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PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS
 3 Months Ended
Mar. 31, 2022
Retirement Benefits [Abstract]  
Pension and Other Postretirement Benefits Disclosure [Text Block] PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS
A summary of the Corporation's pension and other postretirement benefit plans can be found in Note 17 to the Consolidated Financial Statements included in the 2021 10-K. The following table provides the components of the Corporation's net periodic benefit cost (credit) for all significant plans:

Net Periodic Benefit Cost (Credit) for All Significant Plans Three Months Ended
In millionsMar 31, 2022Mar 31, 2021
Defined Benefit Pension Plans
Service cost $9 $8 
Interest cost 23 19 
Expected return on plan assets (57)(51)
Amortization of net loss 27 30 
Curtailment gain— (7)
Net periodic benefit cost (credit)$2 $(1)
Other Postretirement Benefit Plan
Interest cost $1 $1 
Amortization of net gain(2)(1)
Net periodic benefit cost (credit)$(1)$— 

Net periodic benefit cost (credit), other than the service cost component, is included in "Sundry income (expense) - net" in the consolidated statements of income.