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Defined Severance Benefits
 6 Months Ended
Jun. 30, 2025
Retirement Benefits [Abstract]  
Defined Severance Benefits Defined Severance Benefits
Net periodic benefit costs consist of the following:
Three Months Ended June 30,Six Months Ended June 30,
(in millions)
2025202420252024
Current service costs$52 $39 $102 $79 
Interest cost4 4 8 8 
Amortization of:
Prior service cost— 1 — 1 
Net actuarial loss3 1 5 2 
Net periodic benefit cost$59 $45 $115 $90