Earnings Per Share (Computation of Basic and Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended																12 Months Ended
		Jun. 30, 2020		Mar. 31, 2020		Dec. 31, 2019		Sep. 30, 2019		Jun. 30, 2019	[1]	Mar. 31, 2019	[1]	Dec. 31, 2018	[1]	Sep. 30, 2018	[1]	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share [Abstract]
Net income attributable to Fox Corporation stockholders		$ 122	[1]	$ 78	[1]	$ 300	[1]	$ 499	[1]	$ 454		$ 529		$ 8		$ 604		$ 999	$ 1,595	$ 2,187
Weighted average shares - basic	[2]																	613	621	621
Shares issuable under equity-based compensation plans	[3]																	3	0	0
Weighted average shares - diluted	[2]																	616	621	621
Net income attributable to Fox Corporation stockholders per share - basic		$ 0.20		$ 0.13		$ 0.49		$ 0.80										$ 1.63	$ 2.57	$ 3.52
Net income attributable to Fox Corporation stockholders per share - diluted		$ 0.20		$ 0.13		$ 0.48		$ 0.80										$ 1.62	$ 2.57	$ 3.52

[1] See Note 5—Inventories, net and Note 21—Additional Financial Information under the heading “Other, net” for details of infrequent items recorded during the fiscal year. In addition, the Company recorded impairment and restructuring charges of $442 million, or $0.73 per basic and diluted share, during the fourth quarter of fiscal 2020 (See Note 4—Restructuring Programs for additional information).

[2] ^{For all periods presented that ended prior to the date of the Distribution, 621 million shares have been utilized for the calculation of basic and diluted earnings per share as no shares of common stock or equity-based awards of the Company were outstanding prior to that date (See Note 2—Summary of Significant Accounting Policies under the heading “Earnings per share” for additional information).}

[3] ^{Weighted average common shares include the incremental shares that would be issued upon the assumed vesting of RSUs, PSUs and stock options if the effect is dilutive (See Note 12—Equity-Based Compensation).}