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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Disaggregation of revenue
Revenue from contracts with customers	$ 1,060	$ 995	$ 3,052	$ 2,992
Operating lease income	23	21	68	61
Total operating revenues	1,083	1,016	3,120	$ 3,053
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	758	767	2,283	$ 2,272
Transferred over time | Retail service
Disaggregation of revenue
Revenue from contracts with customers	696	697	2,098	2,064
Transferred over time | Retail service | Prior period reclassification
Disaggregation of revenue
Revenue from contracts with customers		(2)		(5)
Transferred over time | Retail service | 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	17	30	56	86
Transferred over time | Other service
Disaggregation of revenue
Revenue from contracts with customers	45	40	129	122
Transferred at point in time | Other service | Prior period reclassification
Disaggregation of revenue
Revenue from contracts with customers		2		5
Transferred at point in time | Equipment sales
Disaggregation of revenue
Revenue from contracts with customers	$ 302	$ 228	$ 769	$ 720

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