Organization and Summary of Significant Accounting Policies (Policy)	12 Months Ended
	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Use of Estimates	Use of Estimates The preparation of consolidated financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting periods. Significant items subject to such estimates and assumptions include the streaming content asset amortization policy and the recognition and measurement of income tax assets and liabilities. The Company bases its estimates on historical experience and on various other assumptions that the Company believes to be reasonable under the circumstances. On an ongoing basis, the Company evaluates these assumptions, judgments and estimates. Actual results may differ from these estimates.
Recently adopted accounting pronouncements	Recently adopted accounting pronouncements In March 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2016-09, Improvements to Employee Share-Based Payment Accounting, which amends Accounting Standards Codification ("ASC") Topic 718, Compensation – Stock Compensation. ASU 2016-09 simplifies several aspects of the 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. Under the new standard, all excess tax benefits and tax deficiencies are recorded as a component of the provision for income taxes in the reporting period in which they occur. Additionally, ASU 2016-09 requires that the Company present excess tax benefits on the Statement of Cash Flows as an operating activity. ASU 2016-09 is effective for fiscal years beginning after December 15, 2016, and interim periods within those fiscal years. The Company adopted ASU 2016-09 in fiscal year 2017 and elected to apply this adoption prospectively. Prior periods have not been adjusted. See Note 9 to the consolidated financial statements for information regarding the impact on the Company’s financial statements. In January 2017, the FASB issued ASU 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business. The standard provides guidance to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. If substantially all of the fair value of the gross assets acquired (or disposed of) is concentrated in a single asset or a group of similar assets, the assets acquired (or disposed of) are not considered a business. ASU 2017-01 is effective for fiscal periods beginning after December 15, 2017 (including interim periods within those periods) with early adoption permitted. The Company early adopted the standard in the third quarter of 2017 on a prospective basis and the impact on its consolidated financial statements was not material. Recently issued accounting pronouncements not yet adopted In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606) which amended the existing accounting standards for revenue recognition. ASU 2014-09 establishes principles for recognizing revenue upon the transfer of promised goods or services to customers, in an amount that reflects the expected consideration received in exchange for those goods or services. In July 2015, the FASB deferred the effective date for annual reporting periods beginning after December 15, 2017 (including interim reporting periods within those periods). The amendments may be applied retrospectively to each prior period (full retrospective) or retrospectively with the cumulative effect recognized as of the date of initial application (modified retrospective). The Company will adopt ASU 2014-09 in the first quarter of 2018 and apply the modified retrospective approach. Because the Company's primary source of revenues is from monthly membership fees which are recognized ratably over each monthly membership period, the Company does not expect the impact on its consolidated financial statements to be material. In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842) in order to increase transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet for those leases classified as operating leases under previous GAAP. ASU 2016-02 requires that a lessee should recognize a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term on the balance sheet. ASU 2016-02 is effective for fiscal years beginning after December 15, 2018 (including interim periods within those periods) using a modified retrospective approach and early adoption is permitted. The Company will adopt ASU 2016-02 in the first quarter of 2019. Although the Company is in the process of evaluating the impact of adoption of the ASU on its consolidated financial statements, the Company currently believes the most significant changes will be related to the recognition of new right-of-use assets and lease liabilities on the Company's balance sheet for real estate operating leases. In November 2016, the FASB issued ASU 2016-18, Restricted Cash, which requires amounts generally described as restricted cash and restricted cash equivalents be included with cash and cash equivalents when reconciling the total beginning and ending amounts for the periods shown on the statement of cash flows. ASU 2016-08 is effective for fiscal years beginning after December 15, 2017 (including interim periods within those periods) using a retrospective transition method to each period presented. The Company will adopt ASU 2016-18 in the first quarter of 2018 and does not expect the impact on its consolidated financial statements to be material. In January 2018, the FASB released guidance on the accounting for tax on the global intangible low-taxed income ("GILTI") provisions of the Tax Cuts and Jobs Act (the "Act"). The GILTI provisions impose a tax on foreign income in excess of a deemed return on tangible assets of foreign corporations. The guidance indicates that either accounting for deferred taxes related to GILTI inclusions or to treat any taxes on GILTI inclusions as period cost are both acceptable methods subject to an accounting policy election. Effective the first quarter of 2018, the Company will elect to treat any potential GILTI inclusions as a period cost as we are not projecting any material impact from GILTI inclusions and any deferred taxes related to any i
