We periodically receive offers from third parties to purchase or obtain licenses for patents and other intellectual property rights in exchange for royalties or other payments. We also periodically receive notices, or are named in lawsuits, alleging that our products or services infringe on patents or other intellectual property rights of third parties.parties, or receive requests to indemnify customers who allege that their use of our products or services caused them to be named in an infringement proceeding. In certain instances, these matters can potentially adversely impact our operations, operating results or financial position. For additional information, see “Risk Factors—Risks Affecting Our Business” in Item 1A of Part I of this annual report, and Note 16—19—Commitments, Contingencies and ContingenciesOther Items to our consolidated financial statements in Item 8 of Part II of this annual report.

Our domestic operations are subject to significant local, state, federal and foreign laws and regulations.

In February 2015, the FCC adopted new regulations that regulatean order classifying Broadband Internet services as a public utilityAccess Services ("BIAS") under Title II of the Communications Act of 1934.1934 and applying new regulations. In 2016, that order was upheld by a courtDecember 2017, the FCC voted to repeal most of appeals. We anticipate that thesethose regulations and any related rules may be reviewed by Congress.the classification of BIAS as a Title II service and to preempt states from imposing substantial regulations on broadband. Opponents of this change appealed this action in federal court and have advocated in favor of re-instituting regulation of Internet services under Title II of the Communications Act. Several states have also opposed the change and have initiated state executive orders or introduced legislation focused on state-specific Internet service regulation. In addition,October 2019, the newly-constituted FCC may reconsider these regulations. At this time, we cannot estimatefederal court upheld the impact this may have on our business.

We operate in states where traditional cost recovery mechanisms, including rate structures,state USF, are under evaluation or have been modified. The 2017 changes to the federal tax code prompted several states to review the potential impact to regulated rates. As laws and regulations change, there can be no assurance that these mechanisms will continue to provide us with anythe same level of cost recovery.

Our subsidiaries operating outside of our states. The outcomes of these disputes cannot be determined at this time. If we are required to reduce our intrastate switched access rates as a result of any of these disputes or state initiatives, we will seek to recover displaced switched access revenues from state universal service funds or other services. However, the amount of such recovery, particularly from residential customers, is not assured.

With respect to providing our strategic services to residential customers, competition is based on price, bandwidth, qualitytechnology advancements have increased both the quantity and speedtype of service, promotionscompetitors that we compete with for our services. More specifically, voice services face significant product and bundled offerings. Wirelesstechnology substitution. Additionally, cable companies have increased broadband speeds and continue to compete with our broadband services, and wireless carriers' latest generation technologies are allowing them to more directly compete with our strategicBroadband services. The mannerfragmentation of the video market with the proliferation of Over the Top providers has made it difficult for us to offer a cost-effective video product. Lastly, the regulatory environment in which we operate, while it provides us certain advantages, can make us less nimble than cable, wireless, and other technology companies.

The following discussion identifies the most significant risks or uncertainties that could (i) materially and adversely affect our business, financial condition, results of operations, liquidity or prospects or (ii) cause our actual results to differ materially from our anticipated results or other expectations. The following information should be read in conjunction with the other portions of this annual report, including “Special Note Regarding Forward-Looking Statements”, “Management’s Discussion and Analysis of Financial Condition and Results of Operations” in Item 7 of Part II and our consolidated financial statements and related notes in Item 8 of Part II.8. Please note that the following discussion is not intended to comprehensively list all risks or uncertainties faced by us. Our operations or actual results could also be similarly impacted by additional risks and uncertainties that are not currently known to us, that we currently deem to be immaterial, that arise in the future or that are not specific to us, such as general economic conditions. In addition, certain of the risks described below apply only to a part or segment of our business.

Each of our offerings to our residentialbusiness and businessconsumer customers face increasingly intense competition from a wide variety of sources under evolving market conditions. We expect these trends will continue. In addition toparticular, (i) aggressive competition from larger national telecommunications providers, we are facing increasing competition from several other sources, including cablea wide range of communications and satellite companies, wireless providers, technology companies cloud companies, broadband providers, device providers, resellers, sales agents and facilities-based providers using their own networks as well as those leasing partshas limited the prospects for several of our network. In particular, (i)offerings to business customers, (ii) intense competition from wireless and other communications providers has led to a long-term systemic decline in the number of our wireline voice customers (ii)and (iii) strong competition from cable companies and others has impacted the growthour operations. We also face competition from cloud companies, broadband providers, software developers, device providers, resellers, sales agents and facilities-based providers using their own networks as well as those leasing parts of our broadband operations and (iii) aggressive competition from a wide range of technology companies and other market entrants has limited the prospects for our cloud computing operations.network. We expect these trends will continue. For more detailed information, see "Business—Competition" in Item 1 of Part I of this annual report.

Some of our current and potential competitors (i) offer products or services that are substitutes for our legacytraditional wireline voice services, including wireless voice and non-voice communication services, (ii) offer a more comprehensive range of communications products and services, (iii) offer products or services with features that we cannot readily match in some or all of our markets, (iv) offer shorter installation intervals, allowing customers to begin receivinginstall their services sooner after ordering,more quickly than we do, (v) have greater marketing, engineering, research, development, technical, provisioning, customer relations, financial andor other resources, (vi) have larger or more diverse networks with greater transmission capacity, (vii) conduct operations or raise capital at a lower cost than us, (viii) are subject to less regulation, which we believe enables such competitors to operate more flexibly than us with respect to certain offerings, (ix) offer services nationally or internationally to a larger geographic area or larger base of customers, (x) have substantially stronger brand names, which may provide them with greater pricing power than ours, (xi) have deeper or (xi)more long-standing relationships with key customers, or (xii) have larger operations than ours, which may enable them to compete more successfully in recruiting top talent, entering into operational or strategic partnerships or acquiring companies. Consequently, these competitors may be better equipped to provide more attractive offerings, to charge lower prices for their products and services, to develop and expand their communications and network infrastructure more quickly, to adapt more swiftly to changes in technologies or customer requirements, to devote greater resources to the marketing and sale of their products and services, to provide more comprehensive customer service, to provide greater resources to research and development initiatives and to take advantage of business or other opportunities more readily. In the past, several of our competitors and their operations have grown through acquisitions and aggressive product development. The continued growth of our competitors could further enhance their competitive positions.

Competition could adversely impact us in several ways, including (i) the loss of customers, and market share (ii) the possibility of customers terminating or reducing their usage of our services or shifting to less profitable services, (iii) reduced traffic on our networks, (iv)(ii) our need to expend substantial time or money on new capital improvement projects, (v)(iii) our need to lower prices or increase marketing expenses to remain competitive and (vi)(iv) our inability to diversify by successfully offering new products or services.

We are continually taking steps to respond to these competitive pressures, but these efforts may not be successful. Our operating results and financial condition would be adversely affected if these initiatives are unsuccessful or insufficient. If this occurred, our ability to pay our debt and other obligations and to re-invest in the business would also be adversely affected.

