Basis of Presentation and Summary of Significant Accounting Policies	12 Months Ended
Dec. 31, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation and Summary of Significant Accounting Policies	Basis of Presentation and Summary of Significant Accounting Policies Basis of Presentation We are an integrated communications company engaged primarily in providing an array of communications services to our residential, business, governmental and wholesale customers. Our communications services include local, broadband, private line (including special access), network access, Ethernet, wireless and video services. In certain local and regional markets, we also provide local access and fiber transport services to competitive local exchange carriers. We generate the majority of our revenues from services provided in the 14-state region of Arizona, Colorado, Idaho, Iowa, Minnesota, Montana, Nebraska, New Mexico, North Dakota, Oregon, South Dakota, Utah, Washington, and Wyoming. We refer to this region as our local service area. On April 1, 2011, our indirect parent QCII became a wholly owned subsidiary of CenturyLink, Inc. in a tax-free, stock-for-stock transaction. Although we have continued as a surviving corporation and legal entity since the acquisition, the accompanying consolidated statements of operations, comprehensive income, cash flows and stockholder's equity (deficit) are presented for two periods: predecessor and successor, which relate to the period preceding the acquisition and the period succeeding the acquisition, respectively. On the date of the acquisition, April 1, 2011, our assets and liabilities were recognized at their fair value. This revaluation has been reflected in our consolidated financial statements and, therefore, has resulted in a new basis of accounting for the "successor period". This new basis of accounting means that our consolidated financial statements for the successor periods are not comparable to our consolidated financial statements relating to periods prior to the acquisition, including the predecessor period consolidated financial statements in this annual report. The accompanying consolidated financial statements include our accounts and the accounts of our subsidiaries over which we exercise control. All intercompany amounts and transactions with our consolidated subsidiaries have been eliminated. Effective January 1, 2012, in connection with post-acquisition systems integration activities, we adopted the affiliate expense allocation methodology used by our ultimate parent. This methodology results in certain overhead costs incurred by us and by our direct parent that were previously assessed to us on a net basis now being assessed on a gross basis both to and from our ultimate parent, resulting in both higher affiliate revenues and expenses for us. This change resulting from systems integration activities did not have a significant impact to our consolidated net income for the successor years ended December 31, 2013 and 2012. During the year ended December 31, 2013, we recorded a correction of an error related to an understatement of our current deferred tax asset, an understatement of our deferred tax liabilities and an overstatement of goodwill recorded in connection with the purchase accounting of us in 2011. Therefore, we recognized a $17 million increase to current deferred income tax asset, a $2 million increase to noncurrent deferred income tax liability and a $15 million reduction to goodwill on our consolidated balance sheet as of December 31, 2012. The correction of the error did not have an effect on our consolidated statements of operations or on our consolidated statements of cash flows for the years ended December 31, 2012 and 2011. During the first quarter of 2012, in connection with post-acquisition systems integration activities, CenturyLink changed certain cash management processes applicable to us. Therefore, we now present the balances related to these cash management transactions on a net basis with our other affiliate transactions. During the first quarter of 2012, we recognized a $100 million equity contribution for the tax benefit associated with a deduction for pension funding. Since we are the employer of a significant percentage of the participants and none of the 2011 QCII pension funding was allocated to us, a tax deduction was recognized on our separate company tax return and, therefore, we recognized an equity contribution for the tax benefits associated with this deduction. Effective January 1, 2012, we changed our rates of capitalized labor as we transitioned certain legacy systems to the historical systems of our ultimate parent, CenturyLink. This transition resulted in an estimated $40 million to $55 million increase in the amount of labor capitalized as an asset compared to the amount that would have been capitalized if we had continued to use our legacy systems and a corresponding estimated $40 million to $55 million decrease in operating expenses for the successor year ended December 31, 2012. The reduction in expenses described above, net of tax, increased net income approximately $25 million to $34 million for the successor year ended December 31, 2012. Effective January 1, 2012, we changed our estimates of the remaining useful lives and net salvage value for certain telecommunications equipment. These changes resulted in a decrease to depreciation expense of approximately $52 million for the successor year ended December 31, 2012. This decrease in depreciation expense, net of tax, had the effect of increasing net income by approximately $32 million for the successor year ended December 31, 2012. Effective January 2014, we will change the estimates of the remaining economic lives of certain switch and circuit network equipment. We estimate this will result in a net increase in depreciation expense in our consolidated statements of operations of $19 million for the year ended December 31, 2014. We also reclassified certain other prior period amounts to conform to the current period presentation. These changes had no impact on total operating expenses or net income for any period. Summary of Significant Accounting Policies Use of Estimates Our consolidated financial statements are prepared in accordance with U.S. generally accepted accounting principles. These accounting principles require us to make certain estimates, judgments and assumptions. We believe that the estimates, judgments and assumptions we make when accounting for items and matters such as, but not limited to, long-term contracts, customer retention patterns, allowance for doubtful accounts, depreciation, amortization, asset valuations, internal labor capitalization rates, recoverability of assets (including deferred tax assets), impairment assessments, pension, post-retirement and other post-employment benefits, taxes, certain liabilities and other provisions and contingencies are reasonable, based on information available at the time they were made. Our accounting for CenturyLink's indirect acquisition of us required extensive use of estimates in determining the acquisition date fair values of our assets and liabilities. These estimates, judgments and assumptions can affect the reported amounts of assets, liabilities and components of stockholder's equity or deficit as of the dates of the consolidated balance sheets, as well as the reported amounts of revenue, expenses and components of cash flows during the periods presented in our consolidated statements