v3.26.1
Accumulated Other Comprehensive Loss (Tables)
 3 Months Ended
Mar. 31, 2026
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Schedule of the Entity's Accumulated Other Comprehensive Loss by Component
The table below summarizes changes in accumulated other comprehensive loss recorded on our consolidated balance sheet by component:

Pension PlansPost-Retirement Benefit PlansForeign Currency Translation Adjustment and OtherTotal
 (Dollars in millions)
Balance as of December 31, 2025$(848)271 (24)(601)
Other comprehensive income (loss) before reclassifications— — 3 3 
Amounts reclassified from accumulated other comprehensive loss27 (10)— 17 
Net current-period other comprehensive income (loss)27 (10)3 20 
Balance as of March 31, 2026$(821)261 (21)(581)
The table below summarizes changes in accumulated other comprehensive loss recorded on our consolidated balance sheets by component:

Pension PlansPost-Retirement Benefit PlansForeign Currency Translation Adjustment and OtherTotal
 (Dollars in millions)
Balance as of December 31, 2024$(1,003)320 (40)(723)
Other comprehensive loss before reclassifications
— — 3 3 
Amounts reclassified from accumulated other comprehensive loss26 (6)— 20 
Net current-period other comprehensive income (loss)26 (6)3 23 
Balance as of March 31, 2025$(977)314 (37)(700)
Schedule of Reclassifications Out of Accumulated Other Comprehensive Loss by Component
The table below presents further information about our reclassifications out of accumulated other comprehensive loss by component:

Three Months Ended March 31, 2026Decrease (Increase)
in Net Income		Affected Line Item in Consolidated Statement of Operations
 (Dollars in millions) 
Amortization of pension & post-retirement plans(1)
  
Net actuarial loss$31 Other income, net
Prior service credit(8)Other income, net
Total before tax23  
Income tax benefit(6)Income tax expense (benefit)
Net of tax$17  
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(1)See Note 7—Employee Benefits for additional information on our net periodic benefit expense related to our pension and post-retirement plans.
The table below presents further information about our reclassifications out of accumulated other comprehensive loss by component:

Three Months Ended March 31, 2025Decrease (Increase)
in Net Income		Affected Line Item in Consolidated Statement of Operations
 (Dollars in millions) 
Amortization of pension & post-retirement plans(1)
  
Net actuarial loss$29 Other income, net
Prior service credit(2)Other income, net
Total before tax27  
Income tax benefit(7)Income tax expense (benefit)
Net of tax$20  
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(1)See Note 7—Employee Benefits for additional information on our net periodic benefit expense related to our pension and post-retirement plans.