The communications industry has been and continues to be impacted by significant technological changes, which in general are enhancing wireless services and enabling a much broader array of companies to compete with us. Many of these technological changes are (i) enabling customers to reduce or bypass use of our networks, (ii) displacing or reducing demand for our services, or (iii) enabling the development of competitive products or services. For years, improvements inthe development of wireless and Internet-based voice and non-voice communications technologies and social media platforms have significantly reduced demand for our legacytraditional voice services, and these trends continue. More recently, continuous improvements in wireless data technologies have enabled wireless carriers to offer competing data transmission products that are highly convenient to use, and we expect this trend to continue as technological advances enable these carriers to carry greater amounts of data faster and with less latency. Technological advancements have also permitted cable companies and other of our competitors to deliver generally faster average broadband transmission speeds than ours. Developments in software have permitted new competitors to offer affordable networking products that historically required more expensive hardware investment. Rapid changes in technology have also placed competitive pressures on our video, cloud and hosting businesses, and enabled new competitors to enter our markets. To enhance the competitiveness of certain of our services, we will likely be required to spend additional capital to install more fiber optic cable or to augment the capabilities of our copper-based services.

We may not be able to accurately predict or respond to changes in technology or industry standards, or to the introduction of newly-offered services. Any of these developments could make some or all of our offerings less desirable or even obsolete, which would place downward pressure on our market share and revenues.revenue. These developments could also require us to (i) expend capital or other resources in excess of currently contemplated levels to enhance our network or develop products or services, (ii) forego the development or provision of products or services that others can provide more efficiently, or (iii) make other changes to our operating plans, corporate strategies or capital allocation plans, any of which could be contrary to the expectations of our security holders or could adversely impact our operations. Our inability to effectively respond to technological changes could adversely affect ourbusiness operating results and financial condition, as well as our ability to service debt and fund other commitments or initiatives.results.

In addition to introducing new technologies and offerings, we may need, from time to time, to phase out outdated and unprofitable technologies and services. If we are unable to do so on a cost-effective basis, we could experience reduced profits. Similarly, if new market entrants are not burdened by an installed base of outdated equipment or obsolete technology, they may have a competitive advantage over us.

In order to compete effectively and respond to the changing communication needs ofmarket conditions, we must continuously offer products and services on terms and conditions that allow us to retain and attract customers and to meet their evolving needs. To do so, we must continuously (i) invest in our customers, we continuouslynetwork (ii) develop, test and introduce new products and services and (iii) rationalize and simplify our offerings by eliminating older or overlapping products or services. Our ability to maintain attractive products and services and to successfully introduce new product or service offerings on a timely and cost-effective basis could be constrained by a range of factors, including network limitations, support system limitations, limited capital, an inability to attract key personnel with the necessary skills, intellectual property constraints, testing delays,inadequate digitization or automation, technological limits or an inability to act as quickly or efficiently as other competitors. Network service enhancements and product launches could take longer or cost more money than expected due to a range of factors, including software issues, supplier delays, testing delays, permitting delays, or network incompatibility issues. In addition, new product or service offerings may not be widely accepted by our customers. Our business could be materially adversely affected if we are unable to maintain competitive products and services and to timely and successfully develop and introduce new products or services.

Primarily as a result of the competitive and technological changes discussed above, we can effectively compete only ifhave experienced a prolonged systemic decline in our local voice, long-distance voice, network access and private line revenue. Consequently, we can quicklyhave experienced declining consolidated revenue (excluding acquisitions) for a prolonged period. More recently, we have experienced declines in revenue derived from the sale of a broader array of our products and efficiently (i) quoteservices.

We have taken a variety of steps to counter these declines in revenue, including an increased focus on selling services in greater demand. However, for the reasons described elsewhere in this report, we have thus far been unable to reverse our annual revenue losses (excluding acquisitions). In addition, most of our more recent product and accept customer orders, (ii) provision and initiate ordered services, (iii) provide customers with adequate means to manage theirservice offerings generate lower profit margins than our traditional services, and (iv) accurately bill forsome can be expected to experience slowing or no growth in the future. Accordingly, you should not assume that we will be successful in attaining our services. Developmentgoal of systems designed to support these tasks is a significant undertaking that continuously requires our personnel and third-party vendors to adjust to changes in our offerings and customers' preferences, to eliminate inconsistencies between the practices of our legacy operations and newly-acquired operations, to eliminate older support systems that are costly or obsolete, to develop uniform practices and procedures, and to automate them as much as possible. Our failure to continuously develop service support systems that are satisfactory to our current and potential customers could adversely impact our competitive position.achieving future revenue growth.

Ongoing changes in the communications industry have fundamentally changed consumers’ communications expectations and requirements. In response to these changes, we have substantially altered our product and service offerings through acquisitions and internal product development. Many of these changes have placed a higher premium on sales, marketing and product development functions, and necessitated ongoing changes in our processes and operating protocols, as well as periodic reorganizations of our sales and leadership teams. In addition, we now offer a much more complex range of products and services, operate larger and more complex networks and serve a much larger and more diverse set of global customers. Consequently, we now face greater challenges in effectively managing and administering our operations and allocating capital and other resources to our various offerings. For all these reasons, we cannot assure you that our efforts to adjust to these changes will be timely or successful.

As noted in greater detail elsewhere herein, our business is capital intensive, including our need to continually invest to update, consolidate and improve our network, our product offerings and our customer support systems. We expect our business to continue to be capital intensive for the foreseeable future. We will also continue to need substantial amounts of cash to meet our fixed commitments and other business objectives, including without limitation funding our operating costs, maintenance expenses, debt repayments, tax obligations, periodic pension contributions and other benefits payments. We further expect to continue to require significant cash to fund our quarterly dividend payments, subject to the discretionary right of our Board of Directors to change or terminate our current objectives.dividend practices at any time. We rely upon our consolidated revenue and cash flows from operating activities to fund our cash needs.

As noted in the risk factor disclosures appearing above and below, changes in competition, technology, regulation and demand for our legacytraditional wireline services continue to place downward pressure on our consolidated revenues and cash flows. During each of 2016, 2015, 2014 and 2013, we experienced declines in revenues and net cash provided by operating activities as compared to prior periods. Our cash flows will be further impacted by other changes discussed herein, including anticipated increases in our cash tax payments prior to the pending Level 3 acquisition and additional post-retirement health care payments as a result of the depletion in 2016 of substantially all of the post-retirement benefit plan trust assets.

For these reasons, we cannot assure you that our future cash flows from operating activities will be sufficient to fund all of our cash requirements in the manner currently contemplated. Our inability to fund certain of these payments could have an adverse impact on our business, operations, ornetwork reliability, competitive position, prospects or on the value of our securities.

We are materially reliant upon our networks, information technology infrastructure and related technology systems (including our billing and provisioning systems) to provide products and services to our customers and to manage our operations and affairs. We face the risk, as does any company, of a security breach or significant disruption of our information technology infrastructure and related systems. As a communications company that transmits large amounts of information over communications networks, we face an added risk that a security breach or other significant disruption of our public networksnetwork, infrastructure or information technology infrastructure and related systems, or those that we develop, install, operate andor maintain for certain of our business customers, (which includes our wholesale and governmental customers) could lead to material interruptions or curtailments of service. Moreover, in connection with processing and storing sensitive and confidential customer data, we face a heightened risk that a security breach or disruption could result in unauthorized access to our customers’ proprietary information oninformation.

To safeguard our public networks or internal systems or the systems thatand data stored thereon, we operate and maintain for certain of our customers.

