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PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS
9 Months Ended
Sep. 30, 2023
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 16 to the Consolidated Financial Statements included in the 2022 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, 2023Sep 30, 2022Sep 30, 2023Sep 30, 2022
Defined Benefit Pension Plans  
Service cost $$10 $25 $28 
Interest cost 38 21 112 67 
Expected return on plan assets (52)(57)(156)(170)
Amortization of prior service credit— — — (1)
Amortization of net loss 16 28 48 82 
Net periodic benefit cost$10 $$29 $
Other Postretirement Benefit Plan
Service cost$— $$— $
Interest cost
Amortization of net gain(4)(3)(11)(7)
Net periodic benefit credit$(2)$(1)$(6)$(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.