STOCKHOLDERS' EQUITY Part 2 AOCI (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Cumulative Translation Adjustment	$ (291)		$ (293)	$ (264)
Change in cumulative translation adjustment	2	$ 19	(29)
Benefit Plans Unrecognized Prior Service Credits	80		87	106
Change in Benefit Plans Unrecognized Prior Service Credits	(7)		(19)
Unrealized Gains (Losses) on Derivative Instruments	(36)		(66)	(55)
Change in Unrealized Gains (Losses) on Derivative Instruments	30		(11)
Unrealized Losses on Investments	(1)		(1)	(1)
Change in Unrealized Losses on Investments	0		0
Accumulated Other Comprehensive Income (Loss), Net of Tax	(248)		(273)	$ (214)
Total other comprehensive income (loss), net of tax	$ 25	$ 17	$ (59)