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Defined Severance Benefits
 9 Months Ended
Sep. 30, 2025
Retirement Benefits [Abstract]  
Defined Severance Benefits Defined Severance Benefits
Net periodic benefit costs consist of the following:
Three Months Ended September 30,Nine Months Ended September 30,
(in millions)
2025202420252024
Current service costs$56 $43 $158 $123 
Interest cost4 3 12 11 
Amortization of:
Prior service cost— 1 — 2 
Net actuarial loss2 1 7 2 
Net periodic benefit cost$62 $48 $177 $138