Cash Equivalents and Short-Term Investments	Cash Equivalents and Short-term Investments The Company considers investments in instruments purchased with an original maturity of 90 days or less to be cash equivalents. The Company also classifies amounts in transit from payment processors for customer credit card and debit card transactions as cash equivalents. In July 2017, the Company sold all short-term investments. The Company classified short-term investments, which consisted of marketable securities with original maturities in excess of 90 days as available-for-sale. Short-term investments were reported at fair value with unrealized gains and losses included in “Accumulated other comprehensive loss” within Stockholders’ equity in the Consolidated Balance Sheets. The amortization of premiums and discounts on the investments, realized gains and losses, and declines in value judged to be other-than-temporary on available-for-sale securities are included in “Interest and other income (expense)” in the Consolidated Statements of Operations. The Company used the specific identification method to determine cost in calculating realized gains and losses upon the sale of short-term investments. Short-term investments were reviewed periodically to identify possible other-than-temporary impairment. When evaluating the investments, the Company reviewed factors such as the length of time and extent to which fair value has been below cost basis, the financial condition of the issuer, the Company’s intent to sell, or whether it would be more likely than not that the Company would be required to sell the investments before the recovery of their amortized cost basis.
Streaming Content	Streaming Content The Company acquires, licenses and produces content, including original programming, in order to offer members unlimited viewing of TV shows and films. The content licenses are for a fixed fee and specific windows of availability. Payment terms for certain content licenses and the production of content require more upfront cash payments relative to the amortization expense. Payments for content, including additions to streaming assets and the changes in related liabilities, are classified within "Net cash used in operating activities" on the Consolidated Statements of Cash Flows. For licenses, the Company capitalizes the fee per title and records a corresponding liability at the gross amount of the liability when the license period begins, the cost of the title is known and the title is accepted and available for streaming. The portion available for streaming within one year is recognized as “Current content assets, net” and the remaining portion as “Non-current content assets, net” on the Consolidated Balance Sheets. For productions, the Company capitalizes costs associated with the production, including development costs, direct costs and production overhead. These amounts are included in "Non-current content assets, net" on the Consolidated Balance Sheets. Participations and residuals are expensed in line with the amortization of production costs. Based on factors including historical and estimated viewing patterns, the Company amortizes the content assets (licensed and produced) in “Cost of revenues” on the Consolidated Statements of Operations over the shorter of each title's contractual window of availability or estimated period of use or 10 years, beginning with the month of first availability. The amortization is on an accelerated basis, as the Company typically expects more upfront viewing, for instance due to additional merchandising and marketing efforts. The Company reviews factors impacting the amortization of the content assets on an ongoing basis. The Company's estimates related to these factors require considerable management judgment. The Company's business model is subscription based as opposed to a model generating revenues at a specific title level. Therefore, content assets, both licensed and produced, are reviewed in aggregate at the operating segment level when an event or change in circumstances indicates a change in the expected usefulness of the content or that the net realizable value or fair value may be less than amortized cost. To date, the Company has not identified any such event or changes in circumstances. If such changes are identified in the future, these aggregated content assets will be stated at the lower of unamortized cost, net realizable value or fair value. In addition, unamortized costs for assets that have been, or are expected to be, abandoned are written off.