Similar to other large telecommunicationscommunications companies, we are a constant target of cyber-attacks of varying degrees. Although some of these attacks have resulted in security breaches, to date,thus far none of these breaches have resulted in a material adverse effect on our operating results or financial condition. You should be aware, however, that the risk of breaches is likely to increase due to several factors, including the increasing sophistication of cyber-attacks and the wider accessibility of cyber-attack tools. You should be further aware that defenses against cyber-attacks currently available to U.S. companies are unlikely to prevent intrusions by a highly-determined, highly-sophisticated hacker. Consequently, you should assume that we will be unable to implement security barriers or other preventative measures that repel all future cyber-attacks. Any such future security breaches or disruptions could materially adversely affect our business, results of operations or financial condition, especially in light of the growing frequency, scope and well-documented sophistication of cyber-attacks and intrusions.

Although we maintain insurance coverage that may, subject to policy terms and conditions (including self-insured deductibles, coverage restrictions and monetary coverage caps), cover certain aspects of our cyber risks, such insurance coverage may be unavailable or insufficient to cover our losses.

Additional risks to our network, infrastructure and related systems include:include, among others:

Due to these factors, from time to time in the ordinary course of our business we experience disruptions in our service, andservice. We could experience more significant disruptions in the future.future, especially if network traffic continues to increase and we continue to assume greater responsibility for managing our customers' critical systems and networks.

Disruptions, security breaches and other significant failures of the above-described networks and systems could:

Any or all of the foregoing developments could have a negative impact on our business, results of operations, financial condition and cash flows.

We believe our industry is by its nature more prone to reputational risks than many other industries. Our ability to attract and retain customers depends substantially upon external perceptions of our products, services, management integrity and financial performance. Customer complaints, governmental investigations, outages, or other service failures of networks operated by us or other operators could cause substantial adverse publicity affecting us. Similar events impacting other operators could indirectly harm us specifically orby causing substantial adverse publicity affecting our industry generally.in general. In either case, press coverage, social media coverage andmessaging or other public statements that insinuate improper actions by us or other operators, regardless of their factual accuracy or truthfulness, may result in negative publicity, litigation, governmental investigations or additional regulations. Addressing negative publicity and any resulting litigation or investigations may distract management, increase costs and divert resources. Negative publicity may have an adverse impact on our reputation and the morale of our employees, whichemployees. We could suffer similar adverse effects if shareholders, financial analysts or other financial professionals issue public statements that cast us or our industry in a negative light. Any of these developments could adversely affect our business, results of operations, financial condition, cash flows, prospects and cash flows.the value of our securities.

Over the past several years, a range of competitive and technological factors, including robust network construction and intense competition, have lowered market prices for many of our products and services. If these market conditions persist, we may need to continue to reduce prices to retain customers and revenue. If future price reductions are necessary, weour operating results will suffer unless we are able to offset these reductions by reducing our operating expenses or increasing our sales volumes.

Our future growth potential will depend in part upon the continued development and expansion of the Internet as a communication medium and marketplace for the distribution of data, video, voice and other products by businesses, consumers, and governments. The use of the Internet for these purposes may not grow and expand at the rate anticipated by us or others, or may be restricted by factors outside of our control, including (i) actions by other carriers or governmental authorities that restrict us from delivering traffic over other parties' networks, (ii) changes in regulations, (iii) technological stagnation, (iv) increased concerns regarding cyber threats or (iv)(v) changes in consumers' preferences or data usage.

Video streaming services, gaming and peer-to-peer file sharing applications use significantly more bandwidth than other Internet activity such as web browsing and email. As use of these newer services continues to grow, our broadband customers will likely use much more bandwidth than in the past. If this occurs, we could be required to make significant budgeted or unbudgeted capital expenditures to increase network capacity in order to avoid service disruptions, service degradation or slower transmission speeds for our customers. Alternatively, we could choose to implement network management practices to reduce the network capacity available to bandwidth-intensive activities during certain times in market areas experiencing congestion, which could negatively affect our ability to retain and attract customers in affected markets. While we believe demand for these services may drive broadband customers to pay for faster broadband speeds, competitiveCompetitive or regulatory constraints may preclude us from recovering the costs of the necessary network investments. Thisinvestments designed to address these issues, which could result in an adverseadversely impact to our operating margins, results of operations, financial condition and cash flows.

Like other communications companies, we have increasingly in recent years received a number of notices from third parties or have been named in lawsuits filed by third parties claiming we have infringed or are infringing upon their intellectual property rights. We are currently responding to several of these notices and claims and expect this industry-wide trend will continue. Responding to these claims may require us to expend significant time and money defending our use of the applicable technology, and divert management’s time and resources away from other business. In certain instances, we may be required to enter into licensing agreements requiring royalty payments. In the case of litigation, we could be required to pay significant monetary damages or cease using the applicable technology. If we are required to take one or more of these actions, our profit margins may decline or our operations could be materially impaired. In addition, in responding to these claims, we may be required to stop selling or redesign one or more of our products or services, which could significantly and adversely affect our business, results of operations, financial condition and cash flows.

Similarly, from time to time, we may need to obtain the right to use certain patents or other intellectual property from third parties to be able to offer new products and services. If we cannot license or otherwise obtain rights to use any required technology from a third party on reasonable terms, our ability to offer new products and services may be prohibited, restricted, made more costly or delayed.

We rely on various patents, copyrights, trade names, trademarks, service marks, trade secrets and other similar intellectual property rights, as well as confidentiality proceduresagreements and contractual restrictions,procedures, to establish and protect our proprietary rights. TheThese steps, we have taken, however, may not prevent unauthorized use or the reverse engineering of our technology.fully protect us. Others may independently develop technologies that are substantially equivalent, superior to, or otherwise competitive to the technologies we employ in our services, or thatmay intentionally or unintentionally infringe on our intellectual property. WeMoreover, we may be unable to prevent competitors from acquiring proprietary rights that are similar to or infringe upon our proprietary rights, or to prevent our current or former employees from using or disclosing to others our proprietary information. Enforcement of our intellectual property rights may depend on initiating legal actions against parties who infringe or misappropriate our proprietary information, but these actions may not be successful, even when our rights have been infringed. If we are unsuccessful in protecting or enforcing our intellectual property rights, our business, competitive position, results of operations and financial condition could be adversely affected.

Conversely, certain of our operations carry a significant amount of voice or data traffic for other communications providers. Their reliance on our services exposes us to the risk that they may transfer all or a portion of this traffic from our network to existing or newly built networks, built, owned or leased by them, thereby reducing our revenues.revenue. For additional information, see “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Segment Results”Business Trends” included in Item 7 of Part II of this annual report.

We also rely on reseller and sales agency arrangements with other communications companies to provide some of the services that we offer to our customers, including video services and wireless products and services. As a reseller or sales agent, we do not control the availability, retail price, design, function, quality, reliability, customer service, marketing or branding of these products and services, nor do we directly control all of the marketing and promotion of these products and services. Similar to the risks described above regarding our reliance upon other carriers, we could be adversely affected if these communication companies fail to maintain competitive products or services, or fail to continue to make them available to us on attractive terms, or at all.

