Yield [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.0391	0.0355
Obligations of states, municipalities and political subdivisions | Maximum | Measurement Input Yield [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.05	0.0432
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	0.0446	0.0394
Obligations of states, municipalities and political subdivisions | Discounted cash flow | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 1,473	$ 1,620
Corporate debt | Minimum | Measurement Input Yield [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.0435	0.0326
Corporate debt | Maximum | Measurement Input Yield [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.0599	0.1222
Corporate debt | Weighted-average | Measurement Input Yield [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.0517	0.0774
Corporate debt | Discounted cash flow | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 445	$ 1,086
Residential mortgage-backed securities | Minimum | Measurement Input Yield [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.0331	0.0273
Residential mortgage-backed securities | Minimum | Measurement Input Constant Prepayment Rate [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.0458	0.0397
Residential mortgage-backed securities | Minimum | Measurement Input Loss Severity [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.3966	0.4315
Residential mortgage-backed securities | Minimum | Measurement Input Constant Default Rate [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.0246	0.0331
Residential mortgage-backed securities | Maximum | Measurement Input Yield [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.055	0.0519
Residential mortgage-backed securities | Maximum | Measurement Input Constant Prepayment Rate [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.14	0.1342
Residential mortgage-backed securities | Maximum | Measurement Input Loss Severity [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.744	0.7715
Residential mortgage-backed securities | Maximum | Measurement Input Constant Default Rate [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.0739	0.083
Residential mortgage-backed securities | Weighted-average | Measurement Input Yield [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.044	0.0396
Residential mortgage-backed securities | Weighted-average | Measurement Input Constant Prepayment Rate [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.0929	0.0869
Residential mortgage-backed securities | Weighted-average | Measurement Input Loss Severity [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.5703	0.6015
Residential mortgage-backed securities | Weighted-average | Measurement Input Constant Default Rate [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.0492	0.058
Residential mortgage-backed securities | Discounted cash flow | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 13,608	$ 16,156
Certain CDO/ABS | Minimum | Measurement Input Yield [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.0365	0.0338
Certain CDO/ABS | Maximum | Measurement Input Yield [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.051	0.0478
Certain CDO/ABS | Weighted-average | Measurement Input Yield [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.0437	0.0408
Certain CDO/ABS | Discounted cash flow | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 5,461	$ 5,254
Commercial mortgage backed securities | Minimum | Measurement Input Yield [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.0329	0.0222
Commercial mortgage backed securities | Maximum | Measurement Input Yield [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.0607	0.0777
Commercial mortgage backed securities | Weighted-average | Measurement Input Yield [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Debt instrument, measurement input	0.0468	0.0499
Commercial mortgage backed securities | Discounted cash flow | Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 447	$ 487