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Debt (Tables)
6 Months Ended
Jun. 30, 2021
Debt Disclosure [Abstract]  
Revolving credit facilities
The following table summarizes the revolving credit agreements as of June 30, 2021:
TDSUScellular
(Dollars in millions)
Maximum borrowing capacity$400 $300 
Letters of credit outstanding$$— 
Amount borrowed$125 $— 
Amount available for use$274 $300 
The following table summarizes the term loan credit agreements as of June 30, 2021:
TDSUScellular
(Dollars in millions)
Maximum borrowing capacity$200 $300 
Amount borrowed$200 $300 
Amount available for use$— $—