of operations, our consolidated statements of comprehensive income and our consolidated statements of cash flows. We also make estimates in our assessments of potential losses in relation to threatened or pending tax and legal matters. See Note 12—Income Taxes and Note 16—Commitments and Contingencies for additional information. For matters not related to income taxes, if a loss is considered probable and the amount can be reasonably estimated, we recognize an expense for the estimated loss. If we have the potential to recover a portion of the estimated loss from a third party, we make a separate assessment of recoverability and reduce the estimated loss if recovery is also deemed probable. For matters related to income taxes, if we determine that the impact of an uncertain tax position is more likely than not to be sustained upon audit by the relevant taxing authority, then we recognize a benefit for the largest amount that is more likely than not to be sustained. No portion of an uncertain tax position will be recognized if the position has less than a 50% likelihood of being sustained. Interest is recognized on the amount of unrecognized benefit from uncertain tax positions. For all of these and other matters, actual results could differ from our estimates. Revenue Recognition We recognize revenue for services when the related services are provided. Recognition of certain payments received in advance of services being provided is deferred until the service is provided. These advance payments include activation and installation charges, which we recognize as revenue over the expected customer relationship period, which ranges from eighteen months to over ten years depending on the service. We also defer costs for customer activations and installations. The deferral of customer activation and installation costs is limited to the amount of revenue deferred on advance payments. Costs in excess of advance payments are recorded as expense in the period such costs are incurred. Expected customer relationship periods are estimated using historical experience. Termination fees or other fees on existing contracts that are negotiated in conjunction with new contracts are deferred and recognized over the new contract term. We offer bundle discounts to our customers who receive certain groupings of services. These bundle discounts are recognized concurrently with the associated revenues and are allocated to the various services in the bundled offering based on the estimated selling price of services included in each bundled combination. Customer arrangements that include both equipment and services are evaluated to determine whether the elements are separable. If the elements are deemed separable and separate earnings processes exist, the revenue associated with the customer arrangement is allocated to each element based on the relative estimated selling price of the separate elements. We have estimated the selling prices of each element by reference to vendor-specific objective evidence of selling prices when the elements are sold separately. The revenue associated with each element is then recognized as earned. For example, if we receive an advance payment when we sell equipment and continuing service together, we immediately recognize as revenue the amount allocated to the equipment as long as all the conditions for revenue recognition have been satisfied. The portion of the advance payment allocated to the service based upon its relative selling price is recognized ratably over the longer of the contractual period or the expected customer relationship period. We periodically transfer optical capacity assets on our network to other telecommunications service carriers. These transactions are structured as indefeasible rights of use, commonly referred to as IRUs, which are the exclusive right to use a specified amount of capacity or fiber for a specified term, typically 20 years. We account for the cash consideration received on transfers of optical capacity assets and on all of the other elements deliverable under an IRU, as revenue ratably over the term of the agreement. We have not recognized revenue on any contemporaneous exchanges of our optical capacity assets for other optical capacity assets. In connection with offering products and services provided by third-party vendors, we review the relationship between us, the vendor and the end customer to assess whether revenue should be reported on a gross or net basis. In assessing whether revenue should be reported on a gross or net basis, we consider whether we act as a principal in the transaction, take title to the products, have risk and rewards of ownership or act as an agent or broker. Based on CenturyLink's agreements with DIRECTV and Verizon Wireless, we offer these services through sales agency relationships which are reported on a net basis. Affiliate Transactions We provide to our affiliates telecommunications services that we also provide to external customers. In addition, we provide to our affiliates computer system development and support services. Services provided by us to our affiliates are recognized as operating revenue-affiliates on our consolidated statements of operations. We also purchase services from our affiliates including telecommunications services, marketing and employee-related support services. Services provided to us from our affiliates are recognized as operating expenses-affiliates on our consolidated statements of operations. Because of the significance of the services we provide to our affiliates and our affiliates provide to us, the results of operations, financial position and cash flows presented herein are not necessarily indicative of the results of operations, financial position and cash flows we would have achieved had we operated as a stand-alone entity during the periods presented. We record intercompany charges at the amounts billed to us by our affiliates. Regulatory rules require certain expenses to be recorded at market price or fully distributed cost. Our compliance with regulations is subject to review by regulators. Adjustments to intercompany charges that result from these reviews are recorded in the period they become known. CenturyLink has cash management arrangements between certain of its subsidiaries that include lines of credit, affiliate obligations, capital contributions and dividends. As part of these cash management arrangements, an affiliate provides lines of credit to certain other affiliates. Amounts outstanding under these lines of credit and intercompany obligations vary from time to time. Under these arrangements, the majority of our cash balance is transferred on a daily basis to CenturyLink and most affiliate transactions are deemed to be settled at the time the transactions are recorded in our accounting records, with the resulting net balance at the end of each period reflected as advances to affiliates on the accompanying consolidated balance sheets. From time to time we declare and pay dividends to our parent, QSC, which are settled through the advances to affiliates, which has the net effect of reducing the amount of these advances. Dividends declared are reflected on our consolidated statements of stockholder's equity (deficit) and the consolidated statements of cash flows reflects the changes in advances to affiliates as investing activities and changes in advances from affiliates as financing activities. Interest is assessed on the advances to/from affiliates on either the three-month