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Revenue Recognition (Tables)
9 Months Ended
Sep. 30, 2021
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenues
In the following table, TDS' revenues are disaggregated by type of service, which represents the relevant categorization of revenues for TDS' reportable segments, and timing of recognition. Service revenues are recognized over time and Equipment and product sales are point in time.
Three Months Ended September 30, 2021UScellularTDS TelecomCorporate, Eliminations and OtherTotal
(Dollars in millions)    
Revenues from contracts with customers:    
Type of service:    
Retail service1
$699 $— $— $699 
Inbound roaming30 — — 30 
Residential— 162 — 162 
Commercial— 45 — 45 
Wholesale— 43 — 43 
Other service38 — 19 57 
Service revenues from contracts with customers767 251 19 1,037 
Equipment and product sales228 — 35 263 
Total revenues from contracts with customers995 251 54 1,300 
Operating lease income21 28 
Total operating revenues$1,016 $252 $60 $1,328 

Three Months Ended September 30, 2020UScellularTDS TelecomCorporate, Eliminations and OtherTotal
(Dollars in millions)    
Revenues from contracts with customers:    
Type of service:    
Retail service$674 $— $— $674 
Inbound roaming42 — — 42 
Residential— 152 — 152 
Commercial— 48 — 48 
Wholesale— 45 — 45 
Other service39 — 18 57 
Service revenues from contracts with customers755 246 18 1,019 
Equipment and product sales252 — 26 278 
Total revenues from contracts with customers1,007 246 44 1,297 
Operating lease income20 27 
Total operating revenues$1,027 $247 $50 $1,324 
    
Nine Months Ended September 30, 2021UScellularTDS TelecomCorporate, Eliminations and OtherTotal
(Dollars in millions)    
Revenues from contracts with customers:    
Type of service:    
Retail service1
$2,069 $— $— $2,069 
Inbound roaming86 — — 86 
Residential— 479 — 479 
Commercial— 138 — 138 
Wholesale— 132 — 132 
Other service117 — 53 170 
Service revenues from contracts with customers2,272 749 53 3,074 
Equipment and product sales720 80 801 
Total revenues from contracts with customers2,992 750 133 3,875 
Operating lease income61 19 82 
Total operating revenues$3,053 $752 $152 $3,957 

 
Nine Months Ended September 30, 2020UScellularTDS TelecomCorporate, Eliminations and OtherTotal
(Dollars in millions)    
Revenues from contracts with customers:    
Type of service:    
Retail service$2,004 $— $— $2,004 
Inbound roaming119 — — 119 
Residential— 441 — 441 
Commercial— 146 — 146 
Wholesale— 137 — 137 
Other service110 — 51 161 
Service revenues from contracts with customers2,233 725 51 3,009 
Equipment and product sales674 86 761 
Total revenues from contracts with customers2,907 726 137 3,770 
Operating lease income57 20 79 
Total operating revenues$2,964 $728 $157 $3,849 

Numbers may not foot due to rounding.
1During 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.
Contract with Customer, Assets and Liabilities
The following table provides balances for contract assets from contracts with customers, which are recorded in Other current assets and Other assets and deferred charges in the Consolidated Balance Sheet, and contract liabilities from contracts with customers, which are recorded in Customer deposits and deferred revenues and Other deferred liabilities and credits in the Consolidated Balance Sheet.
 September 30, 2021December 31, 2020
(Dollars in millions) 
Contract assets$12 $13 
Contract liabilities$243 $216 
Remaining Performance Obligations
The following table includes estimated service revenues expected to be recognized related to performance obligations that are unsatisfied (or partially unsatisfied) at the end of the reporting period. These estimates represent service revenues to be recognized when services are delivered to customers pursuant to service plan contracts and under certain roaming agreements with other carriers. These estimates are based on contracts in place as of September 30, 2021 and may vary from actual results. As practical expedients, revenue related to contracts of less than one year, generally month-to-month contracts, and contracts with a fixed per-unit price and variable quantity, are excluded from these estimates.
 Service Revenues
(Dollars in millions) 
Remainder of 2021$204 
2022216 
Thereafter238 
Total
$658 
Contract Cost Assets
TDS expects that commission fees paid as a result of obtaining contracts are recoverable and therefore TDS defers and amortizes these costs. As a practical expedient, costs with an amortization period of one year or less are expensed as incurred. TDS also incurs fulfillment costs, such as installation costs, where there is an expectation that a future benefit will be realized. Deferred commission fees and fulfillment costs are amortized based on the timing of transfer of the goods or services to which the assets relate, typically the contract term. Contract cost asset balances, which are recorded in Other assets and deferred charges in the Consolidated Balance Sheet, were as follows:
 September 30, 2021December 31, 2020
(Dollars in millions) 
Costs to obtain contracts 
Sales commissions$135 $139 
Fulfillment costs
Installation costs10 10 
Total contract cost assets$145 $149