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Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2025
Retirement Benefits [Abstract]  
Schedule of Defined Benefit Plans Disclosures Contributions to our plans were as follows:
 Quarter Ended March 31,
(dollars in millions)20252024
Defined benefit plans$18 $12 
Defined contribution plans21 20 
Multi-employer pension and postretirement plans39 40 

The following table illustrates the components of net periodic benefit cost for the Company's defined benefit pension plans:

 Quarter Ended March 31,
(dollars in millions)20252024
Service cost$8 $8 
Interest cost8 8 
Expected return on plan assets(9)(8)
Recognized actuarial net loss1 — 
Total net periodic benefit cost$8 $8 
Schedule of Stock-based Compensation Expense and Resulting Tax Benefits
Stock-based compensation expense and the resulting tax benefits were as follows:

Quarter Ended March 31,
(dollars in millions)20252024
Stock-based compensation expense (Share Based)$21 $16 
Less: future tax benefit(2)(2)
Stock-based compensation expense, net of tax$19 $14