Property and Equipment	Property and Equipment Property and equipment are carried at cost less accumulated depreciation. Depreciation is calculated using the straight-line method over the shorter of the estimated useful lives of the respective assets, generally up to 30 years, or the lease term for leasehold improvements, if applicable. Leased buildings are capitalized and included in property and equipment when the Company was involved in the construction funding and did not meet the “sale-leaseback” criteria.
Revenue Recognition	Revenue Recognition The Company's primary source of revenues are from monthly membership fees. Members are billed in advance of the start of their monthly membership and revenues are recognized ratably over each monthly membership period. Revenues are presented net of the taxes that are collected from members and remitted to governmental authorities. Deferred revenue consists of membership fees billed that have not been recognized and gift and other prepaid memberships that have not been redeemed.
Marketing	Marketing Marketing expenses consist primarily of advertising expenses and certain payments made to the Company’s partners, including consumer electronics (“CE”) manufacturers, multichannel video programming distributors (“MVPDs”), mobile operators and internet service providers (“ISPs”). Advertising expenses include promotional activities such as digital and television advertising. Advertising costs are expensed as incurred.
Research and Development	Research and Development Research and development expenses are included within "Technology and Development" on the Company's Consolidated Statements of Operations and primarily consist of payroll and related costs incurred in making improvements to our service offerings.
Income Taxes	Income Taxes The Company records a provision for income taxes for the anticipated tax consequences of the reported results of operations using the asset and liability method. Deferred income taxes are recognized by applying enacted statutory tax rates applicable to future years to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases as well as net operating loss and tax credit carryforwards. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. The measurement of deferred tax assets is reduced, if necessary, by a valuation allowance for any tax benefits for which future realization is uncertain. The Company did not recognize certain tax benefits from uncertain tax positions within the provision for income taxes. The Company may recognize a tax benefit only if it is more likely than not the tax position will be sustained on examination by the taxing authorities, based on the technical merits of the position. The tax benefits recognized in the financial statements from such positions are then measured based on the largest benefit that has a greater than 50% likelihood of being realized upon settlement. The Company recognizes interest and penalties related to uncertain tax positions in income tax expense.
Foreign Currency	Foreign Currency The functional currency for the Company's subsidiaries is determined based on the primary economic environment in which the subsidiary operates. The Company translates the assets and liabilities of its non-U.S. dollar functional currency subsidiaries into U.S. dollars using exchange rates in effect at the end of each period. Revenues and expenses for these subsidiaries are translated using rates that approximate those in effect during the period. Gains and losses from these translations are recognized in cumulative translation adjustment included in "Accumulated other comprehensive loss" in Stockholders’ equity on the Consolidated Balance Sheets. Prior to January 1, 2015, the functional currency of certain of the Company's European entities was the British pound. The Company changed the functional currency of these entities to the euro effective January 1, 2015 following the redomiciliation of the European headquarters and the launch of the Netflix service in several significant European countries. The change in functional currency was applied prospectively from January 1, 2015. Monetary assets and liabilities have been remeasured to the euro at current exchange rates. Non-monetary assets and liabilities have been remeasured to the euro using the exchange rate effective for the period in which the balance arose. As a result of this change of functional currency, the Company recorded a $21.8 million cumulative translation adjustment included in other comprehensive loss for year ended December 31, 2015. The Company remeasures monetary assets and liabilities that are not denominated in the functional currency at exchange rates in effect at the end of each period. Gains and losses from these remeasurements are recognized in interest and other income (expense).
Earnings Per Share	Basic earnings per share is computed using the weighted-average number of outstanding shares of common stock during the period. Diluted earnings per share is computed using the weighted-average number of outstanding shares of common stock and, when dilutive, potential common shares outstanding during the period. Potential common shares consist of incremental shares issuable upon the assumed exercise of stock options.
Stock-Based Compensation	Stock-Based Compensation The Company grants fully vested non-qualified stock options to its employees on a monthly basis. As a result of immediate vesting, stock-based compensation expense is fully recognized on the grant date, and no estimate is required for post-vesting option forfeitures.