PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS (Tables)

9 Months Ended

Sep. 30, 2021

Retirement Benefits [Abstract]

Schedule of Net Benefit Costs [Table Text Block]

The following table provides the components of the Company's net periodic benefit cost for all significant plans:

Net Periodic Benefit Cost for All Significant Plans	Three Months Ended				Nine Months Ended
In millions	Sep 30, 2021		Sep 30, 2020		Sep 30, 2021		Sep 30, 2020
Defined Benefit Pension Plans
Service cost	$	95	$	100	$	293	$	298
Interest cost	151		191		444		574
Expected return on plan assets	(434)		(415)		(1,291)		(1,241)
Amortization of prior service credit	(5)		(4)		(15)		(14)
Amortization of net loss	198		194		622		578
Curtailment gain	—		—		(19)		—
Net periodic benefit cost	$	5	$	66	$	34	$	195
Other Postretirement Benefit Plans
Service cost	$	2	$	2	$	6	$	6
Interest cost	6		10		17		29
Amortization of net gain	(2)		(2)		(5)		(7)
Net periodic benefit cost	$	6	$	10	$	18	$	28