Organization and Summary of Significant Accounting Policies (Notes)	6 Months Ended
Jun. 30, 2016
Accounting Policies [Abstract]
Organization and Summary of Significant Accounting Policies	Organization and Summary of Significant Accounting Policies Description of Business Level 3 Communications, Inc. and subsidiaries (the "Company" or "Level 3") is an international facilities-based provider (that is, a provider that owns or leases a substantial portion of the plant, property and equipment necessary to provide its services) of a broad range of integrated communications services. The Company created its communications network by constructing its own assets and through a combination of purchasing other companies and purchasing or leasing facilities from others. The Company designed its network to provide communications services that employ and take advantage of rapidly improving underlying optical, Internet Protocol, computing and storage technologies. Principles of Consolidation and Basis of Presentation The Consolidated Financial Statements include the accounts of Level 3 Communications, Inc. and subsidiaries in which it has a controlling interest. All significant intercompany accounts and transactions have been eliminated. The accompanying Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States ("GAAP"). As part of its consolidation policy, the Company considers its controlled subsidiaries, investments in businesses in which the Company is not the primary beneficiary or does not have effective control but has the ability to significantly influence operating and financial policies, and variable interests resulting from economic arrangements that give the Company rights to economic risks or rewards of a legal entity. The Company does not have variable interests in a variable interest entity where it is required to consolidate the entity as the primary beneficiary. Prior to October 1, 2015, the Company included the results of its wholly owned Venezuelan subsidiary in its Consolidated Financial Statements using the consolidation method of accounting. The Company’s Venezuelan subsidiary was in the Latin America segment and had total revenue of $24 million and $47 million, with Adjusted EBITDA of $15 million and $30 million, for the three and six months ended June 30, 2015, respectively. For more information on the Company's segments and non-GAAP measures see Note 8 - Segment Information. Venezuelan exchange control regulations have resulted in an other-than-temporary lack of exchangeability between the Venezuelan bolivar and U.S. dollar, and have restricted the Company's Venezuelan operations’ ability to pay dividends and settle intercompany obligations in U.S. dollars. The severe currency controls imposed by the Venezuelan government have significantly limited the ability to realize the benefits from earnings of the Company’s Venezuelan operations and access the resulting liquidity provided by those earnings in U.S. dollars. The Company expects that this condition will continue for the foreseeable future. Additionally, government regulations affecting the Company's ability to manage its Venezuelan subsidiary’s capital structure, purchasing, product pricing, customer invoicing and collections, and labor relations; and the current political and economic situation within Venezuela have resulted in an acute degradation in the Company's ability to make key operational decisions for its Venezuelan operations. This lack of exchangeability into U.S. dollars and the degradation in the Company's ability to control key operational decisions has resulted in a lack of control over the Company's Venezuelan subsidiary for U.S. accounting purposes. Therefore, while continuing to wholly own its Venezuelan subsidiary, the Company concluded it no longer met the accounting criteria for consolidation and deconsolidated its Venezuelan subsidiary on September 30, 2015, and began accounting for its variable interest investment in its Venezuelan operations using the cost method of accounting. The factors that led to the Company's conclusions at the end of the third quarter of 2015 continued to exist through the end of the second quarter of 2016. Any dividends from the Company's Venezuelan subsidiary are recorded as other income upon receipt of the cash in U.S. dollars. Prior period results have not been adjusted to reflect the deconsolidation of the Company's Venezuelan subsidiary. The accompanying Consolidated Balance Sheet as of December 31, 2015, which was derived from audited Consolidated Financial Statements, and the unaudited interim Consolidated Financial Statements as of June 30, 2016 and for the six months ended June 30, 2016 and 2015 have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”) for quarterly reports on Form 10-Q and do not include all of the information and note disclosures required by GAAP for complete financial statements. These financial statements should be read in conjunction with the Company’s audited Consolidated Financial Statements and notes thereto included in the Company’s Form 10-K for the year ended December 31, 2015. In the opinion of the Company’s management, these financial statements contain all adjustments necessary for a fair presentation of financial position, results of operations and cash flows at the dates and for the interim periods presented herein. The results of operations for an interim period are not necessarily indicative of the results of operations expected for a full fiscal year. The preparation of the Consolidated Financial Statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities and the reported amounts of revenue and expenses during the reported period. Actual results could differ from these estimates under different assumptions or conditions and such differences could be material. Reclassifications Certain amounts in the prior year Consolidated Financial Statements and accompanying footnotes have been reclassified to conform to the current year's presentation primarily pursuant to the adoption of Accounting Standards Update ("ASU") 2015-03, Simplifying the Presentation of Debt Issuance Costs. As of December 31, 2015, approximately $19 million of current debt issuance costs have been reclassified from other current assets to long-term debt, less current portion and approximately $109 million of non-current debt issuance costs have been reclassified from other non-current assets to long-term debt, less current portion. Recently Issued Accounting Pronouncements In March 2016, the Financial Accounting Standards Board (“FASB”) issued ASU No. 2016-09, Improvements to Employee Share-Based Payment Accounting, as part of its simplification initiative, which involves several aspects of accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. The amendments in this update are effective for annual periods beginning after December 15, 2016, and interim periods within those annual periods. Early adoption is permitted. The Company is evaluating the effect of the adoption of this standard as early as the third quarter of 2016, and estimates this adoption would reduce income tax expense by a range of $18 million to $24 million and would lower the Company's effective income tax rate for the year ended 2016. In February 2016, the FASB issued ASU 2016-02, Leases (ASC Topic 842), which requires entities that lease assets to recognize on the balance sheet the assets and liabilities for the rights and obligations created by those leases. This ASU will replace most existing leasing guidance in U.S. GAAP when it becomes effective. The new standard is effective for fiscal years beginning after December 15, 2018, and interim periods within those years. Early application is permitted. The standard requires the use of a modified retrospective transition method. The Company is evaluating the effect that ASU 2016-02 will have on its Consolidated Financial Statements and related disclosures, and expects the new guidance to significantly increase the reported assets and liabilities on its Consolidated Balance Sheets. In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers ASC Topic 606), which requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. This ASU will replace most existing revenue recognition guidance in U.S. GAAP when it becomes effective. The new standard is effective for fiscal years beginning after December 15, 2017, and interim periods within those years. Earlier application is permitted only as of annual reporting periods beginning after December 15, 2016, including interim reporting periods within that reporting period. The standard permits the use of either the retrospective or cumulative effect transition method. The Company is evaluating the effect that ASU 2014-09 will have on its Consolidated Financial Statements and related disclosures and has not yet selected a transition method nor has it determined the effect of the standard on its ongoing financial reporting.

