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Revenue Recognition - Disaggregation Of Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 4,039	$ 3,960	$ 3,948
Out-of-period adjustment
Disaggregation of Revenue [Line Items]
Immaterial error correction	During the third quarter of 2021, UScellular recorded a $9 million out-of-period error related to the timing of recognition of regulatory fee billings. This adjustment had the impact of increasing Service revenue by $9 million in 2021. UScellular determined that this adjustment was not material to any of the periods impacted.
Transferred over time
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 3,032	2,990	2,961
Transferred over time | Retail Service
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	2,765	2,686	2,650
Transferred over time | Retail Service | Out-of-period adjustment
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	9
Transferred over time | Inbound roaming
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	110	152	174
Transferred over time | Other service
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	157	152	137
Transferred at point in time | Equipment sales
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 1,007	$ 970	$ 987

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