v3.25.3
PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS (Tables)
 9 Months Ended
Sep. 30, 2025
Retirement Benefits [Abstract]  
Net Periodic Benefit Cost for All Significant Plans 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, 2025Sep 30, 2024Sep 30, 2025Sep 30, 2024
Defined Benefit Pension Plans  
Interest cost $31 $32 $94 $97 
Expected return on plan assets (41)(42)(119)(127)
Amortization of net loss 19 17 53 50 
Net periodic benefit cost$9 $7 $28 $20 
Other Postretirement Benefit Plan
Interest cost $2 $2 $5 $5 
Amortization of net gain(4)(3)(10)(9)
Net periodic benefit credit$(2)$(1)$(5)$(4)