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Debt (Table)
 12 Months Ended
Dec. 31, 2024
Debt Disclosure [Abstract]  
Credit facilities
The following table summarizes the unsecured revolving credit agreement as of December 31, 2024:
(Dollars in millions) 
Maximum borrowing capacity$300 
Letters of credit outstanding$— 
Amount borrowed and outstanding$— 
Amount available for use$300 
The following table summarizes the unsecured term loan credit agreements as of December 31, 2024:
Term Loan 11
Term Loan 2Term Loan 3Total
(Dollars in millions)
Maximum borrowing capacity$300 $300 $200 $800 
Amount borrowed and outstanding$237 $290 $196 $723 
Amount borrowed and repaid$63 $10 $4 $77 
Amount available for use$— $— $— $— 
Interest rate
SOFR plus 1.60%
SOFR plus 2.10%
SOFR plus 2.60%
Maturity dateJuly 2026July 2028July 2031
Quarterly installments
$4 million from March 2024 to December 2025; $8 million from March 2026 to maturity date
$0.75 million from December 2021 to maturity date
$0.5 million from December 2022 to September 2026; $1 million from December 2026 to maturity date
Long-term debt
Long-term debt as of December 31, 2024 and 2023, was as follows:
    December 31, 2024December 31, 2023
Issuance
date
Maturity
date
Call
date (any
time on
or after)
Principal
Amount
Less
Unamortized
discount
and debt
issuance
costs		Total
Principal
Amount
Less
Unamortized
discount
and debt
issuance
costs
Total
(Dollars in millions)       
Unsecured Senior Notes       
6.70%Dec 2003
and
June 2004		Dec 2033Dec 2003
and
June 2004		$544 $10 $534 $544 $11 $533 
6.25%Aug 2020Sep 2069Sep 2025500 17 483 500 17 483 
5.50%Dec 2020Mar 2070Mar 2026500 17 483 500 17 483 
5.50%May 2021Jun 2070Jun 2026500 16 484 500 16 484 
Term Loans723 4 719 783 4 779 
EIP Securitization2 — 2 150 — 150 
Export Credit Financing150 — 150 150 1 149 
Finance lease obligations 4 — 4 3 — 3 
Total long-term debt $2,923 $64 $2,859 $3,130 $66 $3,064 
Long-term debt, current $22 $20 
Long-term debt, noncurrent $2,837 $3,044