FAIR VALUE MEASUREMENTS (Details - Assets measured at fair value on a non-recurring basis at the time of impairment and the related impairment charges recorded during the periods presented) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Other investments
Fair Value Assets Measured on Nonrecurring Basis [Line Items]
Fair Value	$ 160		$ 160		$ 329
Other assets
Fair Value Assets Measured on Nonrecurring Basis [Line Items]
Fair Value	0		0		1
Fair value on a non-recurring basis | Fair Value Assets Impairment Charges Measured on Nonrecurring Basis [Domain]
Fair Value Assets Measured on Nonrecurring Basis [Line Items]
Fair Value	160		160		330
Impairment Charges	37	$ 26	60	$ 75
Fair value on a non-recurring basis | Other investments
Fair Value Assets Measured on Nonrecurring Basis [Line Items]
Impairment Charges	37	17	48	58
Fair value on a non-recurring basis | Other assets
Fair Value Assets Measured on Nonrecurring Basis [Line Items]
Impairment Charges	0	$ 9	12	$ 17
Fair value on a non-recurring basis | Level 1 | Fair Value Assets Impairment Charges Measured on Nonrecurring Basis [Domain]
Fair Value Assets Measured on Nonrecurring Basis [Line Items]
Fair Value	0		0		0
Fair value on a non-recurring basis | Level 1 | Other investments
Fair Value Assets Measured on Nonrecurring Basis [Line Items]
Fair Value	0		0		0
Fair value on a non-recurring basis | Level 1 | Other assets
Fair Value Assets Measured on Nonrecurring Basis [Line Items]
Fair Value	0		0		0
Fair value on a non-recurring basis | Level 2 | Fair Value Assets Impairment Charges Measured on Nonrecurring Basis [Domain]
Fair Value Assets Measured on Nonrecurring Basis [Line Items]
Fair Value	0		0		0
Fair value on a non-recurring basis | Level 2 | Other investments
Fair Value Assets Measured on Nonrecurring Basis [Line Items]
Fair Value	0		0		0
Fair value on a non-recurring basis | Level 2 | Other assets
Fair Value Assets Measured on Nonrecurring Basis [Line Items]
Fair Value	0		0		0
Fair value on a non-recurring basis | Level 3 | Fair Value Assets Impairment Charges Measured on Nonrecurring Basis [Domain]
Fair Value Assets Measured on Nonrecurring Basis [Line Items]
Fair Value	160		160		330
Fair value on a non-recurring basis | Level 3 | Other investments
Fair Value Assets Measured on Nonrecurring Basis [Line Items]
Fair Value	160		160		329
Fair value on a non-recurring basis | Level 3 | Other assets
Fair Value Assets Measured on Nonrecurring Basis [Line Items]
Fair Value	$ 0		$ 0		$ 1