Basis of Presentation	9 Months Ended
Sep. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation General We are an integrated communications company engaged primarily in providing an array of services to our residential and business customers. Our communications services include local voice, broadband, private line (including special access), network access, Ethernet, information technology, video and other ancillary 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 total consolidated operating 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. Our consolidated balance sheet as of December 31, 2015, which was derived from our audited consolidated financial statements, and our unaudited interim consolidated financial statements provided herein have been prepared in accordance with the instructions for Form 10-Q. Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America have been condensed or omitted pursuant to rules and regulations of the Securities and Exchange Commission ("SEC"); however, in our opinion, the disclosures made are adequate to make the information presented not misleading. We believe that these consolidated financial statements include all normal recurring adjustments necessary to fairly present the results for the interim periods. The consolidated results of operations for the first nine months of the year are not necessarily indicative of the consolidated results of operations that might be expected for the entire year. These consolidated financial statements should be read in conjunction with the audited consolidated financial statements and the notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2015. The accompanying consolidated financial statements include our accounts and the accounts of our subsidiaries. Intercompany amounts and transactions with our consolidated subsidiaries have been eliminated. Transactions with our non-consolidated affiliates (referred to herein as affiliates) have not been eliminated. We reclassified certain prior period amounts to conform to the current period presentation, including the categorization of our revenues. See Note 4—Products and Services Revenues for additional information. These changes had no impact on total operating revenues, total operating expenses or net income for any period. Connect America Fund In 2015, CenturyLink accepted funding from the Federal Communications Commission's ("FCC") Connect America Fund ("CAF") of approximately $500 million per year for six years to fund the deployment of voice and broadband capable infrastructure for approximately 1.2 million rural households and businesses in 33 states under the CAF Phase 2 high-cost support program. The funding from the CAF Phase 2 support program in these 33 states will substantially supplant funding from the interstate Universal Service Fund ("USF") high-cost program that we previously utilized to support voice services in high-cost rural markets. Of these amounts, approximately $150 million per year is attributable to our service area, to provide service to approximately 0.3 million rural households and businesses in 13 states. In late 2015, we began receiving these support payments from the FCC under the new CAF Phase 2 support program, which included monthly support payments at a higher rate than under the interstate USF support program. We received a substantial one-time transitional payment of $50 million from the FCC in the third quarter of 2015, of which $42 million was attributable to the first six months of 2015. The transitional payment was designed to align the prior USF payments with the new CAF Phase 2 payments for the full year 2015. Consequently, we do not expect funding from the CAF Phase 2 support program (including the prior USF funding) to materially change our operating revenues for the full year 2016 when compared to the full year 2015. Recent Accounting Pronouncements Financial Instruments On June 16, 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2016-13, “Measurement of Credit Losses on Financial Instruments” (“ASU 2016-13”). The primary impact of ASU 2016-13 for us is a change in the model for the recognition of credit losses related to our financial instruments from an incurred loss model, which recognized credit losses only if it was probable that a loss had been incurred, to an expected loss model, which requires our management team to estimate the total credit losses expected on the portfolio of financial instruments. We are currently reviewing the requirements of the standard and evaluating the impact on our consolidated financial statements. We are required to adopt the provisions of ASU 2016-13 effective January 1, 2020, but could elect to early adopt the provisions as of January 1, 2019. We expect to recognize the impacts of adopting ASU 2016-13 through a cumulative adjustment to retained earnings as of the date of adoption. Share-based Compensation On March 30, 2016, the FASB issued ASU 2016-09, “Improvement to Employee Share-Based Payment Accounting" (“ASU 2016-09”). ASU 2016-09 modifies the accounting and associated income tax accounting for share-based compensation in order to reduce the cost and complexity associated with current generally accepted accounting principles. ASU 2016-09 is effective as of January 1, 2017, but early adoption may be elected. ASU 2016-09 includes different transition requirements for the different changes implemented, including some provisions which allow retrospective application. We will implement this new standard on its effective date, but we have not determined if we will retrospectively apply the requirements when allowed. The primary provisions of ASU 2016-09 that we expect will affect our financial statements are: 1) a reclassification of the tax effect associated with the difference between the expense recognized for share-based payments and the associated tax deduction from additional paid-in capital to income tax expense; 2) a reclassification of the tax effect associated with the difference between compensation expense and associated deduction from financing cash flow to operating cash flow; and 3) an optional accounting policy election to account for forfeitures of share-based payment grants as they occur as opposed to our current policy of estimating the forfeitures on the grant date. Although these provisions would not have had a material impact on our previously-issued financial statements, we cannot provide any assurance regarding their future impacts. Adoption of ASU 2016-09 may increase the volatility of income tax expense and cash flow from operating activities. Leases On February 25, 2016, the FASB issued ASU 2016-02, “Leases” (“ASU 2016-02”). The core principle of ASU 2016-02 will require lessees to present right-of-use assets and lease liabilities on their balance sheets for operating leases, which are currently not reflected on their balance sheets. ASU 2016-02 is effective for annual and interim periods beginning January 1, 2019. Early adoption of ASU 2016-02 is permitted. Upon adoption of ASU 2016-02, we are required to recognize and measure leases at the beginning of the earliest period presented in our consolidated financial statements using a modified retrospective approach. The modified retrospective approach includes a number of optional practical expedients that we may elect to apply. We have not yet decided when we will adopt ASU 2016-02 or which practical expedient options we will elect. We are currently evaluating our existing lease accounting systems to determine whether our current systems will support the new accounting requirements or if upgrades or new systems will be required, and we are in the process of developing an implementation plan. We are also currently evaluating and assessing the impact ASU 2016-02 will have on us and our consolidated financial statements. As of the date of this report, we cannot provide any estimate of the impact of adopting ASU 2016-02. Revenue Recognition On May 28, 2014, the FASB issued ASU 2014-09, “Revenue from Contracts with Customers” (“ASU 2014-09”). ASU 2014-09 replaces virtually all existing generally accepted accounting principles (“GAAP”) on revenue recognition and replaces them with a principles-based approach for determining revenue recognition using a new five step model. The core principle of ASU 2014-09 is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. ASU 2014-09 also includes new accounting principles related to the deferral and amortization of contract acquisition and fulfillment costs. We currently do not defer any contract acquisition costs and we defer contract fulfillment costs only up to the extent of any revenue deferred. On July 9, 2015, the FASB approved the deferral of the effective date of ASU 2014-09 by one year until January 1, 2018, which is the date we plan to adopt this standard. ASU 2014-09 may be adopted by applying the provisions of this standard on a retrospective basis to the periods included in the financial statements or on a modified retrospective basis which would result in the recognition of a cumulative effect of adopting ASU 2014-09 in the first quarter of 2018. We have not yet decided which implementation method we will adopt. We have completed our initial assessment of our business and systems requirements and we are currently developing and implementing a new revenue recognition system to comply with the requirements of ASU 2014-09. We continue to work on developing estimates of the impact of ASU 2014-09 on the timing of our revenue recognition but cannot currently provide a reasonably accurate estimate of its impact.

