v3.26.1
Pension and Postretirement Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2026
Retirement Benefits [Abstract]  
Schedule of Net Periodic Benefit Cost (Benefit) Components of net periodic benefit cost and other supplemental information for the three months ended March 31, 2026 and 2025 follow:
Three months ended March 31,
Qualified and non-qualified pension benefitsPostretirement benefits
United StatesInternational
Net periodic benefit cost (benefit) (millions)202620252026202520262025
Operating expense
Service cost $24 $26 $11 $11 $4 $4 
Non-operating expense
Interest cost 100 108 50 46 16 19 
Expected return on plan assets (144)(142)(73)(65)(14)(14)
Amortization of prior service benefit— — — 1 (7)(1)
Amortization of net actuarial loss 64 69 2 2 4 5 
Total non-operating expense (benefit)20 35 (21)(16)(1)9 
Total net periodic benefit cost (benefit) $44 $61 $(10)$(5)$3 $13