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Accounting Changes (Policies)
9 Months Ended
Sep. 30, 2021
Accounting Changes and Error Corrections [Abstract]  
Accounting Changes and Recent Accounting Pronouncements
ASU 2019-12

In December 2019, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2019-12, Simplifying the Accounting for Income Taxes (ASU 2019-12), which is intended to improve consistency and simplify several areas of existing guidance. ASU 2019-12 removes certain exceptions to the general principles related to the approach for intraperiod tax allocation, the methodology for calculating income taxes in an interim period and the recognition of deferred tax liabilities for outside basis differences. The new guidance also clarifies the accounting for transactions that result in a step-up in the tax basis of goodwill. We adopted ASU 2019-12 on January 1, 2021, and such adoption did not have a significant impact on our consolidated financial statements.
Revenue Recognition and Related Costs
Contract Balances

The timing of our recognition of revenue may differ from the timing of invoicing our customers. We record a trade receivable when we have transferred goods or services to a customer but have not yet received payment. Our trade receivables are reported net of an allowance for doubtful accounts. Such allowance aggregated $63.6 million and $48.3 million at September 30, 2021 and December 31, 2020, respectively.
If we transfer goods or services to a customer but do not have an unconditional right to payment, we record a contract asset. Contract assets typically arise from the uniform recognition of introductory promotional discounts over the contract period and accrued revenue for handset sales. Our contract assets were $31.4 million and $43.3 million as of September 30, 2021 and December 31, 2020, respectively. The current and long-term portions of our contract asset balances are included within other current assets and other assets, net, respectively, on our condensed consolidated balance sheets.
We record deferred revenue when we receive payment prior to transferring goods or services to a customer. We primarily defer revenue for (i) installation and other upfront services and (ii) other services that are invoiced prior to when services are provided. Our deferred revenue balances were $331.7 million and $437.3 million as of September 30, 2021 and December 31, 2020, respectively. The decrease in deferred revenue for the nine months ended September 30, 2021 is primarily due to the net effect of (a) the recognition of $292.8 million of revenue that was included in our deferred revenue balance at December 31, 2020 and (b) the impact of additions during the period. The long-term portions of our deferred revenue balances are included within other long-term liabilities on our condensed consolidated balance sheets.

Contract Costs

Our aggregate assets associated with incremental costs to obtain and fulfill our contracts were $54.1 million and $34.8 million at September 30, 2021 and December 31, 2020, respectively. The current and long-term portions of our assets related to contract costs are included within other current assets and other assets, net, respectively, on our condensed consolidated balance sheets. We amortized $4.9 million and $76.7 million during the three and nine months ended September 30, 2021, respectively, and $26.4 million and $80.3 million during the three and nine months ended September 30, 2020, respectively, to operating costs and expenses related to these assets.

Unsatisfied Performance Obligations

A large portion of our revenue is derived from customers who are not subject to contracts. Revenue from customers who are subject to contracts is generally recognized over the term of such contracts, which is typically 12 months for our residential service contracts, one to three years for our mobile service contracts and one to five years for our B2B service contracts.
Leases GeneralWe enter into operating and finance leases for network equipment, real estate, mobile site sharing and vehicles. We provide residual value guarantees on certain of our vehicle leases.