Our operations and financial performance could be adversely affected if our relationships with any of these other communications companies are disrupted or terminated for any other reason, including if such other companies:

As of December 31, 2016,2019, approximately 38%25% of our employees were members of various bargaining units represented by the Communications Workers of America or the International Brotherhood of Electrical Workers. From time to time, our labor agreements with unions expire. Approximately 11,000, or 28%, of our employees are subject to collective bargaining agreements that are scheduled to expire October 7, 2017. Although we typically are able to negotiate new bargaining agreements, we cannot predict the outcome of our future negotiations of these agreements. We may be unable to reach new agreements, and union employees may engage in strikes, work slowdowns or other labor actions, which could materially disrupt our ability to provide services and result in increased cost to us. In addition, newOur mixed workforce of represented and non-represented personnel could induce additional organizational activities. New or replacement labor agreements may impose significant new costs on us, which could impair our financial condition or results of operations in the future. To the extent they contain benefit provisions, these agreements may also limit our flexibility to change benefits in response to industry or competitive changes.benefits. In particular, post-employmentretirement benefits provided under these agreements could cause us to incur costs not faced by many of our competitors, which could ultimately hinder our competitive position.

We rely on rights-of-way, colocation agreements, franchises and other authorizations granted by governmental bodies, railway companies, utilities, carriers and other third parties to locate our cable, conduit and other network equipment on or under their respective properties. A significant number of these authorizations are scheduled to lapse over the next five to ten years, unless we are able to extend or renew them. Our operations could be adversely affected if any of these authorizations terminate or lapse, or if the landowner requests price increases. Moreover, our ability to expand our network could depend in part on obtaining additional authorizations, the receipt of which is not assured.

Over the past few years, certain utilities, cooperatives and municipalities in certain of the states in which we operate have requested significant rate increases for attaching our plant to their facilities. To the extent that these entities are successful in increasing the amount we pay for these attachments, our future operating costs will increase.

Our business customers maysubsidiaries currently are, and in the past have been, subject to lawsuits challenging the subsidiaries’ use of rights-of-way. Similar suits are possible in the future. Plaintiffs in these suits typically seek to shift riskhave them certified as class action suits. These suits are typically complex, lengthy and costly to us.defend, and expose us to each of the other general litigation risks described elsewhere herein.

We furnish to and receive from our business customers indemnities relating to damages caused or sustained by us in connection with certain of our operations. Our customers’ changing views on risk allocation could cause us to accept greater risk to win new business or could result in us losing business if we are not prepared to take such risks. To the extent that we accept such additional risk, and seek to insure against it, our insurance premiums could rise.

Our international operations are subject to U.S. and othernon-U.S. laws and regulations regarding operations in foreigninternational jurisdictions in which we provide services. These numerous and sometimes conflicting laws and regulations include anti-corruption laws, anti-competition laws, trade restrictions, tax laws, immigration laws, privacy laws and accounting requirements. Many of these laws are complex and change frequently. Regulations that require the awarding of contracts to local contractors or the employment of local citizens may adversely affect our flexibility or competitiveness in these jurisdictions. Local laws and regulations, and their interpretation and enforcement, differ significantly among those jurisdictions. There is a risk that these laws or regulations may materially restrict our ability to deliver services in various foreigninternational jurisdictions or could be breached through inadvertence or mistake, fraudulent or negligent behavior of our employees or agents, failure to comply with certain formal documentation or technical requirements, or otherwise. Violations of these laws and regulations could result in fines and penalties, criminal sanctions against us or our personnel, or prohibitions on the conduct of our business or our ability to operate in one or more countries, any of which could have a material adverse effect on our business, reputation, results of operations, financial condition or prospects.

Many foreignnon-U.S. laws and regulations relating to communications services are more restrictive than U.S. laws and regulations, particularly those relating to privacy rights and data retention. For example, all 28 member states of the European Union have adopted new European data protection laws that we believe could impact our operations in Europe and could potentially expose us to an increased risk of litigation or significant regulatory fines. Moreover, national regulatory frameworks that are consistent with the policies and requirements of the World Trade Organizationglobal organizations and standards have only recently been, or are still being, enacted in many countries. Accordingly, many countries are still in the early stages of providing for and adapting to a liberalized telecommunications market. As a result, in these markets we may encounter more protracted and difficult procedures to obtain licenses necessary to provide the full set of products and services we seek to offer.

In addition to these international regulatory risks, some of the other risks inherent in conducting business internationally include:

Many of these risks are beyond our control, and we cannot predict the nature or the likelihood of the occurrence or corresponding effect of any such events, each of which could have an adverse effect on our financial condition and results of operations.

We do business and may in the future do additional business in certain countries or regions in which corruption is a serious problem. Moreover, in order to effectively compete in certain foreignnon-U.S. jurisdictions, it is frequently necessary or required to establish joint ventures, strategic alliances or marketing arrangements with local operators, partners or agents. In certain instances, these local operators, partners or agents may have interests that are not always aligned with ours. Reliance on local operators, partners or agents could expose us to the risk of being unable to control the scope or quality of our overseas services or products, or being held liable under the FCPA or other anti-corruption lawsany Anti-Corruption Laws for actions taken by our strategic or local partners or agents even though these partners or agents may not themselves be subject to the FCPA or other applicable anti-corruption laws.agents. Any determination that we have violated the FCPA or other anti-corruption lawsany Anti-Corruption Laws could have a material adverse effect on our business, results of operations, reputation or prospects.

Historically, much of our growth has been attributable to acquisitions. Our future ability to grow through additional acquisitions could be limited by several factors, including our leverage, debt covenants and inability to identify attractively-priced target companies. Moreover, we generally must devote significant management attention and resources to evaluate acquisition opportunities, which could preclude us from evaluating acquisition opportunities during periods when management is committed to other opportunities, tasks or activities. Accordingly, we cannot assure you that we will be able to attain future growth through acquisitions. See "Risks Relating to Our Pending Acquisition of Level 3" for a discussion of certain specific risks raised by our pending acquisition of Level 3 and see the next risk factor immediately below for a discussion of certain general risks raised by acquisitions.

In an effort to implement our business strategies, we may from time to time in the future pursue other acquisition or expansion opportunities, including strategic investments. These transactions could involve acquisitions of entire businesses or investments in start-up or established companies, and could take several forms, including mergers, joint ventures, investments in new lines of business, or the purchase of equity interests or assets. These types of transactions may present significant risks and uncertainties, including the difficulty of identifying appropriate companies to acquire or invest in on acceptable terms, potential violations of covenants in our debt instruments, distraction of management from current operations, insufficient revenue acquired to offset liabilities assumed, unexpected expenses, inadequate return of capital, regulatory or compliance issues, potential infringements potential violations of covenants in our debt instruments and other unidentified issues not discovered in due diligence. To the extent we acquire part or all of a business that is financially unstable or is otherwise subject to a high level of risk, we may be affected by currently unascertainable risks of that business. Accordingly, there is no current basis for you to evaluate the possible merits or risks of the particular business or assets that we may acquire. Moreover, we cannot guarantee that any such transaction will ultimately result in the realization of the benefits of the transaction originally anticipated by us or that any such transaction will not have a material adverse impact on our financial condition or results of operations. In particular, we can provide no assurances that we will be able to successfully integrate the technology systems, billing systems, accounting processes, sales force,workforce, cost structure, product development and service delivery processes, standards, controls, policies, strategies and culture of the acquired company with ours. In addition, the financing of any future acquisition completed by us could adversely impact our capital structure as any such financing would likely include the issuance of additional securities or the borrowing of additional funds.

