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PENSION AND OTHER POSTRETIREMENT BENEFIT PROGRAMS (Tables)
3 Months Ended
Mar. 31, 2026
Retirement Benefits [Abstract]  
Net Periodic Benefit Cost Relating to Pension and Other Postemployment Employee Benefit Plans
The following is a summary of net periodic benefit cost relating to our pension and OPEB plans.
Three Months Ended March 31,
(in millions)20262025
Pension benefits
Service cost$$
Interest cost31 34 
Expected return on plan assets(42)(44)
Amortization of net losses and prior service costs
Net periodic pension cost (benefit)$(5)$(6)
OPEB
Interest cost$$
Amortization of net loss and prior service credit— (4)
Net periodic OPEB cost (income)$$(2)