Description of Business and Basis of Presentation (Policies)	9 Months Ended
Mar. 31, 2019
Accounting Policies [Abstract]
Principles of Consolidation and Combination	The Unaudited Consolidated and Combined Financial Statements include, for periods prior to the Distribution, certain assets and liabilities that were historically held at 21CF’s corporate level but are specifically identifiable or otherwise attributable to the Company. All significant intracompany transactions and accounts within the Company’s consolidated and combined businesses have been eliminated. Intercompany transactions with 21CF or its affiliates and the Company are reflected in the historical Unaudited Consolidated and Combined Financial Statements for periods prior to the Distribution. All significant intercompany balances between 21CF and the Company, for periods prior to the Distribution, have been included within the Twenty-First Century Fox, Inc. investment in these Unaudited Consolidated and Combined Financial Statements. Any change in the Company’s ownership interest in a consolidated or combined subsidiary, where a controlling financial interest is retained, is accounted for as a capital transaction. When the Company ceases to have a controlling interest in a consolidated or combined subsidiary, the Company will recognize a gain or loss in net income upon deconsolidation.
Use of Estimates	The preparation of the Company’s Unaudited Consolidated and Combined Financial Statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts that are reported in the Unaudited Consolidated and Combined Financial Statements and accompanying disclosures. Although these estimates are based on management’s best knowledge of current events and actions that the Company may undertake in the future, actual results may differ from those estimates.
Reclassifications and Adjustments	The Company’s fiscal year ends on June 30 of each year. Certain fiscal 2018 amounts have been reclassified to conform to the fiscal 2019 presentation.
Earnings per Share	Earnings per Share Basic earnings per share for the Class A Common Stock and Class B common stock is calculated by dividing Net income attributable to Fox Corporation stockholders by the weighted average number of outstanding shares of Class A Common Stock, including vested Restricted Stock Units (“RSUs”), and Class B Common Stock. Diluted earnings per share for the Class A Common Stock and Class B Common Stock is calculated similarly, except that the calculation for the Class A Common Stock includes the dilutive effect of the assumed issuance of the shares issuable under the Company’s equity-based compensation plan. On March 19, 2019, the date of the Distribution, 621 million shares of the Company’s Common Stock were distributed to 21CF stockholders (other than holders that were subsidiaries of 21CF). These 621 million shares have been utilized for the calculation of basic and diluted earnings per share for all periods presented that ended prior to the date of the Distribution as no shares of common stock or equity-based awards of the Company were outstanding prior to that date (See Note 7 – Equity-Based Compensation).
Recently Adopted and Recently Issued Accounting Guidance and U.S. Tax Reform	Recently Adopted and Recently Issued Accounting Guidance and U.S. Tax Reform Adopted In January 2016, the Financial Accounting Standards Board (“FASB”) issued ASU 2016-01, “Financial Instruments––Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities” (“ASU 2016-01”). The amendments in ASU 2016-01 address certain aspects of recognition, measurement, presentation and disclosure of financial instruments. The Company adopted this guidance as of July 1, 2018 on a modified retrospective basis and recorded a cumulative effect adjustment to reclassify unrealized holding gains on securities within Accumulated other comprehensive (loss) income to Twenty-First Century Fox, Inc. investment (See Note 6 – Stockholders’ Equity). In addition, the Company recorded changes in the fair value of equity investments with readily determinable fair values in Net income rather than in Accumulated other comprehensive (loss) income (See Note 12 – Additional Financial Information under the heading “Other, net”). Cost method investments that do not have readily determinable fair values will be recognized prospectively at cost minus impairment, if any, plus or minus changes resulting from observable price changes in orderly transactions for the identical or a similar investment of the same issuer. The adjustments related to the observable price changes will also be recognized in net income. On July 1, 2018, the Company early adopted ASU 2018-02, “Income Statement—Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income” (“ASU 2018-02”) on a prospective basis using the security-by-security approach. The objective of ASU 2018-02 is to eliminate the stranded tax effects resulting from the Tax Act (as defined below) and to improve the usefulness of information reported to financial statement users. The adoption of ASU 2018-02 resulted in a reclassification from Accumulated other comprehensive (loss) income to Twenty-First Century Fox, Inc. investment related to the income tax effects on the change in the federal statutory rate (See Note 6 – Stockholders’ Equity). Issued In February 2016, the FASB issued ASU 2016-02, “Leases (Topic 842)” (“Topic 842”), as amended. Topic 842 requires recognition of lease liabilities and right-of-use assets on the balance sheet and disclosure of key information about leasing arrangements. Topic 842 will be effective for the Company for annual and interim reporting periods beginning July 1, 2019. The Company expects to apply Topic 842 on a modified retrospective basis with the cumulative effect, if any, of initially applying the new guidance recognized at the date of adoption as an adjustment to opening retained earnings. The Company is currently evaluating the impact Topic 842 will have on its consolidated financial statements, including determining which practical expedients to apply. Since the Company has a significant amount of minimum lease commitments (See Note 11 – Commitments and Contingencies in the Form 10), the Company expects that the impact of recognizing operating lease liabilities and right-of-use assets will be significant to the Company’s Consolidated Balance Sheet. The Company is in process of gathering the necessary lease data and implementing accounting lease software for all leases as well as assessing necessary changes to the Company’s processes and controls to support the recognition and disclosure requirements in accordance with the new standard. In March 2019, the FASB issued ASU 2019-02, “Entertainment—Films—Other Assets—Film Costs (Subtopic 926-20) and Entertainment—Broadcasters—Intangibles—Goodwill and Other (Subtopic 920-350): Improvements to Accounting for Costs of Films and License Agreements for Program Materials” (“ASU 2019-02”). The amendments in ASU 2019-02 align the accounting for production costs of episodic television series with the accounting for production costs of films. In addition, ASU 2019-02 modifies certain aspects of the capitalization, impairment, presentation and disclosure requirements in Accounting Standards Codification (“ASC”) 926-20 and the impairment, presentation and disclosure requirements in ASC 920-350. ASU 2019-02 will be effective for the Company for annual and interim reporting periods beginning July 1, 2020 on a prospective basis. Early adoption is permitted. The Company is currently evaluating the impact ASU 2019-02 will have on its consolidated financial statements. U.S. Tax Reform On December 22, 2017, the U.S. government enacted tax legislation commonly referred to as the Tax Cuts and Jobs Act (the “Tax Act”). The Tax Act significantly revises the future ongoing U.S. corporate income tax by, among other things, lowering U.S. corporate income tax rates and implementing a territorial tax system. Effective July 1, 2018, the Company’s corporate income tax rate is 21%. The SEC issued guidance that allowed for a measurement period of up to one year after the enactment date of the Tax Act to finalize the recording of the related tax impacts. In December 2018, the Company finalized its analysis and has not materially modified the provisional amounts previously recorded in the combined financial statements (See Note 2 – Summary of Significant Accounting Policies in the Form 10 under the heading “U.S. Tax Reform”).
Concentrations of Credit Risk	Concentrations of Credit Risk Cash and cash equivalents are maintained with several financial institutions. The Company has deposits held with banks that exceed the amount of insurance provided on such deposits. Generally, these deposits may be redeemed upon demand and are maintained with financial institutions of reputable credit and, therefore, bear minimal credit risk. Generally, the Company does not require collateral to secure receivables. As of March 31, 2019, the Company had one customer that accounted for approximately 13% of the Company’s receivables. As of June 30, 2018, the Company had two customers that accounted for approximately 21% of the Company’s receivables.