Unfavorable general economic conditions, including unstable economic and credit markets, or depressed economic activity caused by trade wars, epidemics, pandemics or other factors, could negatively affect our business. Worldwide economic growth has been sluggish since 2008, and many experts believe that a confluence of global factors may result in a prolonged period of economic stagnation, slow growth or economic uncertainty. While it is difficult to predict the ultimate impact of these general economic conditions, they could adversely affect demand for some of our products and services and could cause customers to shift to lower priced products and services or to delay or forego purchases of our products and services. These conditions impact, in particular, our ability to sell discretionary products or services to business customers that are under pressure to reduce costs or to governmental customers that have suffered substantial budget cuts in recent years.operating under budgetary constraints. Any one or more of these circumstances could continue to depress our revenues.revenue. Also, our customers may encounter financial hardships or may not be able to obtain adequate access to credit, which could negatively impact their ability to make timely payments to us. In addition, as discussed further below, unstable economic and credit markets may preclude us from refinancing maturing debt at terms that are as favorable as those from which we previously benefited, at terms that are acceptable to us, or at all. For these reasons, among others, if currentweak economic conditions persist or decline,could adversely affect our operating results, financial condition, and liquidity could be adversely affected.liquidity.

In addition, regulatory entities may impose certain requirements or obligationslate 2017, this transaction combined two companies which previously operated as conditions for their approval or in connection with their review. The merger agreement may require CenturyLink or Level 3 to accept conditions from these regulators that could adversely affect the combined company without either of CenturyLink or Level 3 having the right to refuse to close the acquisition on the basis of those regulatory conditions. Whileindependent public companies. Although, we are not required to accept conditions that would or would reasonably be likely to have a material adverse effect on the combined company (assuming for these purposes that the combined company is the size of CenturyLink), this assessment will be made at or prior to the closing and we cannot provide any assurance that any required conditions will not have a material adverse effect on the combined company following the proposed acquisition. In addition, we cannot provide any assurance that these conditions will not result in the abandonment of the acquisition.

Our failure to adequately address these and related transactions;

RegulationDomestic regulation of the telecommunications industry continues to change, and the regulatory environment varies substantially from jurisdiction to jurisdiction. A substantial portion of our local voice services revenue remains subject to FCC and state utility commission pricing regulation, which periodically exposes us to pricing or earnings disputes and could expose us to unanticipated price declines. In addition, from time to time carriers or other third parties refuse to pay for certain of our services or challenge our rights to receive certain service payments, file complaints requesting rate reductions or take other similar actions that have the potential to reduce our revenues.payments. Our future revenues,revenue, costs, and capital investment could be adversely affected by material changes to or decisions regarding the applicability of government requirements, including, but not limited to, changes in rules governing intercarrier compensation, state and federal USF support, competition policies, pricing limitations or operational restrictions. There can be no assurancewe cannot assure you that future regulatory, judicial or legislative activities will not have a material adverse effect on our operations, or that regulators or third parties will not raise material issues with regard to our compliance or noncompliance with applicable regulations.operations.

Changes in the composition and leadership of the FCC, state commissions and other agencies that regulate our business could have significant impacts on our revenues,revenue, expenses, competitive position and prospects. Changes in the composition and leadership of these agencies are often difficult to predict, and makewhich makes future planning more difficult.

Many of the FCC’s regulations adopted in recent years remain subject to judicial review and additional rulemakings, thus increasing the difficulty of determining the ultimate impact of these changes on us and our competitors.

Federal and state agencies that coulddispense support program payments can, and from time to time do, reduce the amount of their universal service supportthose payments to incumbent local exchange companies. If these trends continue, we would suffer a reductionus and other carriers.

For more information, see "Business—Regulation" in our revenues from state support programs.Item 1 of this report, and "Management's Discussion and Analysis of Financial Condition and Results of Operations" in Item 7 of this report.

Our business also may be impacted by legislation and regulation imposing new or greater obligations related to regulations or laws related to regulating broadband services, storing records, fighting crime, bolstering homeland security or cyber security, increasing disaster recovery requirements, minimizing environmental impacts, enhancing privacy, restricting data collection, protecting intellectual property rights of third parties, or addressing other issues

Our participation in the FCC's CAF Phase 2II support program subjects us to certain financial risks. If we fail to attain certain specified infrastructure buildout requirements, the FCC could withhold future CAF support payments until these shortcomings are rectified. In addition, if we are not in compliance with FCC measures by the end of the CAF Phase 2II program, we would incur substantial penalties. To comply with the FCC's buildout requirements, we believe we will need to continue to dedicate a substantial portion of our future capital expenditure budget through the end of the program to the construction of new infrastructure. The CAF-related expenditures could reduce the amount of funds we are willing or able to allocate to other initiatives or projects. The FCC has determined it will use reverse auctions to award support under a new fund following the completion of CAF Phase II. We cannot assure you that any funding that we pursue and receive through these upcoming auctions will be sufficient to replace our current CAF Phase II payments.

Since the creation of the Internet, there has been extensive debate about whether and how to operate our broadband business profitablyregulate Internet service providers. A significant number of U.S. congressional leaders, state elected officials and to manage our broadband facilities efficiently.

The liability of private network operators for information stored or transmitted on their networks is impacted both by changing technology and evolving legal principles that remain unsettled in many jurisdictions. AsWhile we disclaim any liability for third-party content in our service contracts, as a private network provider we potentially could be exposed to legal claims relating to third party content stored or transmitted on our networks. Such claims could involve, among others, allegations of defamation, invasion of privacy, copyright infringement, or aiding and abetting restricted activities such as online gambling or pornography. Although we believe our liability for these types of claims is limited, suits against other carriers have been successful and we cannot assure you that our defenses will prevail. If we decide to implement additional measures to reduce our exposure to these risks, or if we are required to defend ourselves against these kinds of claims, our operations and financial results could be negatively affected.

There are several material proceedings pending against us, as described in Note 16—19—Commitments, Contingencies and ContingenciesOther Items to our consolidated financial statements included in Item 8 of Part II of this annual report. Results of these legal proceedings cannot be predicted with certainty. Irrespective of its merits, litigation may be both lengthy and disruptive to our operations and could cause significant expenditure and diversion of management attention. AnyWe review our litigation accrual liabilities on a quarterly basis, but in accordance with applicable accounting guidelines only establish accrual liabilities when losses are deemed probable and reasonably estimable and only revise previously-established accrual liabilities when warranted by changes in circumstances, in each case based on then-available information. As such, as of any given date we could have exposure to losses under proceedings as to which no liability has been accrued or as to which the accrued liability is inadequate. For each of these reasons, any of the proceedings described in Note 16,19—Commitments, Contingencies and Other Items, as well as current litigation not described therein or future litigation, could have a material adverse effect on our business, reputation, financial position, or operating results.results, the trading price of our securities and our ability to access the capital markets. We can give you no assurances as to the ultimate impact of these matters on our operating results or financial condition.us.

We may be required to obtain from municipal authorities operating franchises to install or expand certain facilities related to our fiber transport operations and certain of our competitive local exchange carrier operations, and our facilities-based videoother services. Some of these franchises may require us to pay franchise fees. Many of our franchise agreements have compliance obligationsfees, and failuremay require us to comply may result inpay fines or penalties.penalties if we violate or terminate our related contractual commitments. In some cases, certain franchise requirements could delay us in expanding our operations or increase the costs of providing these services.

