Acquisitions, Disposals and Other Transactions - Additional Information (Detail) £ / shares in Units, € in Millions, £ in Millions, $ in Millions					1 Months Ended											3 Months Ended		12 Months Ended
		Jul. 31, 2017 USD ($)	Jul. 31, 2017 AUD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2018 AUD ($)	Apr. 30, 2018	Jul. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2016 EUR (€)	Sep. 30, 2016 USD ($)	Sep. 30, 2016 GBP (£) £ / shares	Feb. 29, 2016 USD ($)	Feb. 29, 2016 AUD ($)	Sep. 30, 2015 GBP (£)	Sep. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)	Jun. 30, 2018 USD ($)		Jun. 30, 2017 USD ($)		Jun. 30, 2016 USD ($)		Jun. 30, 2018 AUD ($)	Jan. 31, 2016	Sep. 30, 2015 GBP (£)
Schedule Of Business Acquisitions And Divestitures [Line Items]
Long term debt					$ 1,952,000,000													$ 1,952,000,000		$ 379,000,000
Goodwill					5,218,000,000													5,218,000,000		3,838,000,000		$ 3,714,000,000
Loss on transactions	[1]																	(337,000,000)		0		0
Business acquisition purchase price allocation, goodwill amount																		1,699,000,000	[2]	159,000,000
Foxtel and Fox Sports Australia [Member]
Schedule Of Business Acquisitions And Divestitures [Line Items]
Loss on transactions																		(337,000,000)
Write-off of channel distribution agreement intangible asset																		317,000,000
REA Group [Member]
Schedule Of Business Acquisitions And Divestitures [Line Items]
Company ownership percentage									61.60%	61.60%
Cash consideration of sale of business									$ 140,000,000	€ 133
Gain on sale of business																	$ 120,000,000	0	[3]	107,000,000	[3]	0	[3]
Smartline Home Loans Pty Limited [Member]
Schedule Of Business Acquisitions And Divestitures [Line Items]
Business acquisition, cost of acquired entity, cash paid		$ 55,000,000	$ 70
Goodwill		$ 49,000,000						$ 49,000,000
Business acquisition, acquired interest percentage		80.30%						80.30%
Non-controlling ownership percentage		19.70%						19.70%
Starting period to sell remaining interest in minority shareholders																After three years
Mandatorily redeemable period after closing, if option is not exercised																4 years
Minority interest value																$ 12,000,000
Smartline Home Loans Pty Limited [Member] | Customer Relationships [Member]
Schedule Of Business Acquisitions And Divestitures [Line Items]
Business acquisition purchase price allocation, amortizable and indefinite lived intangible assets		$ 19,000,000						$ 19,000,000
Finite lived intangible assets, weighted average useful life								16 years
Wireless Group plc [Member]
Schedule Of Business Acquisitions And Divestitures [Line Items]
Business acquisition, cost of acquired entity, cash paid											$ 285,000,000	£ 220
Business acquisition purchase price allocation, amortizable and indefinite lived intangible assets											220,000,000
Goodwill											115,000,000
Assumed debt											23,000,000
Business acquisition, cost of acquired entity per share | £ / shares												£ 3.15
Restricted cash					0													$ 0		0
Wireless Group plc [Member] | Broadcast Licenses [Member]
Schedule Of Business Acquisitions And Divestitures [Line Items]
Business acquisition purchase price allocation, intangible assets											185,000,000
Wireless Group plc [Member] | Trademarks [Member]
Schedule Of Business Acquisitions And Divestitures [Line Items]
Business acquisition purchase price allocation, intangible assets											27,000,000
Wireless Group plc [Member] | Customer Relationships [Member]
Schedule Of Business Acquisitions And Divestitures [Line Items]
Business acquisition purchase price allocation, amortizable and indefinite lived intangible assets											$ 8,000,000
Finite lived intangible assets, weighted average useful life											6 years	6 years
Unruly Holdings Limited [Member]
Schedule Of Business Acquisitions And Divestitures [Line Items]
Business acquisition, cost of acquired entity, cash paid				$ 90,000,000											£ 60
Future cash consideration related to contingent payments				86,000,000																						£ 56
Future consideration related to contingent payments				40,000,000
Business acquisition purchase price allocation, goodwill amount				68,000,000
Unruly Holdings Limited [Member] | Acquired Technology [Member]
Schedule Of Business Acquisitions And Divestitures [Line Items]
Business acquisition purchase price allocation, amortizable and indefinite lived intangible assets				$ 43,000,000
Finite lived intangible assets, weighted average useful life				7 years
Unruly Holdings Limited [Member] | Customer Relationships and Trade Names [Member]
Schedule Of Business Acquisitions And Divestitures [Line Items]
Business acquisition purchase price allocation, amortizable and indefinite lived intangible assets				$ 21,000,000