U.S T-bill rate (for advances to affiliates) or CenturyLink’s weighted average borrowing rate (for advances from affiliates). The affiliate obligations, net in noncurrent liabilities on the consolidated balance sheets represents the cumulative allocation of expense associated with QCII’s pension plans and CenturyLink’s post-retirement benefits plans. Changes in the affiliate obligation, net are reflected in operating activities on our consolidated statements of cash flows. In the normal course of business, we transfer assets to and from various affiliates through our parent, QSC, which are recorded through our equity. It is our policy to record asset transfers based on carrying values. We recorded $28 million of noncash dividends associated with asset transfers to QSC during the successor nine months ended December 31, 2011. USF, Gross Receipts Taxes and Other Surcharges In determining whether to include in our revenue and expenses the taxes and surcharges collected from customers and remitted to government authorities, including Universal Service Fund ("USF") charges, sales, use, value added and some excise taxes, we assess, among other things, whether we are the primary obligor or principal taxpayer for the taxes assessed in each jurisdiction where we do business. In jurisdictions where we determine that we are the principal taxpayer, we record the surcharges on a gross basis and include them in our revenue and costs of services and products. In jurisdictions where we determine that we are merely a collection agent for the government authority, we record the taxes on a net basis and do not include them in our revenue and costs of services and products. Advertising Costs Costs related to advertising are expensed as incurred and is included in selling general and administrative expenses in our consolidated statements of operations. Our advertising expense was $88 million for the successor year ended December 31, 2013, $90 million for the successor year ended December 31, 2012, $174 million for the successor nine months ended December 31, 2011, and $65 million for the predecessor three months ended March 31, 2011. Legal Costs In the normal course of our business, we incur costs to hire and retain external legal counsel to advise us on regulatory, litigation and other matters. We expense these costs as the related services are received. Income Taxes Effective April 1, 2011, our results are included in the CenturyLink consolidated federal income tax return and certain combined state income tax returns. CenturyLink allocates income tax expense to us based upon a separate return allocation method which results in income tax expense that approximates the expense that would result if we were a stand-alone entity. Our reported deferred tax assets and liabilities, as discussed below and in Note 12—Income Taxes, are primarily determined as a result of the application of the separate return allocation method and therefore the settlement of these amounts is dependent upon our parent, CenturyLink, rather than tax authorities. Our current expectation is that the vast majority of deferred tax assets and liabilities will be settled through our general intercompany obligation based upon the current CenturyLink policy. CenturyLink has the right to change their policy regarding settlement of these assets and liabilities at any time. The provision for income taxes consists of an amount for taxes currently payable, an amount for tax consequences deferred to future periods, adjustments to our liabilities for uncertain tax positions and amortization of investment tax credits. We record deferred income tax assets and liabilities reflecting future tax consequences attributable to differences between the financial statement carrying value of assets and liabilities and the tax bases of those assets and liabilities. Deferred taxes are computed using enacted tax rates expected to apply in the year in which the differences are expected to affect taxable income. The effect on deferred income tax assets and liabilities of a change in tax rate is recognized in earnings in the period that includes the enactment date. We establish valuation allowances when necessary to reduce deferred income tax assets to the amounts that we believe are more likely than not to be recovered. Each quarter we evaluate the need to retain all or a portion of the valuation allowance on our deferred tax assets. See Note 12—Income Taxes for additional information. Cash and Cash Equivalents Cash and cash equivalents include highly liquid investments that are readily convertible into cash and are not subject to significant risk from fluctuations in interest rates. As a result, the value at which cash and cash equivalents are reported in our consolidated financial statements approximates their fair value. Subsequent to CenturyLink's indirect acquisition of us, our cash collections are transferred to CenturyLink on a daily basis and our ultimate parent funds our cash disbursement needs. The net cash transferred to CenturyLink has been reflected as advances to affiliates in our consolidated balance sheets. Accounts Receivable and Allowance for Doubtful Accounts Accounts receivable are recognized based upon the amount due from customers for the services provided or at cost for purchased and other receivables less an allowance for doubtful accounts. The allowance for doubtful accounts receivable reflects our best estimate of probable losses inherent in our receivable portfolio determined on the basis of historical experience, specific allowances for known troubled accounts and other currently available evidence. We generally consider our accounts past due if they are outstanding over 30 days. Our collection process varies by the customer segment, amount of the receivable, and our evaluation of the customer's credit risk. Our past due accounts are written off against our allowance for doubtful accounts when collection is considered to be not probable. Any recoveries of accounts previously written off are generally recognized as a reduction in bad debt expense in the period received. The carrying value of accounts receivable net of the allowance for doubtful accounts approximates fair value. Property, Plant and Equipment As a result of CenturyLink's indirect acquisition of us, the purchase price was allocated to the assets acquired and liabilities assumed based on their estimated fair values at the date of acquisition. Therefore, the allocated fair values of the assets represent their new basis of accounting in our consolidated financial statements. This resulted in adjustments to our property, plant and equipment accounts, including accumulated depreciation at the acquisition date. The adjustments related to CenturyLink's indirect acquisition of us are described in Note 2—Acquisition of QCII by CenturyLink and Note 6—Property, Plant and Equipment. Purchased and constructed property, plant and equipment is stated at original cost. Property, plant and equipment is depreciated primarily using the straight-line group method. Under the straight-line group method, assets dedicated to providing telecommunications services (which comprise the majority of our property, plant and equipment) that have similar physical characteristics, use and expected useful lives are categorized in the year acquired on the basis of equal life groups for purposes of depreciation and tracking. Generally, under the straight-line group method, when an asset is sold or retired in the course of