Description of Business and Basis of Presentation (Policies)

9 Months Ended

Mar. 31, 2019

Principles of Consolidation and Combination

The Unaudited Consolidated and Combined Financial Statements include, for periods prior to the Distribution, certain assets and liabilities that were historically held at 21CF’s corporate level but are specifically identifiable or otherwise attributable to the Company. All significant intracompany transactions and accounts within the Company’s consolidated and combined businesses have been eliminated.

Intercompany transactions with 21CF or its affiliates and the Company are reflected in the historical Unaudited Consolidated and Combined Financial Statements for periods prior to the Distribution. All significant intercompany balances between 21CF and the Company, for periods prior to the Distribution, have been included within the Twenty-First Century Fox, Inc. investment in these Unaudited Consolidated and Combined Financial Statements.

Any change in the Company’s ownership interest in a consolidated or combined subsidiary, where a controlling financial interest is retained, is accounted for as a capital transaction. When the Company ceases to have a controlling interest in a consolidated or combined subsidiary, the Company will recognize a gain or loss in net income upon deconsolidation.

Use of Estimates

The preparation of the Company’s Unaudited Consolidated and Combined Financial Statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts that are reported in the Unaudited Consolidated and Combined Financial Statements and accompanying disclosures. Although these estimates are based on management’s best knowledge of current events and actions that the Company may undertake in the future, actual results may differ from those estimates.

Reclassifications and Adjustments

The Company’s fiscal year ends on June 30 of each year. Certain fiscal 2018 amounts have been reclassified to conform to the fiscal 2019 presentation.

Earnings per Share

Basic earnings per share for the Class A Common Stock and Class B common stock is calculated by dividing Net income attributable to Fox Corporation stockholders by the weighted average number of outstanding shares of Class A Common Stock, including vested Restricted Stock Units (“RSUs”), and Class B Common Stock. Diluted earnings per share for the Class A Common Stock and Class B Common Stock is calculated similarly, except that the calculation for the Class A Common Stock includes the dilutive effect of the assumed issuance of the shares issuable under the Company’s equity-based compensation plan.

On March 19, 2019, the date of the Distribution, 621 million shares of the Company’s Common Stock were distributed to 21CF stockholders (other than holders that were subsidiaries of 21CF). These 621 million shares have been utilized for the calculation of basic and diluted earnings per share for all periods presented that ended prior to the date of the Distribution as no shares of common stock or equity-based awards of the Company were outstanding prior to that date (See Note 7 – Equity-Based Compensation).

