REPOSITIONING AND OTHER CHARGES 4 (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($) Employees	Sep. 30, 2020 USD ($) Employees	Sep. 30, 2021 USD ($) Employees	Sep. 30, 2020 USD ($) Employees
Net Repositioning And Other Charges [Line Items]
Restructuring and Related Cost, Incurred Cost	$ 72	$ 124	$ 262	$ 449
Net repositioning and other charges Paragraph Details [Abstract]
Gross Repositioning Charge	$ 69	$ 135	$ 280	$ 491
Number of employees severed | Employees	603	3,113	5,252	13,042
Severance
Net Repositioning And Other Charges [Line Items]
Restructuring and Related Cost, Incurred Cost	$ 3	$ 113	$ 63	$ 433
Asset impairments
Net Repositioning And Other Charges [Line Items]
Restructuring and Related Cost, Incurred Cost	20	5	107	11
Exit costs
Net Repositioning And Other Charges [Line Items]
Restructuring and Related Cost, Cost Incurred to Date	30	32	30	32
Restructuring and Related Cost, Incurred Cost	46	17	110	47
Reserve adjustments
Net Repositioning And Other Charges [Line Items]
Restructuring and Related Cost, Incurred Cost	$ 3	$ (11)	$ (18)	$ (42)