Organization and Summary of Significant Accounting Policies

Description of Business

Level 3 Communications, Inc. and subsidiaries (the "Company" or "Level 3") is an international facilities-based provider (that is, a provider that owns or leases a substantial portion of the plant, property and equipment necessary to provide its services) of a broad range of integrated communications services. The Company created its communications network by constructing its own assets and through a combination of purchasing other companies and purchasing or leasing facilities from others. The Company designed its network to provide communications services that employ and take advantage of rapidly improving underlying optical, Internet Protocol, computing and storage technologies.

Principles of Consolidation and Basis of Presentation

The Consolidated Financial Statements include the accounts of Level 3 Communications, Inc. and subsidiaries in which it has a controlling interest. All significant intercompany accounts and transactions have been eliminated. The accompanying Consolidated Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States ("GAAP").

As part of its consolidation policy, the Company considers its controlled subsidiaries, investments in businesses in which the Company is not the primary beneficiary or does not have effective control but has the ability to significantly influence operating and financial policies, and variable interests resulting from economic arrangements that give the Company rights to economic risks or rewards of a legal entity. The Company does not have variable interests in a variable interest entity where it is required to consolidate the entity as the primary beneficiary.

Prior to October 1, 2015, the Company included the results of its wholly owned Venezuelan subsidiary in its Consolidated Financial Statements using the consolidation method of accounting. The Company’s Venezuelan subsidiary was in the Latin America segment and had total revenue of $24 million and $47 million, with Adjusted EBITDA of $15 million and $30 million, for the three and six months ended June 30, 2015, respectively. For more information on the Company's segments and non-GAAP measures see Note 8 - Segment Information.