Changing laws, regulations and standards relating to corporate governance and public disclosure, including the Sarbanes-Oxley Act and the Dodd-Frank Wall Street Reform and Consumer Protection Act, and related regulations implemented thereunder, have increased our legal and financial compliance costs and made some activities more time consuming. Any failure to successfully orcomply with these laws and regulations, including any failure to timely complete annual assessments of our internal controls, required by Section 404 of the Sarbanes-Oxley Act could subject us to sanctions or investigation by regulatory authorities. Any such action could adversely affect our financial results or our reputation with investors, lenders or others.

From time to time, the laws or regulations governing us or our customers, or the government’s policy of enforcing those laws or regulations, have changed frequently and materially. The variability of these laws could hamper the ability of us and our customers to plan for the future or establish long-term strategies. Moreover, future changes in these laws or regulations could further increase our operating or compliance costs, or further restrict our operational flexibility, any of which could have a material adverse effect on our results of operations, competitive position, financial condition or prospects.

For a more thorough discussion of the regulatory issues that may affect our business, see "Business—Regulation" in Item 1 of Part I of this annual report.

We continue to carry significant debt. As of December 31, 2016,2019, the aggregate principal amount of our consolidated long-term debt was $34.8 billion, excluding unamortized discounts, net, unamortized debt issuance costs and capitalfinance lease and other obligations, was $19.879 billion. Asobligations. Following the January 2020 refinancing of the dateour revolving credit facilities and term loan debt originally maturing in 2022, as discussed in Note 7—Long-Term Debt and Credit Facilities, we now have $7.0 billion of this annual report, $2.715 billion aggregate principal amount of this long-term debt is scheduled to maturebecome payable prior to December 31, 2019.2022. While we currently believe we will have the financial resources to meet or refinance our obligations when they come due, we cannot fully anticipate our future performance or financial condition, the future condition of the credit markets or the economy generally.

Our significant levels of debt can adversely affect us in several other respects, including:

The effects of each of these factors could be intensified if we increase our borrowings.

Any failure to make required debt payments could, among other things, adversely affect our ability to conduct operations or raise capital.

Subject to certain limitations and restrictions, the current terms of our debt instruments and the debt instruments of our subsidiaries permit us or them to incur additional indebtedness. Additional debt may be necessary for many reasons,indebtedness, including those discussed above.additional borrowings under our revolving credit facility. Incremental borrowings that impose additional financial risks could exacerbate the other risks described in this annual report.

We have a significant amount of indebtedness that we intend to refinance over the next several years, principally through the issuance of debt securities or term loans by CenturyLink or one or more of CenturyLink, Inc., Qwest Corporationour principal subsidiaries. We may also need to obtain additional financing under a variety of other circumstances, including if:

Our ability to arrange additional financing will depend on, among other factors, our financial position, performance, and credit ratings, as well as prevailing market conditions and other factors beyond our control. Global financial markets continue to be volatile. Prevailing market conditions could be adversely affected by (i) general market conditions, such as disruptions in domestic or overseas sovereign or corporate debt markets, geo-political instabilities, contractions or limited growth in the economy or other similar adverse economic developments in the U.S. or abroad and (ii) specific conditions in the communications industry. Instability in the domestic or global financial markets has from time to time resulted in periodic volatility and disruptions in capital markets. Uncertainty regarding worldwide trade, the strength of various global and supranatural governing bodies and other geopolitical events could significantly affect global financial markets in 2020. Volatility in the global markets could limit our access to the credit markets, leading to higher borrowing costs or, in some cases, the inability to obtain financing on terms that are as favorable as those from which we previously benefited, on terms that are acceptable to us, or at all. Any such failure to obtain additional financing could jeopardize

In addition, our ability to repay, refinance or reduceborrow funds in the future will depend in part on the satisfaction of the covenants in our credit facilities and other debt obligations.instruments, which are discussed further below.

Our access to obtain additional financingfunds under a varietyour revolving credit facility is further dependent upon the ability of the facility’s lenders to meet their funding commitments. Stricter capital-related and other circumstances, including if:

For all the reasons mentioned above, we can give no assurance that additional financing for any of these purposes will be available on terms that are acceptable to us, or at all.

If we are unable to satisfy the covenants contained in those instruments, or are unable to generate cash sufficient to make required debt payments or refinance our debt, we would likely have to consider other options, such as selling assets, issuing additional securities, reducing or terminating our dividend payments, cutting or delaying costs or otherwise reducing our cash requirements, or negotiating with our lenders to restructure our applicable debt. Our current and future debt instruments may restrict, or market or business conditions may limit, our ability to complete some of these actions on favorable terms, or at all. For these and other reasons, we cannot assure you that we could implement these steps in a sufficient or timely manner, or at all. Moreover, any steps taken to strengthen our liquidity, such as cutting costs, could adversely impact our business or operations.

CenturyLink, Inc. and various of its subsidiaries owe substantial sums pursuant to whom wevarious debt and financing arrangements, certain of which are indebtedguaranteed by other principal subsidiaries. Over half of the debt of CenturyLink, Inc. is guaranteed by nine of its principal domestic subsidiaries, six of which have pledged substantially all of their assets (including certain of their respective subsidiaries) to secure their guarantees. The remainder of the debt of CenturyLink, Inc. is neither secured by collateral nor guaranteed by any of its subsidiaries. Nearly half of the debt of Level 3 Financing, Inc. is (i) secured by a pledge of substantially all of its assets and (ii) guaranteed on a secured basis by certain of its affiliates. The remainder of the debt of Level 3 Financing, Inc. is not secured by any of its assets, but is guaranteed by its parent. Substantial amounts of debt are also owed by two direct or indirect subsidiaries of Qwest Communications International Inc. and by Embarq Corporation and one of its subsidiaries. Most of the approximately 400 subsidiaries of CenturyLink, Inc. have neither borrowed money nor guaranteed any of the debt of CenturyLink, Inc. or its affiliates. As such, investors in our consolidated debt instruments should be aware that (i) determining the priority of their rights as creditors is a complex matter which is substantially dependent upon the assets and earning power of the entities that issued or guaranteed (if any) the applicable debt and (ii) a substantial portion of such debt is structurally subordinated to all liabilities of the non-guarantor subsidiaries of CenturyLink, Inc. to the extent of the value of those subsidiaries that are obligors.

The failure of CenturyLink, Inc. or any of its subsidiaries to comply with the above-described restrictive or financial covenants could result in an event of default, which, if not cured or waived, could accelerate the maturity of some or all of our outstanding indebtedness.debt repayment obligations. Certain of our debt instruments have cross-default or cross-acceleration provisions. When present, these provisions could have a wider impact on liquidity than might otherwise arise from a default or acceleration of a single debt instrument.

Nationally recognized credit rating organizations have issued credit ratings relating to CenturyLink, Inc.'s long-term debt and the long-term debt of several of its subsidiaries. MostMany of these ratings are below “investment grade”, which results in higher borrowing costs than "investment grade" debt as well as reduced marketability of our debt securities. There can be no assurance that any rating assigned to any of these debt securities will remain in effect for any given period of time or that any such ratings will not be lowered, suspended or withdrawn entirely by a rating agency if, in that rating agency’s judgment, circumstances so warrant.

