FAIR VALUE MEASUREMENTS (Details - Gains or losses recorded related to the eligible instruments for which we elected the fair value option) - Fair Value Option - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value option gain (loss)	$ 1,061	$ 1,456	$ 555
Bonds
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value option gain (loss)	552	1,046	343
Alternative investments
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value option gain (loss)	685	591	213
Long-term debt
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value option gain (loss)	$ (176)	$ (181)	$ (1)