EMPLOYEE BENEFITS (Details - Accumulated benefit obligations for U.S. and non-U.S. pension benefit plans) - Pensions - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
U.S.
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	$ 5,410	$ 4,972
Defined benefit pension plan obligations in which the projected benefit obligation was in excess of the related plan assets
Projected benefit obligation	5,410	4,972
Fair value of plan assets	4,931	4,465
Defined benefit pension plan obligations in which the accumulated benefit obligation was in excess of the related plan assets
Accumulated benefit obligation	5,410	4,972
Fair value of plan assets	4,931	4,465
Non U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	1,213	1,159
Defined benefit pension plan obligations in which the projected benefit obligation was in excess of the related plan assets
Projected benefit obligation	1,019	1,005
Fair value of plan assets	620	605
Defined benefit pension plan obligations in which the accumulated benefit obligation was in excess of the related plan assets
Accumulated benefit obligation	931	931
Fair value of plan assets	$ 620	$ 605