A downgrade of any of these credit ratings could:

Under our January 31, 2020 amended and restated credit agreement, a “change of control” of CenturyLink, Inc. constitutes an event of default. Moreover, if the credit ratings relating to certain of our currently outstanding long-term debt securities are downgraded in the manner specified thereunder in connection with a “change of control” of CenturyLink, Inc., then we will be required to offer to repurchase such debt securities. The long-term debt securities of several of our subsidiaries include similar covenants that could, under similar circumstances in connection with a “change of control” of one of the subsidiaries, require us to offer to repurchase such securities. If, due to lack of cash, legal or contractual impediments (including certain covenants in CenturyLink's credit agreement that restrict payments on outstanding indebtedness other than regularly scheduled payments), or otherwise, we fail to offer to repurchase such debt securities, such failure could constitute an event of default under such debt securities. Any default under our credit facility or these debt securities which could in turn constitute a default under other of our agreements relating to our indebtedness outstanding at that time. Moreover, the existence of these default or repurchase covenantsprovisions may in certain circumstances render it more difficult or discourage a sale or takeover of us, or the removal of our incumbent directors.

Our business is capital intensive, and we anticipate that our capital requirements will continue to be significant in the coming years.

We may be unable to expand or adapt our network infrastructure to respond to these developments in a timely manner, at a commercially reasonable cost or on terms producing satisfactory returns on our investment.

In addition to investing in expanded networks, new products or new technologies, we must from time to time invest capital to (i) replace some of our aging equipment that supports many of our legacytraditional services that are experiencing revenue declines or (ii) convert older systems to simplify and modernize our network. While we believe that our currently planned level of capital expenditures will meet both our maintenance and core growth requirements, this may not be the case if demands on our network continue to accelerate or other circumstances underlying our expectations change. Increased spending could, among other things, adversely affect our operating margins, cash flows, results of operations and financial position.

Similarly, we continue to anticipate incurring substantial operating expenses to support and maintain our incumbent services and growth initiatives. We may beoperations. If we are unable to sufficiently manageattain our objectives for managing or reducereducing these costs, even if revenues in some of our lines of business are decreasing. If so, our operating margins will be adversely impacted.

As a holding company, substantially all of our income and operating cash flow is dependent upon the earnings of our subsidiaries and their distribution of those earnings to us in the form of dividends, loans or other payments. As a result, we rely upon our subsidiaries to generate the funds necessarycash flows in amounts sufficient to meetfund our obligations, including the payment of amounts owed under our long-term debt. Our subsidiaries are separate and distinct legal entities and have no obligation to pay any amounts owed by us, or,except to the extent they have guaranteed such payments. Similarly, subject to limited exceptions for tax-sharing or cash management purposes, our subsidiaries have no obligation to make any funds available to us to repay our obligations, whether by dividends, loans or other payments. State law applicable to each of our subsidiaries restricts the amount of dividends that they may pay. Restrictions that have been or may be imposed by state regulators (eitherAs discussed in connection with obtaining necessary approvals for our acquisitions or in connection with our regulated operations), andgreater detail elsewhere herein, restrictions imposed by credit instruments or other agreements applicable to Level 3 and certain of our other subsidiaries may limit the amount of funds that our subsidiaries are permitted to transfer to us, including the amount of dividends that may be paid to us. Moreover, our rights to receive assets of any subsidiary upon its liquidation or reorganization will be effectively subordinated to the claims of creditors of that subsidiary, including trade creditors. In addition, the laws under which our subsidiaries were organized typically restrict the amount of dividends that they may pay. The ability of our subsidiaries to transfer funds could be further restricted under applicable tax laws or orders imposed by state regulators (either in connection with obtaining necessary approvals for our acquisitions or in connection with our regulated operations). For all these reasons, you should not assume that our subsidiaries will be able in the future to generate and distribute to us cash in amounts sufficient to fund our cash requirements. See “Management’s Discussion and Analysis of Financial Condition and Results of Operations—LiquidityOperations —Liquidity and Capital Resources” included elsewhere in this annual report for further discussion of these matters.

For the reasons noted below, we cannot assure you that we will continue periodic dividends on our capital stock at the current rates, or at all. From time to time, our board has reduced our dividend rate, including reductions in early 2019 and early 2013.

As noted in the immediately preceding risk factor, because we are a holding company with no material assets other than the stock of our subsidiaries, our ability to pay dividends will depend on theour subsidiaries generating a sufficient amount of earnings and cash flow of our subsidiaries and their ability to furnish funds to us in the form of dividends, loans or other payments.

Any quarterly dividends on our common stock and our outstanding shares of preferred stock will be paid from funds legally available for such purpose when, as and if declared by our Board of Directors. Decisions on whether, when and in which amounts to continue making any future dividend distributions will remain at all times entirely at the discretion of our Board of Directors, which reserves the right to change or terminate our dividend practices at any time and for any reason without prior notice, including without limitation any of the following:

Based on its evaluation of these and other relevant factors, our Board of Directors may, in its sole discretion, decide not to declare a dividend on our common stock or our outstanding shares of preferred stock for any period for any reason without prior notice, regardless of whether we have funds legally available for such purposes. Holders of our equity securities should be aware that they have no contractual or other legal right to receive dividends.

Similarly, holders of our common stock should be aware that repurchases of our common stock under any repurchase plan then in effect are completely discretionary, and may be suspended or discontinued at any time for any reason regardless of our financial position.

The current practice of our Board of Directors to pay common share dividends reflects a current intention to distribute to our shareholders a substantial portion of our cash flow. As a result, we may not retain a sufficient amount of cash to apply to other transactions that could be beneficial to our shareholders or debtholders, including stock buybacks, debt prepayments or capital expenditures that strengthen our business. In addition, our ability to pursue any material expansion of our business through acquisitions or increased capital spending may depend more than it otherwise would on our ability to obtain third party financing.

At December 31, 2016,2019, we had state NOL carryforwards of approximately $11.9$18 billion. A significant portion of the state NOL carryforwards are generated in states where separate company income tax returns are filed and our subsidiaries that generated the losses may not have the ability to generate income in sufficient amounts to realize these losses. In addition, certain of these state NOL carryforwards will be limited by state laws related to ownership changes. As a result, we expect to utilize only a small portion of the state NOL carryforwards, and consequently have determined that as of December 31, 2016,2019, these state NOL carryforwards, net of federal benefit, had a net tax benefit (after giving effect to our valuation allowance) of $131$372 million.

As of December 31, 2019, we had approximately 36,000 active employees participating in our company sponsored benefit plans, approximately 72,00066,000 active and retired employees and surviving spouses eligible for post-retirement healthcare benefits, approximately 68,00066,000 pension retirees and approximately 14,00013,000 former employees with vested pension benefits participating in our benefit plans as of December 31, 2016,plans. The cost to fund the costs of pension and healthcare benefitsbenefit plans for our active and retired employees havehas a significant impact on our profitability. Our costs of maintaining our pension and healthcare plans, and the future funding requirements for these plans, are affected by several factors, most of which are outside our control, including:

Increased costs under these plans could reduce our profitability and increase our funding commitments to our pension plans. Any future material cash contributions could have a negative impact on our liquidity by reducing our cash flows available for other purposes. Similarly, depletion of assets placed in trust by us to fund these benefits, such as those discussed elsewhere herein, will similarly reduce our liquidity by reducingrequiring us to deploy a portion of our cash flows available for other purposes.to fund such benefit payments.

As of December 31, 2016,2019, our pension plans and our other post-retirement benefit plans were substantially underfunded from an accounting standpoint. See Note 9—11—Employee Benefits to our consolidated financial statements included in Item 8 of this annual report. For more information on our obligations under our defined benefit pension plans and other post-retirement benefit plans, please see “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Liquidity and Capital Resources—Pension and Post-retirement Benefit Obligations” included in Item 7 of this annual report.

