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Employee Benefits (Tables)
 6 Months Ended
Jun. 30, 2025
Retirement Benefits [Abstract]  
Benefit or (Income) Cost Related to Pension and Postretirement Health Care and Life Insurance
The following tables summarize the components of net periodic benefit cost related to our pension and postretirement health care and life insurance plans:
(dollars in millions)
PensionHealth Care and Life
Three Months Ended June 30,2025202420252024
Service cost - Cost of services$35 $39 $7 $11 
Service cost - Selling, general and administrative expense6 6 1 2 
Service cost$41 $45 $8 $13 
Amortization of prior service cost (credit)$28 $28 $(32)$(32)
Expected return on plan assets(134)(140)(7)(7)
Interest cost101 112 137 136 
Remeasurement loss, net45 136 — — 
Other components$40 $136 $98 $97 
Total$81 $181 $106 $110 
(dollars in millions)
PensionHealth Care and Life
Six Months Ended June 30,
2025202420252024
Service cost - Cost of services$69 $80 $14 $22 
Service cost - Selling, general and administrative expense
11 13 3 4 
Service cost$80 $93 $17 $26 
Amortization of prior service cost (credit)$56 $56 $(64)$(64)
Expected return on plan assets(268)(348)(14)(14)
Interest cost204 269 273 271 
Remeasurement loss, net45 63 — — 
Other components$37 $40 $195 $193 
Total$117 $133 $212 $219