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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of revenue
Revenue from contracts with customers	$ 995	$ 1,007	$ 2,992	$ 2,907
Operating lease income	21	20	61	57
Total operating revenues	1,016	1,027	$ 3,053	2,964
Out-of-period adjustment
Disaggregation of revenue
Immaterial error correction			During the three months ended September 30, 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 for the three and nine months ended September 30, 2021. UScellular determined that this adjustment was not material to any of the periods impacted.
Transferred over time
Disaggregation of revenue
Revenue from contracts with customers	767	755	$ 2,272	2,233
Transferred over time | Retail service1
Disaggregation of revenue
Revenue from contracts with customers	699	674	2,069	2,004
Transferred over time | Retail service1 | Out-of-period adjustment
Disaggregation of revenue
Revenue from contracts with customers	9		9
Transferred over time | Inbound roaming
Disaggregation of revenue
Revenue from contracts with customers	30	42	86	119
Transferred over time | Other service
Disaggregation of revenue
Revenue from contracts with customers	38	39	117	110
Transferred at point in time | Equipment sales
Disaggregation of revenue
Revenue from contracts with customers	$ 228	$ 252	$ 720	$ 674

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