Recently Adopted and Recently Issued Accounting Guidance and U.S. Tax Reform

Adopted

In January 2016, the Financial Accounting Standards Board (“FASB”) issued ASU 2016-01, “Financial Instruments––Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities” (“ASU 2016-01”). The amendments in ASU 2016-01 address certain aspects of recognition, measurement, presentation and disclosure of financial instruments. The Company adopted this guidance as of July 1, 2018 on a modified retrospective basis and recorded a cumulative effect adjustment to reclassify unrealized holding gains on securities within Accumulated other comprehensive (loss) income to Twenty-First Century Fox, Inc. investment (See Note 6 – Stockholders’ Equity). In addition, the Company recorded changes in the fair value of equity investments with readily determinable fair values in Net income rather than in Accumulated other comprehensive (loss) income (See Note 12 – Additional Financial Information under the heading “Other, net”). Cost method investments that do not have readily determinable fair values will be recognized prospectively at cost minus impairment, if any, plus or minus changes resulting from observable price changes in orderly transactions for the identical or a similar investment of the same issuer. The adjustments related to the observable price changes will also be recognized in net income.

On July 1, 2018, the Company early adopted ASU 2018-02, “Income Statement—Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income” (“ASU 2018-02”) on a prospective basis using the security-by-security approach. The objective of ASU 2018-02 is to eliminate the stranded tax effects resulting from the Tax Act (as defined below) and to improve the usefulness of information reported to financial statement users. The adoption of ASU 2018-02 resulted in a reclassification from Accumulated other comprehensive (loss) income to Twenty-First Century Fox, Inc. investment related to the income tax effects on the change in the federal statutory rate (See Note 6 – Stockholders’ Equity).

Issued

In February 2016, the FASB issued ASU 2016-02, “Leases (Topic 842)” (“Topic 842”), as amended. Topic 842 requires recognition of lease liabilities and right-of-use assets on the balance sheet and disclosure of key information about leasing arrangements. Topic 842 will be effective for the Company for annual and interim reporting periods beginning July 1, 2019. The Company expects to apply Topic 842 on a modified retrospective basis with the cumulative effect, if any, of initially applying the new guidance recognized at the date of adoption as an adjustment to opening retained earnings. The Company is currently evaluating the impact Topic 842 will have on its consolidated financial statements, including determining which practical expedients to apply. Since the Company has a significant amount of minimum lease commitments (See Note 11 – Commitments and Contingencies in the Form 10), the Company expects that the impact of recognizing operating lease liabilities and right-of-use assets will be significant to the Company’s Consolidated Balance Sheet. The Company is in process of gathering the necessary lease data and implementing accounting lease software for all leases as well as assessing necessary changes to the Company’s processes and controls to support the recognition and disclosure requirements in accordance with the new standard.

In March 2019, the FASB issued ASU 2019-02, “Entertainment—Films—Other Assets—Film Costs (Subtopic 926-20) and Entertainment—Broadcasters—Intangibles—Goodwill and Other (Subtopic 920-350): Improvements to Accounting for Costs of Films and License Agreements for Program Materials” (“ASU 2019-02”). The amendments in ASU 2019-02 align the accounting for production costs of episodic television series with the accounting for production costs of films. In addition, ASU 2019-02 modifies certain aspects of the capitalization, impairment, presentation and disclosure requirements in Accounting Standards Codification (“ASC”) 926-20 and the impairment, presentation and disclosure requirements in ASC 920-350. ASU 2019-02 will be effective for the Company for annual and interim reporting periods beginning July 1, 2020 on a prospective basis. Early adoption is permitted. The Company is currently evaluating the impact ASU 2019-02 will have on its consolidated financial statements.

U.S. Tax Reform

On December 22, 2017, the U.S. government enacted tax legislation commonly referred to as the Tax Cuts and Jobs Act (the “Tax Act”). The Tax Act significantly revises the future ongoing U.S. corporate income tax by, among other things, lowering U.S. corporate income tax rates and implementing a territorial tax system. Effective July 1, 2018, the Company’s corporate income tax rate is 21%.

The SEC issued guidance that allowed for a measurement period of up to one year after the enactment date of the Tax Act to finalize the recording of the related tax impacts. In December 2018, the Company finalized its analysis and has not materially modified the provisional amounts previously recorded in the combined financial statements (See Note 2 – Summary of Significant Accounting Policies in the Form 10 under the heading “U.S. Tax Reform”).

Concentrations of Credit Risk

Cash and cash equivalents are maintained with several financial institutions. The Company has deposits held with banks that exceed the amount of insurance provided on such deposits. Generally, these deposits may be redeemed upon demand and are maintained with financial institutions of reputable credit and, therefore, bear minimal credit risk.

Generally, the Company does not require collateral to secure receivables. As of March 31, 2019, the Company had one customer that accounted for approximately 13% of the Company’s receivables. As of June 30, 2018, the Company had two customers that accounted for approximately 21% of the Company’s receivables.