normal business activities, the cost is deducted from property, plant and equipment and charged to accumulated depreciation without recognition of a gain or loss. A gain or loss is recognized in our consolidated statements of operations only if a disposal is abnormal or unusual. Leasehold improvements are amortized over the shorter of the useful lives of the assets or the expected lease term. Expenditures for maintenance and repairs are expensed as incurred. Interest is capitalized during the construction phase of network and other internal-use capital projects. Employee-related costs for construction of network and other internal use assets are also capitalized during the construction phase. Property, plant and equipment supplies used internally are carried at average cost, except for significant individual items for which cost is based on specific identification. We perform annual internal reviews to evaluate the reasonableness of the depreciable lives for our property, plant and equipment. Our reviews utilize models that take into account actual usage, physical wear and tear, replacement history, assumptions about technology evolution and, in certain instances, actuarially determined probabilities to estimate the remaining life of our asset base. We review long-lived tangible assets for impairment whenever facts and circumstances indicate that the carrying amounts of the assets may not be recoverable. For assessment purposes, long-lived tangible assets are grouped with other assets and liabilities at the lowest level for which identifiable cash flows are largely independent of the cash flows of other assets and liabilities, absent a material change in operations. An impairment loss is recognized only if the carrying amount of the asset group is not recoverable and exceeds its fair value. Recoverability of the asset group to be held and used is assessed by comparing the carrying amount of the asset group to the estimated undiscounted future net cash flows expected to be generated by the asset group. If the asset group's carrying value is not recoverable, an impairment charge is recognized for the amount by which the carrying amount of the asset group exceeds its fair value. We determine fair values by using a combination of comparable market values and discounted cash flows, as appropriate. Goodwill, Customer Relationships and Other Intangible Assets Intangible assets arising from business combinations, such as goodwill, customer relationships and capitalized software are initially recorded at estimated fair value. We amortize customer relationships primarily over an estimated life of ten years, using either the sum-of-the-years-digits or the straight-line methods, depending on the type of customer. We amortize capitalized software using the straight-line method over estimated lives ranging up to seven years. Other intangible assets not arising from business combinations are initially recorded at cost. We review long-lived intangible assets, other than goodwill, for impairment whenever facts and circumstances indicate that the carrying amounts of the assets may not be recoverable. As a result of CenturyLink's indirect acquisition of us, the software used by us for internal use was adjusted to fair value as of the acquisition date. During the predecessor and successor periods internally used software, whether purchased or developed by us is capitalized. We capitalize certain costs associated with software such as costs of employees devoting time to the projects and external direct costs for materials and services. Costs associated with software to be used for internal purposes are expensed until the point at which the project has reached the development stage. Subsequent additions, modifications or upgrades to internal-use software are capitalized only to the extent that they allow the software to perform a task it previously did not perform. Software maintenance, data conversion and training costs are expensed in the period in which they are incurred. We review the remaining economic lives of our capitalized software annually. Capitalized software is included in other intangible assets, net, in our consolidated balance sheets. We assess customer relationships for impairment whenever facts and circumstances indicate that the carrying amount may not be recoverable. An impairment loss is recognized only if the carrying amount is not recoverable and exceeds its fair value. Recoverability of the our customer relationships is measured by comparing the carrying amount to the estimated undiscounted future net cash flows expected to be generated by them. If the customer relationship's carrying value is not recoverable, an impairment charge is recognized for the amount by which the carrying amount exceeds its fair value. We determine fair values by using the discounted cash flows method. We are required to assess goodwill for impairment at least annually, or more frequently, if events or a change in circumstances indicate that an impairment may have occurred. We are required to write-down the value of goodwill only in periods in which the recorded amount of goodwill exceeds the implied fair value of goodwill. Our annual assessment date for assessing goodwill impairment was September 30. The impairment assessment is at the reporting unit level, and in reviewing the criteria for reporting units when assigning the goodwill resulting from CenturyLink's indirect acquisition of us, we have determined that our operations consist of one reporting unit, consistent with our determination that our business consists of one operating segment. See Note 3—Goodwill, Customer Relationships and Other Intangible Assets for additional information. During the fourth quarter of 2013, we elected to change the date of our annual assessment of goodwill impairment from September 30 to October 31. This is a change in method of applying an accounting principle which management believes is a preferable alternative as the new date of the assessment is more closely aligned with our strategic planning process. The change in the assessment date did not delay, accelerate or avoid a potential impairment charge in 2013. We performed our annual goodwill impairment assessment at September 30, 2013, prior to the change in our annual assessment date. We then performed a qualitative assessment of our goodwill as of October 31 and concluded that our goodwill was not impaired as of either date. Pension and Post-Retirement Benefits A substantial portion of our employees participate in the QCII pension plan. QCII also maintains a non-qualified pension plan for certain of our eligible highly compensated employees. In addition, certain employees may become eligible to participate in CenturyLink's post-retirement health care and life insurance benefit plans. CenturyLink and QCII allocate income and expenses relating to pension, non-qualified pension, and post-retirement health care and life insurance benefits . The amounts contributed by us through CenturyLink and QCII are not segregated or restricted to pay amounts due to our employees and may be used to provide benefits to other employees of CenturyLink and QCII's affiliates. The allocation of expense to us is based upon the demographics of our employees and retirees compared to all the remaining participants. For further information on pension, non-qualified pension, post-retirement and other post-employment benefit plans, see CenturyLink's Annual Report on Form 10-K for the year ended December 31, 2013.