Basis of Presentation

General

We are an integrated communications company engaged primarily in providing an array of services to our residential and business customers. Our communications services include local voice, broadband, private line (including special access), network access, Ethernet, information technology, video and other ancillary 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 total consolidated operating 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.

Our consolidated balance sheet as of December 31, 2015, which was derived from our audited consolidated financial statements, and our unaudited interim consolidated financial statements provided herein have been prepared in accordance with the instructions for Form 10-Q. Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America have been condensed or omitted pursuant to rules and regulations of the Securities and Exchange Commission ("SEC"); however, in our opinion, the disclosures made are adequate to make the information presented not misleading. We believe that these consolidated financial statements include all normal recurring adjustments necessary to fairly present the results for the interim periods. The consolidated results of operations for the first nine months of the year are not necessarily indicative of the consolidated results of operations that might be expected for the entire year. These consolidated financial statements should be read in conjunction with the audited consolidated financial statements and the notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2015.

The accompanying consolidated financial statements include our accounts and the accounts of our subsidiaries. Intercompany amounts and transactions with our consolidated subsidiaries have been eliminated. Transactions with our non-consolidated affiliates (referred to herein as affiliates) have not been eliminated.

We reclassified certain prior period amounts to conform to the current period presentation, including the categorization of our revenues. See Note 4—Products and Services Revenues for additional information. These changes had no impact on total operating revenues, total operating expenses or net income for any period.

Connect America Fund

In 2015, CenturyLink accepted funding from the Federal Communications Commission's ("FCC") Connect America Fund ("CAF") of approximately $500 million per year for six years to fund the deployment of voice and broadband capable infrastructure for approximately 1.2 million rural households and businesses in 33 states under the CAF Phase 2 high-cost support program. The funding from the CAF Phase 2 support program in these 33 states will substantially supplant funding from the interstate Universal Service Fund ("USF") high-cost program that we previously utilized to support voice services in high-cost rural markets. Of these amounts, approximately $150 million per year is attributable to our service area, to provide service to approximately 0.3 million rural households and businesses in 13 states. In late 2015, we began receiving these support payments from the FCC under the new CAF Phase 2 support program, which included monthly support payments at a higher rate than under the interstate USF support program. We received a substantial one-time transitional payment of $50 million from the FCC in the third quarter of 2015, of which $42 million was attributable to the first six months of 2015. The transitional payment was designed to align the prior USF payments with the new CAF Phase 2 payments for the full year 2015. Consequently, we do not expect funding from the CAF Phase 2 support program (including the prior USF funding) to materially change our operating revenues for the full year 2016 when compared to the full year 2015.

