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PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS
9 Months Ended
Sep. 30, 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 EndedNine Months Ended
In millionsSep 30, 2022Sep 30, 2021Sep 30, 2022Sep 30, 2021
Defined Benefit Pension Plans  
Service cost $10 $$28 $20 
Interest cost 21 21 67 61 
Expected return on plan assets (57)(56)(170)(163)
Amortization of prior service credit— (1)(1)(1)
Amortization of net loss 28 29 82 87 
Curtailment gain— — — (7)
Net periodic benefit cost (credit)$$(1)$$(3)
Other Postretirement Benefit Plan
Service cost$$$$
Interest cost — 
Amortization of net gain(3)(1)(7)(3)
Net periodic benefit cost (credit)$(1)$— $(3)$— 

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