Basis of Presentation and Summary of Significant Accounting Policies

Basis of Presentation

We are an integrated communications company engaged primarily in providing an array of communications services to our residential, business, governmental and wholesale customers. Our communications services include local, broadband, private line (including special access), network access, Ethernet, wireless and video services. In certain local and regional markets, we also provide local access and fiber transport services to competitive local exchange carriers.

We generate the majority of our revenues from services provided in the 14-state region of Arizona, Colorado, Idaho, Iowa, Minnesota, Montana, Nebraska, New Mexico, North Dakota, Oregon, South Dakota, Utah, Washington, and Wyoming. We refer to this region as our local service area.

On April 1, 2011, our indirect parent QCII became a wholly owned subsidiary of CenturyLink, Inc. in a tax-free, stock-for-stock transaction. Although we have continued as a surviving corporation and legal entity since the acquisition, the accompanying consolidated statements of operations, comprehensive income, cash flows and stockholder's equity (deficit) are presented for two periods: predecessor and successor, which relate to the period preceding the acquisition and the period succeeding the acquisition, respectively. On the date of the acquisition, April 1, 2011, our assets and liabilities were recognized at their fair value. This revaluation has been reflected in our consolidated financial statements and, therefore, has resulted in a new basis of accounting for the "successor period". This new basis of accounting means that our consolidated financial statements for the successor periods are not comparable to our consolidated financial statements relating to periods prior to the acquisition, including the predecessor period consolidated financial statements in this annual report.

The accompanying consolidated financial statements include our accounts and the accounts of our subsidiaries over which we exercise control. All intercompany amounts and transactions with our consolidated subsidiaries have been eliminated.

Effective January 1, 2012, in connection with post-acquisition systems integration activities, we adopted the affiliate expense allocation methodology used by our ultimate parent. This methodology results in certain overhead costs incurred by us and by our direct parent that were previously assessed to us on a net basis now being assessed on a gross basis both to and from our ultimate parent, resulting in both higher affiliate revenues and expenses for us. This change resulting from systems integration activities did not have a significant impact to our consolidated net income for the successor years ended December 31, 2013 and 2012.

During the year ended December 31, 2013, we recorded a correction of an error related to an understatement of our current deferred tax asset, an understatement of our deferred tax liabilities and an overstatement of goodwill recorded in connection with the purchase accounting of us in 2011. Therefore, we recognized a $17 million increase to current deferred income tax asset, a $2 million increase to noncurrent deferred income tax liability and a $15 million reduction to goodwill on our consolidated balance sheet as of December 31, 2012. The correction of the error did not have an effect on our consolidated statements of operations or on our consolidated statements of cash flows for the years ended December 31, 2012 and 2011.

During the first quarter of 2012, in connection with post-acquisition systems integration activities, CenturyLink changed certain cash management processes applicable to us. Therefore, we now present the balances related to these cash management transactions on a net basis with our other affiliate transactions.

During the first quarter of 2012, we recognized a $100 million equity contribution for the tax benefit associated with a deduction for pension funding. Since we are the employer of a significant percentage of the participants and none of the 2011 QCII pension funding was allocated to us, a tax deduction was recognized on our separate company tax return and, therefore, we recognized an equity contribution for the tax benefits associated with this deduction.

Effective January 1, 2012, we changed our rates of capitalized labor as we transitioned certain legacy systems to the historical systems of our ultimate parent, CenturyLink. This transition resulted in an estimated $40 million to $55 million increase in the amount of labor capitalized as an asset compared to the amount that would have been capitalized if we had continued to use our legacy systems and a corresponding estimated $40 million to $55 million decrease in operating expenses for the successor year ended December 31, 2012. The reduction in expenses described above, net of tax, increased net income approximately $25 million to $34 million for the successor year ended December 31, 2012.

Effective January 1, 2012, we changed our estimates of the remaining useful lives and net salvage value for certain telecommunications equipment. These changes resulted in a decrease to depreciation expense of approximately $52 million for the successor year ended December 31, 2012. This decrease in depreciation expense, net of tax, had the effect of increasing net income by approximately $32 million for the successor year ended December 31, 2012.

Effective January 2014, we will change the estimates of the remaining economic lives of certain switch and circuit network equipment. We estimate this will result in a net increase in depreciation expense in our consolidated statements of operations of $19 million for the year ended December 31, 2014.

We also reclassified certain other prior period amounts to conform to the current period presentation. These changes had no impact on total operating expenses or net income for any period.

Summary of Significant Accounting Policies

Use of Estimates

Our consolidated financial statements are prepared in accordance with U.S. generally accepted accounting principles. These accounting principles require us to make certain estimates, judgments and assumptions. We believe that the estimates, judgments and assumptions we make when accounting for items and matters such as, but not limited to, long-term contracts, customer retention patterns, allowance for doubtful accounts, depreciation, amortization, asset valuations, internal labor capitalization rates, recoverability of assets (including deferred tax assets), impairment assessments, pension, post-retirement and other post-employment benefits, taxes, certain liabilities and other provisions and contingencies are reasonable, based on information available at the time they were made. Our accounting for CenturyLink's indirect acquisition of us required extensive use of estimates in determining the acquisition date fair values of our assets and liabilities. These estimates, judgments and assumptions can affect the reported amounts of assets, liabilities and components of stockholder's equity or deficit as of the dates of the consolidated balance sheets, as well as the reported amounts of revenue, expenses and components of cash flows during the periods presented in our consolidated statements of operations, our consolidated statements of comprehensive income and our consolidated statements of cash flows. We also make estimates in our assessments of potential losses in relation to threatened or pending tax and legal matters. See Note 12—Income Taxes and Note 16—Commitments and Contingencies for additional information.

