Accumulated Other Comprehensive Loss (Tables)

6 Months Ended

Jun. 30, 2025

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 for the six months ended June 30, 2025:

	Pension Plans		Post-Retirement Benefit Plans	Foreign Currency Translation Adjustment and Other	Total
	(Dollars in millions)
Balance at December 31, 2024	$	(1,003)	320	(40)	(723)
Other comprehensive income (loss) before reclassifications	—		—	3	3
Amounts reclassified from accumulated other comprehensive loss	54		(13)	—	41
Net current-period other comprehensive income (loss)	54		(13)	3	44
Balance at June 30, 2025	$	(949)	307	(37)	(679)

The table below summarizes changes in accumulated other comprehensive loss recorded on our consolidated balance sheets by component for the six months ended June 30, 2024:

	Pension Plans		Post-Retirement Benefit Plans	Foreign Currency Translation Adjustment and Other	Total
	(Dollars in millions)
Balance at December 31, 2023	$	(1,045)	276	(41)	(810)
Other comprehensive loss before reclassifications	—		—	(5)	(5)
Amounts reclassified from accumulated other comprehensive loss	38		(9)	—	29
Net current-period other comprehensive income (loss)	38		(9)	(5)	24
Balance at June 30, 2024	$	(1,007)	267	(46)	(786)

Schedule of Reclassifications Out of Accumulated Other Comprehensive Loss by Component

The tables below present further information about our reclassifications out of accumulated other comprehensive loss by component for the three and six months ended June 30, 2025:

Three Months Ended June 30, 2025	Decrease (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	$	30	Other income, net
Prior service credit	(2)		Other income, net
Total before tax	28
Income tax benefit	(7)		Income tax (benefit) expense
Net of tax	$	21

Six Months Ended June 30, 2025	Decrease (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	$	59	Other income, net
Prior service credit	(4)		Other income, net
Total before tax	55
Income tax benefit	(14)		Income tax (benefit) expense
Net of tax	$	41

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(1)See Note 8—Employee Benefits for additional information on our net periodic benefit expense related to our pension and post-retirement plans.

The tables below present further information about our reclassifications out of accumulated other comprehensive loss by component for the three and six months ended June 30, 2024:

Three Months Ended June 30, 2024	Decrease (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	$	21	Other income, net
Prior service credit	(3)		Other income, net
Total before tax	18
Income tax benefit	(4)		Income tax (benefit) expense
Net of tax	$	14

Six Months Ended June 30, 2024	Decrease (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	$	45	Other income, net
Prior service credit	(7)		Other income, net
Total before tax	38
Income tax benefit	(9)		Income tax (benefit) expense
Net of tax	$	29

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(1)See Note 8—Employee Benefits for additional information on our net periodic benefit expense related to our pension and post-retirement plans.