v3.26.1
PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS (Tables)
 6 Months Ended
Jun. 30, 2026
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 EndedSix Months Ended
In millionsJun 30, 2026Jun 30, 2025Jun 30, 2026Jun 30, 2025
Defined Benefit Pension Plans  
Interest cost $27 $32 $55 $63 
Expected return on plan assets (35)(39)(70)(78)
Amortization of net loss 21 17 42 34 
Net periodic benefit cost$13 $10 $27 $19 
Other Postretirement Benefit Plan
Interest cost $1 $2 $2 $3 
Amortization of net gain(2)(3)(3)(6)
Net periodic benefit credit$(1)$(1)$(1)$(3)