For matters not related to income taxes, if a loss is considered probable and the amount can be reasonably estimated, we recognize an expense for the estimated loss. If we have the potential to recover a portion of the estimated loss from a third party, we make a separate assessment of recoverability and reduce the estimated loss if recovery is also deemed probable.

For matters related to income taxes, if we determine that the impact of an uncertain tax position is more likely than not to be sustained upon audit by the relevant taxing authority, then we recognize a benefit for the largest amount that is more likely than not to be sustained. No portion of an uncertain tax position will be recognized if the position has less than a 50% likelihood of being sustained. Interest is recognized on the amount of unrecognized benefit from uncertain tax positions.

For all of these and other matters, actual results could differ from our estimates.

Revenue Recognition

We recognize revenue for services when the related services are provided. Recognition of certain payments received in advance of services being provided is deferred until the service is provided. These advance payments include activation and installation charges, which we recognize as revenue over the expected customer relationship period, which ranges from eighteen months to over ten years depending on the service. We also defer costs for customer activations and installations. The deferral of customer activation and installation costs is limited to the amount of revenue deferred on advance payments. Costs in excess of advance payments are recorded as expense in the period such costs are incurred. Expected customer relationship periods are estimated using historical experience. Termination fees or other fees on existing contracts that are negotiated in conjunction with new contracts are deferred and recognized over the new contract term.

We offer bundle discounts to our customers who receive certain groupings of services. These bundle discounts are recognized concurrently with the associated revenues and are allocated to the various services in the bundled offering based on the estimated selling price of services included in each bundled combination.

Customer arrangements that include both equipment and services are evaluated to determine whether the elements are separable. If the elements are deemed separable and separate earnings processes exist, the revenue associated with the customer arrangement is allocated to each element based on the relative estimated selling price of the separate elements. We have estimated the selling prices of each element by reference to vendor-specific objective evidence of selling prices when the elements are sold separately. The revenue associated with each element is then recognized as earned. For example, if we receive an advance payment when we sell equipment and continuing service together, we immediately recognize as revenue the amount allocated to the equipment as long as all the conditions for revenue recognition have been satisfied. The portion of the advance payment allocated to the service based upon its relative selling price is recognized ratably over the longer of the contractual period or the expected customer relationship period.

We periodically transfer optical capacity assets on our network to other telecommunications service carriers. These transactions are structured as indefeasible rights of use, commonly referred to as IRUs, which are the exclusive right to use a specified amount of capacity or fiber for a specified term, typically 20 years. We account for the cash consideration received on transfers of optical capacity assets and on all of the other elements deliverable under an IRU, as revenue ratably over the term of the agreement. We have not recognized revenue on any contemporaneous exchanges of our optical capacity assets for other optical capacity assets.

In connection with offering products and services provided by third-party vendors, we review the relationship between us, the vendor and the end customer to assess whether revenue should be reported on a gross or net basis. In assessing whether revenue should be reported on a gross or net basis, we consider whether we act as a principal in the transaction, take title to the products, have risk and rewards of ownership or act as an agent or broker. Based on CenturyLink's agreements with DIRECTV and Verizon Wireless, we offer these services through sales agency relationships which are reported on a net basis.

Affiliate Transactions

We provide to our affiliates telecommunications services that we also provide to external customers. In addition, we provide to our affiliates computer system development and support services. Services provided by us to our affiliates are recognized as operating revenue-affiliates on our consolidated statements of operations. We also purchase services from our affiliates including telecommunications services, marketing and employee-related support services. Services provided to us from our affiliates are recognized as operating expenses-affiliates on our consolidated statements of operations. Because of the significance of the services we provide to our affiliates and our affiliates provide to us, the results of operations, financial position and cash flows presented herein are not necessarily indicative of the results of operations, financial position and cash flows we would have achieved had we operated as a stand-alone entity during the periods presented.

We record intercompany charges at the amounts billed to us by our affiliates. Regulatory rules require certain expenses to be recorded at market price or fully distributed cost. Our compliance with regulations is subject to review by regulators. Adjustments to intercompany charges that result from these reviews are recorded in the period they become known.

CenturyLink has cash management arrangements between certain of its subsidiaries that include lines of credit, affiliate obligations, capital contributions and dividends. As part of these cash management arrangements, an affiliate provides lines of credit to certain other affiliates. Amounts outstanding under these lines of credit and intercompany obligations vary from time to time. Under these arrangements, the majority of our cash balance is transferred on a daily basis to CenturyLink and most affiliate transactions are deemed to be settled at the time the transactions are recorded in our accounting records, with the resulting net balance at the end of each period reflected as advances to affiliates on the accompanying consolidated balance sheets. From time to time we declare and pay dividends to our parent, QSC, which are settled through the advances to affiliates, which has the net effect of reducing the amount of these advances. Dividends declared are reflected on our consolidated statements of stockholder's equity (deficit) and the consolidated statements of cash flows reflects the changes in advances to affiliates as investing activities and changes in advances from affiliates as financing activities. Interest is assessed on the advances to/from affiliates on either the three-month U.S T-bill rate (for advances to affiliates) or CenturyLink’s weighted average borrowing rate (for advances from affiliates).

