PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Pension Plan [Member]
Defined Benefit Plan Disclosures [Line Items]
Service cost	$ 99	$ 102
Interest cost	171	143
Expected return on plan assets	424	422
Amortization of prior service credit	(6)	(5)
Defined Benefit Plan, Amortization of (Gain) Loss	167	224
Curtailment gain	0	(19)
Net periodic benefit cost	7	23
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosures [Line Items]
Service cost	1	2
Interest cost	7	6
Defined Benefit Plan, Amortization of (Gain) Loss	(4)	(2)
Net periodic benefit cost	$ 4	$ 6