STOCKHOLDERS' EQUITY Part 3 OCI (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended	12 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Other Comprehensive Income (Loss), before Tax [Abstract]
Change in cumulative translation adjustment, before tax	$ 9	$ (14)	$ 11	$ 5
Amortization of unrecognized prior service credits included in net periodic costs, before tax	(10)	(9)	(19)	(19)
Unrealized gain (loss), before tax	6	(5)	39	5
Reclassification adjustment for (gain) loss included in net income, before tax	12	17	19	14
Total other comprehensive income (loss), before tax	17	(11)	50	5
Other comprehensive income (loss), net of tax:
Change in cumulative translation adjustment	9	(14)	11	5	$ (29)
Amortization of unrecognized prior service credits	(7)	(7)	(14)	(14)
Unrealized gain (loss)	4	(3)	29	4
Reclassification adjustment for (gains) losses included in net income, net	9	12	14	10
Total other comprehensive income (loss), net of tax	$ 15	$ (12)	$ 40	$ 5	$ (59)

Amount, before tax, of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) of defined benefit plan.

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