Recent Accounting Pronouncements

Financial Instruments

On June 16, 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2016-13, “Measurement of Credit Losses on Financial Instruments” (“ASU 2016-13”). The primary impact of ASU 2016-13 for us is a change in the model for the recognition of credit losses related to our financial instruments from an incurred loss model, which recognized credit losses only if it was probable that a loss had been incurred, to an expected loss model, which requires our management team to estimate the total credit losses expected on the portfolio of financial instruments. We are currently reviewing the requirements of the standard and evaluating the impact on our consolidated financial statements.

We are required to adopt the provisions of ASU 2016-13 effective January 1, 2020, but could elect to early adopt the provisions as of January 1, 2019. We expect to recognize the impacts of adopting ASU 2016-13 through a cumulative adjustment to retained earnings as of the date of adoption.

Share-based Compensation

On March 30, 2016, the FASB issued ASU 2016-09, “Improvement to Employee Share-Based Payment Accounting" (“ASU 2016-09”). ASU 2016-09 modifies the accounting and associated income tax accounting for share-based compensation in order to reduce the cost and complexity associated with current generally accepted accounting principles. ASU 2016-09 is effective as of January 1, 2017, but early adoption may be elected. ASU 2016-09 includes different transition requirements for the different changes implemented, including some provisions which allow retrospective application. We will implement this new standard on its effective date, but we have not determined if we will retrospectively apply the requirements when allowed.

The primary provisions of ASU 2016-09 that we expect will affect our financial statements are: 1) a reclassification of the tax effect associated with the difference between the expense recognized for share-based payments and the associated tax deduction from additional paid-in capital to income tax expense; 2) a reclassification of the tax effect associated with the difference between compensation expense and associated deduction from financing cash flow to operating cash flow; and 3) an optional accounting policy election to account for forfeitures of share-based payment grants as they occur as opposed to our current policy of estimating the forfeitures on the grant date. Although these provisions would not have had a material impact on our previously-issued financial statements, we cannot provide any assurance regarding their future impacts. Adoption of ASU 2016-09 may increase the volatility of income tax expense and cash flow from operating activities.

Leases

On February 25, 2016, the FASB issued ASU 2016-02, “Leases” (“ASU 2016-02”). The core principle of ASU 2016-02 will require lessees to present right-of-use assets and lease liabilities on their balance sheets for operating leases, which are currently not reflected on their balance sheets.

ASU 2016-02 is effective for annual and interim periods beginning January 1, 2019. Early adoption of ASU 2016-02 is permitted. Upon adoption of ASU 2016-02, we are required to recognize and measure leases at the beginning of the earliest period presented in our consolidated financial statements using a modified retrospective approach. The modified retrospective approach includes a number of optional practical expedients that we may elect to apply. We have not yet decided when we will adopt ASU 2016-02 or which practical expedient options we will elect.

We are currently evaluating our existing lease accounting systems to determine whether our current systems will support the new accounting requirements or if upgrades or new systems will be required, and we are in the process of developing an implementation plan. We are also currently evaluating and assessing the impact ASU 2016-02 will have on us and our consolidated financial statements. As of the date of this report, we cannot provide any estimate of the impact of adopting ASU 2016-02.

Revenue Recognition

On May 28, 2014, the FASB issued ASU 2014-09, “Revenue from Contracts with Customers” (“ASU 2014-09”). ASU 2014-09 replaces virtually all existing generally accepted accounting principles (“GAAP”) on revenue recognition and replaces them with a principles-based approach for determining revenue recognition using a new five step model. The core principle of ASU 2014-09 is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. ASU 2014-09 also includes new accounting principles related to the deferral and amortization of contract acquisition and fulfillment costs. We currently do not defer any contract acquisition costs and we defer contract fulfillment costs only up to the extent of any revenue deferred.

On July 9, 2015, the FASB approved the deferral of the effective date of ASU 2014-09 by one year until January 1, 2018, which is the date we plan to adopt this standard. ASU 2014-09 may be adopted by applying the provisions of this standard on a retrospective basis to the periods included in the financial statements or on a modified retrospective basis which would result in the recognition of a cumulative effect of adopting ASU 2014-09 in the first quarter of 2018. We have not yet decided which implementation method we will adopt. We have completed our initial assessment of our business and systems requirements and we are currently developing and implementing a new revenue recognition system to comply with the requirements of ASU 2014-09. We continue to work on developing estimates of the impact of ASU 2014-09 on the timing of our revenue recognition but cannot currently provide a reasonably accurate estimate of its impact.