INCOME TAXES (Details - Accounting For Uncertainty in Income Taxes) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Rollforward of the beginning and ending balances of the total amounts of gross unrecognized tax benefits
Gross unrecognized tax benefits, beginning of year	$ 4,762	$ 4,709	$ 4,707
Increases in tax positions for prior years	45	51	14
Decreases in tax positions for prior years	(131)	(1)	(6)
Increases in tax positions for current year	13	4	0
Settlements	(2,346)	(1)	(6)
Gross unrecognized tax benefits, end of year	$ 2,343	$ 4,762	$ 4,709