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Debt (Tables)
 12 Months Ended
Dec. 31, 2020
Debt Disclosure [Abstract]  
Revolving credit facilities The following table summarizes the revolving credit agreements as of December 31, 2020:
 TDSUScellular
(Dollars in millions)  
Maximum borrowing capacity$400 $300 
Letters of credit outstanding$1 $2 
Amount borrowed$— $— 
Amount available for use$399 $298 
The following table summarizes the term loan credit agreements as of December 31, 2020:
 TDSUScellular
(Dollars in millions)  
Maximum borrowing capacity$200 $300 
Amount borrowed$125 $83 
Amount available for use$75 $217 
Long-term debt
Long-term debt as of December 31, 2020 and 2019, was as follows:
    December 31, 2020December 31, 2019
 
Issuance
date
Maturity
date
Call
date (any
time on
or after)
Principal
Amount
Less
Unamortized
discounts
and debt
issuance
costs
Total
Principal
Amount
Less
Unamortized
discount
and debt
issuance
costs
Total
(Dollars in millions)        
TDS Unsecured Senior Notes        
6.625%Mar 2005Mar 2045Mar 2010$116 $3 $113 $116 $3 $113 
6.875%Nov 2010Nov 2059Nov 2015225 7 218 225 7 218 
7.000%Mar 2011Mar 2060Mar 2016300 9 291 300 9 291 
5.875%Dec 2012Dec 2061Dec 2017195 7 188 195 7 188 
UScellular Unsecured Senior Notes
6.700%Dec 2003
and
June 2004		Dec 2033Dec 2003
and
June 2004		$544 $13 $531 $544 $13 $531 
6.950%May 2011May 2060May 2016342 11 331 342 11 331 
7.250%Dec 2014Dec 2063Dec 2019275 10 265 275 10 265 
7.250%Nov 2015Dec 2064Dec 2020300 10 290 300 10 290 
6.250%Aug 2020Sep 2069Sep 2025500 17 483 — — — 
5.500%Dec 2020Mar 2070Mar 2026500 17 483 — — — 
UScellular Term Loan83 3 80 83 1 82 
TDS Term Loan125 2 123 — — — 
EIP Securitization25 — 25 — — — 
Finance lease obligations7 — 7 8 — 8 
Installment payment agreement— — — 8 1 7 
Other long-term notes 1 — 1 2 — 2 
Total long-term debt $3,538 $109 $3,429 $2,398 $72 $2,326 
Long-term debt, current $5 $10 
Long-term debt, noncurrent $3,424 $2,316