The affiliate obligations, net in noncurrent liabilities on the consolidated balance sheets represents the cumulative allocation of expense associated with QCII’s pension plans and CenturyLink’s post-retirement benefits plans. Changes in the affiliate obligation, net are reflected in operating activities on our consolidated statements of cash flows.

In the normal course of business, we transfer assets to and from various affiliates through our parent, QSC, which are recorded through our equity. It is our policy to record asset transfers based on carrying values. We recorded $28 million of noncash dividends associated with asset transfers to QSC during the successor nine months ended December 31, 2011.

USF, Gross Receipts Taxes and Other Surcharges

In determining whether to include in our revenue and expenses the taxes and surcharges collected from customers and remitted to government authorities, including Universal Service Fund ("USF") charges, sales, use, value added and some excise taxes, we assess, among other things, whether we are the primary obligor or principal taxpayer for the taxes assessed in each jurisdiction where we do business. In jurisdictions where we determine that we are the principal taxpayer, we record the surcharges on a gross basis and include them in our revenue and costs of services and products.

In jurisdictions where we determine that we are merely a collection agent for the government authority, we record the taxes on a net basis and do not include them in our revenue and costs of services and products.

Advertising Costs

Costs related to advertising are expensed as incurred and is included in selling general and administrative expenses in our consolidated statements of operations. Our advertising expense was $88 million for the successor year ended December 31, 2013, $90 million for the successor year ended December 31, 2012, $174 million for the successor nine months ended December 31, 2011, and $65 million for the predecessor three months ended March 31, 2011.

Legal Costs

In the normal course of our business, we incur costs to hire and retain external legal counsel to advise us on regulatory, litigation and other matters. We expense these costs as the related services are received.

Income Taxes

Effective April 1, 2011, our results are included in the CenturyLink consolidated federal income tax return and certain combined state income tax returns. CenturyLink allocates income tax expense to us based upon a separate return allocation method which results in income tax expense that approximates the expense that would result if we were a stand-alone entity. Our reported deferred tax assets and liabilities, as discussed below and in Note 12—Income Taxes, are primarily determined as a result of the application of the separate return allocation method and therefore the settlement of these amounts is dependent upon our parent, CenturyLink, rather than tax authorities. Our current expectation is that the vast majority of deferred tax assets and liabilities will be settled through our general intercompany obligation based upon the current CenturyLink policy. CenturyLink has the right to change their policy regarding settlement of these assets and liabilities at any time.

The provision for income taxes consists of an amount for taxes currently payable, an amount for tax consequences deferred to future periods, adjustments to our liabilities for uncertain tax positions and amortization of investment tax credits. We record deferred income tax assets and liabilities reflecting future tax consequences attributable to differences between the financial statement carrying value of assets and liabilities and the tax bases of those assets and liabilities. Deferred taxes are computed using enacted tax rates expected to apply in the year in which the differences are expected to affect taxable income. The effect on deferred income tax assets and liabilities of a change in tax rate is recognized in earnings in the period that includes the enactment date.

We establish valuation allowances when necessary to reduce deferred income tax assets to the amounts that we believe are more likely than not to be recovered. Each quarter we evaluate the need to retain all or a portion of the valuation allowance on our deferred tax assets. See Note 12—Income Taxes for additional information.

Cash and Cash Equivalents

Cash and cash equivalents include highly liquid investments that are readily convertible into cash and are not subject to significant risk from fluctuations in interest rates. As a result, the value at which cash and cash equivalents are reported in our consolidated financial statements approximates their fair value. Subsequent to CenturyLink's indirect acquisition of us, our cash collections are transferred to CenturyLink on a daily basis and our ultimate parent funds our cash disbursement needs. The net cash transferred to CenturyLink has been reflected as advances to affiliates in our consolidated balance sheets.

Accounts Receivable and Allowance for Doubtful Accounts

Accounts receivable are recognized based upon the amount due from customers for the services provided or at cost for purchased and other receivables less an allowance for doubtful accounts. The allowance for doubtful accounts receivable reflects our best estimate of probable losses inherent in our receivable portfolio determined on the basis of historical experience, specific allowances for known troubled accounts and other currently available evidence. We generally consider our accounts past due if they are outstanding over 30 days. Our collection process varies by the customer segment, amount of the receivable, and our evaluation of the customer's credit risk. Our past due accounts are written off against our allowance for doubtful accounts when collection is considered to be not probable. Any recoveries of accounts previously written off are generally recognized as a reduction in bad debt expense in the period received. The carrying value of accounts receivable net of the allowance for doubtful accounts approximates fair value.

Property, Plant and Equipment

As a result of CenturyLink's indirect acquisition of us, the purchase price was allocated to the assets acquired and liabilities assumed based on their estimated fair values at the date of acquisition. Therefore, the allocated fair values of the assets represent their new basis of accounting in our consolidated financial statements. This resulted in adjustments to our property, plant and equipment accounts, including accumulated depreciation at the acquisition date. The adjustments related to CenturyLink's indirect acquisition of us are described in Note 2—Acquisition of QCII by CenturyLink and Note 6—Property, Plant and Equipment.

