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Debt (Table)
 12 Months Ended
Dec. 31, 2021
Debt Disclosure [Abstract]  
Revolving credit facilities
The following table summarizes the revolving credit agreement as of December 31, 2021:
(Dollars in millions) 
Maximum borrowing capacity$300 
Letters of credit outstanding$— 
Amount borrowed$— 
Amount available for use$300 
The following table summarizes the term loan credit agreements as of December 31, 2021:
(Dollars in millions) 
Maximum borrowing capacity$800 
Amount borrowed and outstanding$299 
Amount borrowed and repaid$1 
Amount available for use$500 
Long-term debt
Long-term debt as of December 31, 2021 and 2020, was as follows:
    December 31, 2021December 31, 2020
Issuance
date
Redemption 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       
6.700%Dec 2003
and
June 2004		Dec 2033Dec 2003
and
June 2004		$544 $12 $532 $544 $13 $531 
6.950%May 2011Sep 2021May 2060May 2016— — — 342 11 331 
7.250%Dec 2014May 2021Dec 2063Dec 2019— — — 275 10 265 
7.250%Nov 2015Jun 2021Dec 2064Dec 2020— — — 300 10 290 
6.250%Aug 2020Sep 2069Sep 2025500 17 483 500 17 483 
5.500%Dec 2020Mar 2070Mar 2026500 17 483 500 17 483 
5.500%May 2021Jun 2070Jun 2026500 16 484 — — — 
Term Loan299 3 296 83 3 80 
EIP Securitization450 — 450 25 — 25 
Finance lease obligations 3 — 3 3 — 3 
Total long-term debt $2,796 $65 $2,731 $2,572 $81 $2,491 
Long-term debt, current $3 $2 
Long-term debt, noncurrent $2,728 $2,489