For additional information concerning our liquidity and capital resources, see Item 7 of this annual report. For a discussion of certain currency and liquidity risks associated with our international operations, see "Risk Factors—Risks Affecting Our Business—Our international operations expose us to various regulatory, currency, tax, legal and other risks."

A substantial number of our domestic facilities are located in Florida, Alabama, Louisiana, Texas, North Carolina, South Carolina and other coastal states, which subjects them to the risks associated with severe tropical storms, hurricanes and tornadoes, and many other of our facilities are subject to the risk of earthquakes, floods or other similar casualty events. These events could cause substantial damages, including downed telephone lines, flooded facilities, power outages, fuel shortages, damaged or destroyed property and equipment, and work interruptions. Although we maintain property and casualty insurance on our property (excluding our above ground outside plant) and may, under certain circumstances, be able to seek recovery of some additional costs through increased rates, only a portion of our additional costs directly related to such natural disasters have historically been recoverable. We cannot predict whether we will continue to be able to obtain insurance for catastrophic hazard-related damageslosses or, if obtainable and carried, whether this insurance will be adequate to cover oursuch losses. In addition, we expect any insurance of this nature to be subject to substantial deductibles, retentions and coverage exclusions, and the premiums to be based on our loss experience. Moreover, many climate experts have predicted an increase in extreme weather events in the future, which would increase our exposure to casualty risks. For all these reasons, any future hazard-related costs and work interruptions could adversely affect our operations and our financial condition.

The preparation of financial statements and related disclosures in conformity with U.S. generally accepted accounting principles ("GAAP") requires management to make judgments, assumptions and estimates that affect the amounts reported in our consolidated financial statements and accompanying notes. Ournotes including the judgments, assumptions and estimates applied pursuant to our critical accounting policies, which are described in “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Critical Accounting Policies and Estimates” in Item 7 of Part II of this annual report, describe those significant accounting policies and methods used in the preparation of our consolidated financial statements that are considered “critical” because they require judgments, assumptions and estimates that materially impact our consolidated financial statements and related disclosures. As a result, ifreport. If future events or assumptions differ significantly from the judgments, assumptions and estimates applied in connection with preparing our critical accounting policies, these events or assumptions could have a material impact on our consolidatedhistorical financial statements, and related disclosures.our future financial statements could be materially impacted.

While frequently presented with numeric specificity, the guidance and other forward-looking statements that we disseminate from time to time is based on numerous variables and assumptions (including, but not limited to, those related to industry performance and competition and general business, economic, market and financial conditions and additional matters specific to our business, as applicable) that are inherently subjective and uncertainspeculative and are largely beyond our control. As a result, actual results may differ materially from our guidance or other forward-looking statements. Similarly, for a variety of reasons, we may change our intentions, strategies or plans at any time, which could materially alter our actual results from those previously anticipated. For additional information, see "Special Note Regarding Forward-Looking Statements and Related Matters"Statements" in Item 1 of Part Ithis report.

In February 2019, we announced our expectation of attaining by the end of a three-year period $800 million to $1.0 billion of annualized run-rate Adjusted EBITDA (as defined in our quarterly earnings releases filed with the SEC) synergies and savings from our ongoing transformational initiatives, excluding $450 to $650 million in one-time costs to achieve these savings. Although we believe we are on track to attain these savings within this annual report.time frame, we cannot assure you of this.

There can be no assurance that our disclosure controls and procedures or internal control over financial reporting will be effective in the future. As a result, it is possible that our current or future financial statements or that weSEC reports may not comply with generally accepted accounting principles or other applicable requirements, will contain a material misstatement or omission, or will not experiencebe available on a material weaknesstimely basis, any of which could cause investors to lose confidence in us and lead to, among other things, unanticipated legal, accounting and other expenses, delays in filing required financial disclosures or significant deficiency in internal control over financial reporting. Any such lapses or deficiencies may materially and adversely affectreports, enforcement actions by regulatory authorities, fines, penalties, the delisting of our business, operating results or financial condition, restrict our abilitysecurities, liabilities arising from shareholder litigation, restricted access to access the capital markets require us to expend significant resources to correct the lapses or deficiencies, expose us to regulatory or legal proceedings, including litigation brought by private individuals, subject us to fines, penalties or judgments, harmand lower valuations of our reputation, or otherwise cause a decline in investor confidence and our stock price.securities.

As of December 31, 2016,2019, approximately 51%48% of our total consolidated assets reflected on the consolidated balance sheet included in this annual report consisted of goodwill, (excluding goodwill assigned to the colocation business and included in assets held for sale), customer relationships and other intangible assets. Under U.S. generally accepted accounting principles, most of these intangible assets must be tested for impairment on an annual basis or more frequently whenever events or circumstances indicate that their carrying value may not be recoverable. From time to time, (most recently forincluding in the thirdfourth quarter of 2013),2018 and the first quarter of 2019, we have recorded large non-cash charges to earnings in connection with required reductions of the value of our intangible assets. If our intangible assets are determined to be impaired in the future, we may be required to record additional significant, non-cash charges to earnings during the period in which the impairment is determined to have occurred. Any such charges could, in turn, have a material adverse effect on our results of operation, financial condition or ability to comply with financial covenants in our debt instruments. Moreover, even if we conclude that our intangible assets are recorded at carrying values that are recoverable, we cannot assure you of the amount of cash we would receive in the event of a voluntary or involuntary sale of these assets.

Like all large multinational businesses, we are subject to multiple sets of complex and varying foreign, federal, state and local tax laws and rules. Legislators and regulators at various levels of government may from time to time change existing tax laws or regulations or enact new laws or regulations. In many cases, the application of existing, newly enacted or amended tax laws may be uncertain and subject to differing interpretations that could negatively impact our operating results or financial condition. We are also subject to frequent and regular audits by the Internal Revenue Service as well asa broad range of foreign, federal, state and local tax authorities. These audits could subject us to tax liabilities if adverse positions are taken by these tax authorities.

We believe that we have adequately provided for tax contingencies. However, our tax audits and examinations may result in tax liabilities that differ materially from those that we have recognized in our consolidated financial statements. Because the ultimate outcomes of all of these matters are uncertain, we can give no assurance as to whether an adverse result from one or more of them will have a material effect on our financial results.

Our articles of incorporation currently authorize us to issue additional shares of our common stock, frequently without shareholder approval. Such additional issuances may dilute the beneficial ownership and regulators atvoting power of our shareholders, and could reduce the trading price of our common stock. Similarly, the market price of our common stock could drop significantly if certain large holders of our common stock sell all levelsor a substantial portion of government maytheir holdings in the public markets, or indicate their intent to do so. Similarly, the market price of our stock could be adversely affected if analysts or other market participants issue reports or make other statements that recommend the sale of our shares, or if we report financial results or other developments that are viewed negatively by investors.

In addition to other restrictions mentioned above, a number of provisions in our agreements and organizational documents and various provisions of applicable law may delay, defer or prevent a future takeover of CenturyLink unless the takeover is approved by our Board of Directors. These provisions could deprive our shareholders of any related takeover premium. For additional information, please see our Registration Statement on Form 8-A/A filed with the SEC on March 2, 2015.