Debt - Revolving Credit Agreements (Details) $ in Millions	3 Months Ended
	Mar. 31, 2022 USD ($)
TDS Revolving credit facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 400
Letters of credit outstanding	1
Amount borrowed	0
Amount available for use	$ 399
TDS Revolving credit facility | LIBOR rate
Line of Credit Facility [Line Items]
Contractual spread	1.50%
UScellular Revolving credit facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 300
Letters of credit outstanding	0
Amount borrowed	0
Amount available for use	300
Amount borrowed during the period	75
Amount repaid during the period	$ 75
UScellular Revolving credit facility | SOFR rate
Line of Credit Facility [Line Items]
Contractual spread	1.60%