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Pension and Postretirement Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2025
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, 2025 and 2024 follow:
Three months ended March 31,
Qualified and non-qualified pension benefits
Postretirement benefits
United StatesInternational
(Millions)202520242025202420252024
Net periodic benefit cost (benefit)
Operating expense
Service cost $26 $37 $11 $21 $4 $7 
Non-operating expense
Interest cost 108 160 46 54 19 22 
Expected return on plan assets (142)(237)(65)(87)(14)(19)
Amortization of transition asset— — — 1 — — 
Amortization of prior service benefit— (4)1 1 (1)(6)
Amortization of net actuarial loss 69 95 2 3 5 6 
Total non-operating expense (benefit)35 14 (16)(28)9 3 
Total net periodic benefit cost (benefit) $61 $51 $(5)$(7)$13 $10 
Service cost - continuing operations26 30 11 16 4 6 
Service cost - discontinued operations— 7 — 5 — 1 
Total service cost$26 $37 $11 $21 $4 $7 
Non-operating expense (benefit) - continuing operations35 14 (16)(28)9 3 
Non-operating expense (benefit) - discontinued operations— — — — — — 
Total non-operating expense (benefit)$35 $14 $(16)$(28)$9 $3 
Total net periodic benefit cost (benefit) - continuing operations61 44 (5)(12)13 9 
Total net periodic benefit cost (benefit) - discontinued operations— 7 — 5 — 1 
Total net periodic benefit cost (benefit)$61 $51 $(5)$(7)$13 $10