Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Jun. 30, 2018		Jun. 30, 2017		Jun. 30, 2016
Intangible Assets And Goodwill [Line Items]
Impairment charges		$ 280		$ 785		$ 0
Amortization expense of amortizable intangible assets		100		91		$ 91
Finite lived intangible assets, Estimated amortization expense in 2019		120
Finite lived intangible assets, Estimated amortization expense in 2020		112
Finite lived intangible assets, Estimated amortization expense in 2021		108
Finite lived intangible assets, Estimated amortization expense in 2022		103
Finite lived intangible assets, Estimated amortization expense in 2023		97
Non-cash impairment of goodwill and indefinite-lived intangible assets		43		88
Non-cash impairment of goodwill		$ 218	[1]	$ 48	[2]
Other than Impaired Reporting Units [Member]
Intangible Assets And Goodwill [Line Items]
Control premium		10.00%
News America Marketing [Member]
Intangible Assets And Goodwill [Line Items]
Non-cash impairment of goodwill and indefinite-lived intangible assets		$ 165
Royalty rates		2.50%
Non-cash impairment of goodwill	$ 120
FOX SPORTS Australia Reporting Unit [Member]
Intangible Assets And Goodwill [Line Items]
Non-cash impairment of goodwill and indefinite-lived intangible assets	$ 41
Discount rates		9.50%
Non-cash impairment of goodwill		$ 41
Long-term growth rates		2.00%
Minimum [Member] | Other than Impaired Reporting Units [Member]
Intangible Assets And Goodwill [Line Items]
Discount rates		8.50%				9.00%
Long-term growth rates		(0.010)				0.000
Royalty rates		0.50%
Control premium						10.00%
Royalty rates						0.50%
Minimum [Member] | News America Marketing [Member]
Intangible Assets And Goodwill [Line Items]
Discount rates		12.50%
Long-term growth rates		0.019
Minimum [Member] | Other than Impaired Reporting Units [Member]
Intangible Assets And Goodwill [Line Items]
Discount rates				9.00%
Long-term growth rates				0.000
Control premium				10.00%
Royalty rates				0.50%
Maximum [Member] | Other than Impaired Reporting Units [Member]
Intangible Assets And Goodwill [Line Items]
Discount rates		25.00%				14.50%
Long-term growth rates		0.030				0.035
Royalty rates		7.50%
Control premium						15.00%
Royalty rates						3.40%
Maximum [Member] | News America Marketing [Member]
Intangible Assets And Goodwill [Line Items]
Discount rates		14.00%
Long-term growth rates		0.009
Maximum [Member] | Other than Impaired Reporting Units [Member]
Intangible Assets And Goodwill [Line Items]
Discount rates				25.00%
Long-term growth rates				0.033
Control premium				15.00%
Royalty rates				7.50%
News and Information Services [Member]
Intangible Assets And Goodwill [Line Items]
Accumulated impairment loss, goodwill		$ 3,600
Non-cash impairment of goodwill		158	[1]	$ 20	[2]
Trademarks and Tradenames [Member]
Intangible Assets And Goodwill [Line Items]
Impairment charges		$ 50		$ 58

[1] In the News and Information Services segment, the write-down of goodwill primarily relates to the News America Marketing reporting unit, and in the Subscription Video Services segment the write-down primarily relates to the FOX SPORTS Australia reporting unit. In the Digital Real Estate Services segment, the write-down of goodwill relates to the Company's DIAKRIT reporting unit.

[2] In the News and Information Services segment, the write-down of goodwill primarily relates to a reporting unit in the U.K. In the Digital Real Estate Services segment, the write-down of goodwill relates to the Company's DIAKRIT reporting unit.