Purchased and constructed property, plant and equipment is stated at original cost. Property, plant and equipment is depreciated primarily using the straight-line group method. Under the straight-line group method, assets dedicated to providing telecommunications services (which comprise the majority of our property, plant and equipment) that have similar physical characteristics, use and expected useful lives are categorized in the year acquired on the basis of equal life groups for purposes of depreciation and tracking. Generally, under the straight-line group method, when an asset is sold or retired in the course of normal business activities, the cost is deducted from property, plant and equipment and charged to accumulated depreciation without recognition of a gain or loss. A gain or loss is recognized in our consolidated statements of operations only if a disposal is abnormal or unusual. Leasehold improvements are amortized over the shorter of the useful lives of the assets or the expected lease term. Expenditures for maintenance and repairs are expensed as incurred. Interest is capitalized during the construction phase of network and other internal-use capital projects. Employee-related costs for construction of network and other internal use assets are also capitalized during the construction phase. Property, plant and equipment supplies used internally are carried at average cost, except for significant individual items for which cost is based on specific identification.

We perform annual internal reviews to evaluate the reasonableness of the depreciable lives for our property, plant and equipment. Our reviews utilize models that take into account actual usage, physical wear and tear, replacement history, assumptions about technology evolution and, in certain instances, actuarially determined probabilities to estimate the remaining life of our asset base.

We review long-lived tangible assets for impairment whenever facts and circumstances indicate that the carrying amounts of the assets may not be recoverable. For assessment purposes, long-lived tangible assets are grouped with other assets and liabilities at the lowest level for which identifiable cash flows are largely independent of the cash flows of other assets and liabilities, absent a material change in operations. An impairment loss is recognized only if the carrying amount of the asset group is not recoverable and exceeds its fair value. Recoverability of the asset group to be held and used is assessed by comparing the carrying amount of the asset group to the estimated undiscounted future net cash flows expected to be generated by the asset group. If the asset group's carrying value is not recoverable, an impairment charge is recognized for the amount by which the carrying amount of the asset group exceeds its fair value. We determine fair values by using a combination of comparable market values and discounted cash flows, as appropriate.

Goodwill, Customer Relationships and Other Intangible Assets

Intangible assets arising from business combinations, such as goodwill, customer relationships and capitalized software are initially recorded at estimated fair value. We amortize customer relationships primarily over an estimated life of ten years, using either the sum-of-the-years-digits or the straight-line methods, depending on the type of customer. We amortize capitalized software using the straight-line method over estimated lives ranging up to seven years. Other intangible assets not arising from business combinations are initially recorded at cost. We review long-lived intangible assets, other than goodwill, for impairment whenever facts and circumstances indicate that the carrying amounts of the assets may not be recoverable.

As a result of CenturyLink's indirect acquisition of us, the software used by us for internal use was adjusted to fair value as of the acquisition date. During the predecessor and successor periods internally used software, whether purchased or developed by us is capitalized. We capitalize certain costs associated with software such as costs of employees devoting time to the projects and external direct costs for materials and services. Costs associated with software to be used for internal purposes are expensed until the point at which the project has reached the development stage. Subsequent additions, modifications or upgrades to internal-use software are capitalized only to the extent that they allow the software to perform a task it previously did not perform. Software maintenance, data conversion and training costs are expensed in the period in which they are incurred. We review the remaining economic lives of our capitalized software annually. Capitalized software is included in other intangible assets, net, in our consolidated balance sheets.

We assess customer relationships for impairment whenever facts and circumstances indicate that the carrying amount may not be recoverable. An impairment loss is recognized only if the carrying amount is not recoverable and exceeds its fair value. Recoverability of the our customer relationships is measured by comparing the carrying amount to the estimated undiscounted future net cash flows expected to be generated by them. If the customer relationship's carrying value is not recoverable, an impairment charge is recognized for the amount by which the carrying amount exceeds its fair value. We determine fair values by using the discounted cash flows method.

We are required to assess goodwill for impairment at least annually, or more frequently, if events or a change in circumstances indicate that an impairment may have occurred. We are required to write-down the value of goodwill only in periods in which the recorded amount of goodwill exceeds the implied fair value of goodwill. Our annual assessment date for assessing goodwill impairment was September 30. The impairment assessment is at the reporting unit level, and in reviewing the criteria for reporting units when assigning the goodwill resulting from CenturyLink's indirect acquisition of us, we have determined that our operations consist of one reporting unit, consistent with our determination that our business consists of one operating segment. See Note 3—Goodwill, Customer Relationships and Other Intangible Assets for additional information.

During the fourth quarter of 2013, we elected to change the date of our annual assessment of goodwill impairment from September 30 to October 31. This is a change in method of applying an accounting principle which management believes is a preferable alternative as the new date of the assessment is more closely aligned with our strategic planning process. The change in the assessment date did not delay, accelerate or avoid a potential impairment charge in 2013. We performed our annual goodwill impairment assessment at September 30, 2013, prior to the change in our annual assessment date. We then performed a qualitative assessment of our goodwill as of October 31 and concluded that our goodwill was not impaired as of either date.

Pension and Post-Retirement Benefits

A substantial portion of our employees participate in the QCII pension plan. QCII also maintains a non-qualified pension plan for certain of our eligible highly compensated employees. In addition, certain employees may become eligible to participate in CenturyLink's post-retirement health care and life insurance benefit plans. CenturyLink and QCII allocate income and expenses relating to pension, non-qualified pension, and post-retirement health care and life insurance benefits . The amounts contributed by us through CenturyLink and QCII are not segregated or restricted to pay amounts due to our employees and may be used to provide benefits to other employees of CenturyLink and QCII's affiliates. The allocation of expense to us is based upon the demographics of our employees and retirees compared to all the remaining participants.

For further information on pension, non-qualified pension, post-retirement and other post-employment benefit plans, see CenturyLink's Annual Report on Form 10-K for the year ended December 31, 2013.