Venezuelan exchange control regulations have resulted in an other-than-temporary lack of exchangeability between the Venezuelan bolivar and U.S. dollar, and have restricted the Company's Venezuelan operations’ ability to pay dividends and settle intercompany obligations in U.S. dollars. The severe currency controls imposed by the Venezuelan government have significantly limited the ability to realize the benefits from earnings of the Company’s Venezuelan operations and access the resulting liquidity provided by those earnings in U.S. dollars. The Company expects that this condition will continue for the foreseeable future. Additionally, government regulations affecting the Company's ability to manage its Venezuelan subsidiary’s capital structure, purchasing, product pricing, customer invoicing and collections, and labor relations; and the current political and economic situation within Venezuela have resulted in an acute degradation in the Company's ability to make key operational decisions for its Venezuelan operations. This lack of exchangeability into U.S. dollars and the degradation in the Company's ability to control key operational decisions has resulted in a lack of control over the Company's Venezuelan subsidiary for U.S. accounting purposes. Therefore, while continuing to wholly own its Venezuelan subsidiary, the Company concluded it no longer met the accounting criteria for consolidation and deconsolidated its Venezuelan subsidiary on September 30, 2015, and began accounting for its variable interest investment in its Venezuelan operations using the cost method of accounting. The factors that led to the Company's conclusions at the end of the third quarter of 2015 continued to exist through the end of the second quarter of 2016. Any dividends from the Company's Venezuelan subsidiary are recorded as other income upon receipt of the cash in U.S. dollars. Prior period results have not been adjusted to reflect the deconsolidation of the Company's Venezuelan subsidiary.

The accompanying Consolidated Balance Sheet as of December 31, 2015, which was derived from audited Consolidated Financial Statements, and the unaudited interim Consolidated Financial Statements as of June 30, 2016 and for the six months ended June 30, 2016 and 2015 have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”) for quarterly reports on Form 10-Q and do not include all of the information and note disclosures required by GAAP for complete financial statements. These financial statements should be read in conjunction with the Company’s audited Consolidated Financial Statements and notes thereto included in the Company’s Form 10-K for the year ended December 31, 2015. In the opinion of the Company’s management, these financial statements contain all adjustments necessary for a fair presentation of financial position, results of operations and cash flows at the dates and for the interim periods presented herein. The results of operations for an interim period are not necessarily indicative of the results of operations expected for a full fiscal year.

The preparation of the Consolidated Financial Statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities and the reported amounts of revenue and expenses during the reported period. Actual results could differ from these estimates under different assumptions or conditions and such differences could be material.

Reclassifications

Certain amounts in the prior year Consolidated Financial Statements and accompanying footnotes have been reclassified to conform to the current year's presentation primarily pursuant to the adoption of Accounting Standards Update ("ASU") 2015-03, Simplifying the Presentation of Debt Issuance Costs. As of December 31, 2015, approximately $19 million of current debt issuance costs have been reclassified from other current assets to long-term debt, less current portion and approximately $109 million of non-current debt issuance costs have been reclassified from other non-current assets to long-term debt, less current portion.

Recently Issued Accounting Pronouncements

In March 2016, the Financial Accounting Standards Board (“FASB”) issued ASU No. 2016-09, Improvements to Employee Share-Based Payment Accounting, as part of its simplification initiative, which involves several aspects of accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. The amendments in this update are effective for annual periods beginning after December 15, 2016, and interim periods within those annual periods. Early adoption is permitted. The Company is evaluating the effect of the adoption of this standard as early as the third quarter of 2016, and estimates this adoption would reduce income tax expense by a range of $18 million to $24 million and would lower the Company's effective income tax rate for the year ended 2016.

In February 2016, the FASB issued ASU 2016-02, Leases (ASC Topic 842), which requires entities that lease assets to recognize on the balance sheet the assets and liabilities for the rights and obligations created by those leases. This ASU will replace most existing leasing guidance in U.S. GAAP when it becomes effective. The new standard is effective for fiscal years beginning after December 15, 2018, and interim periods within those years. Early application is permitted. The standard requires the use of a modified retrospective transition method. The Company is evaluating the effect that ASU 2016-02 will have on its Consolidated Financial Statements and related disclosures, and expects the new guidance to significantly increase the reported assets and liabilities on its Consolidated Balance Sheets.

In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers ASC Topic 606), which requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. This ASU will replace most existing revenue recognition guidance in U.S. GAAP when it becomes effective. The new standard is effective for fiscal years beginning after December 15, 2017, and interim periods within those years. Earlier application is permitted only as of annual reporting periods beginning after December 15, 2016, including interim reporting periods within that reporting period. The standard permits the use of either the retrospective or cumulative effect transition method. The Company is evaluating the effect that ASU 2014-09 will have on its Consolidated Financial Statements and related disclosures and has not yet selected a transition method nor has it determined the effect of the standard on its ongoing financial reporting.