Finite lived intangible assets, weighted average useful life				6 years
iProperty Group Limited [Member] | REA Group [Member]
Schedule Of Business Acquisitions And Divestitures [Line Items]
Business acquisition, cost of acquired entity, cash paid													$ 340,000,000	$ 482
Business acquisition purchase price allocation, amortizable and indefinite lived intangible assets													72,000,000
Goodwill													$ 498,000,000
Non-controlling ownership percentage													13.10%
Minority interest value													$ 76,000,000
Business combination, ownership percentage prior to acquisition date																									22.70%
Business acquisition, ownership percentage													86.90%
Minority interest ownership redeemable year																		2018
iProperty Group Limited [Member] | REA Group [Member] | Other, Net [Member]
Schedule Of Business Acquisitions And Divestitures [Line Items]
Business acquisition recognized gain resulting from remeasurement of previously held equity interest																						29,000,000
Hometrack Australia Pty Ltd [Member]
Schedule Of Business Acquisitions And Divestitures [Line Items]
Business acquisition, cost of acquired entity, cash paid					100,000,000	$ 130
Long term debt					53,000,000													$ 53,000,000						$ 70
Business acquisition purchase price allocation, amortizable and indefinite lived intangible assets					25,000,000													25,000,000
Goodwill					74,000,000													$ 74,000,000
Hometrack Australia Pty Ltd [Member] | Customer Relationships [Member]
Schedule Of Business Acquisitions And Divestitures [Line Items]
Finite lived intangible assets, weighted average useful life																		15 years
Hometrack Australia Pty Ltd [Member] | Technology [Member]
Schedule Of Business Acquisitions And Divestitures [Line Items]
Finite lived intangible assets, weighted average useful life																		8 years
New Foxtel [Member]
Schedule Of Business Acquisitions And Divestitures [Line Items]
Business acquisition purchase price allocation, amortizable and indefinite lived intangible assets					900,000,000													$ 900,000,000
Goodwill					1,574,000,000													$ 1,574,000,000
Percentage of the entity that the excess purchase price valuation is based on																		100.00%
Business acquisition purchase price allocation, tangible assets					849,000,000													$ 849,000,000
Assumed debt					1,751,000,000													1,751,000,000
Minority interest value	[4]				$ 578,000,000													$ 578,000,000
New Foxtel [Member] | Foxtel and Fox Sports Australia [Member]
Schedule Of Business Acquisitions And Divestitures [Line Items]
Equity method investment, ownership percentage							50.00%
Company ownership percentage							100.00%											65.00%
New Foxtel [Member] | Telstra [Member] | Foxtel and Fox Sports Australia [Member]
Schedule Of Business Acquisitions And Divestitures [Line Items]
Ownership interest held by minority interest					35.00%													35.00%						35.00%
New Foxtel [Member] | FOX SPORTS Australia [Member]
Schedule Of Business Acquisitions And Divestitures [Line Items]
Business acquisition, acquired interest percentage					65.00%													65.00%						65.00%
New Foxtel [Member] | Customer Relationships [Member]
Schedule Of Business Acquisitions And Divestitures [Line Items]
Business acquisition purchase price allocation, amortizable and indefinite lived intangible assets					$ 123,000,000													$ 123,000,000
Finite lived intangible assets, weighted average useful life																		15 years
New Foxtel [Member] | Subscriber Relationships [Member]
Schedule Of Business Acquisitions And Divestitures [Line Items]
Business acquisition purchase price allocation, amortizable and indefinite lived intangible assets					468,000,000													$ 468,000,000
Finite lived intangible assets, weighted average useful life																		10 years
New Foxtel [Member] | Foxtel Tradename [Member]
Schedule Of Business Acquisitions And Divestitures [Line Items]
Business acquisition purchase price allocation, amortizable and indefinite lived intangible assets					$ 277,000,000													$ 277,000,000
Australian Regional Media [Member]
Schedule Of Business Acquisitions And Divestitures [Line Items]
Business acquisition, cost of acquired entity, cash paid																				$ 62,000,000
DIAKRIT, Flatmates, Checkout 51 [Member]
Schedule Of Business Acquisitions And Divestitures [Line Items]
Business acquisition, cost of acquired entity, cash paid																						$ 90,000,000

[1] See Note 3-Acquisitions, Disposals and Other Transactions.

[2] Primarily relates to the Transaction in the Subscription Video Services segment and the acquisition of Smartline and Hometrack in the Digital Real Estate Services segment.

[3] The Company recognized a pre-tax gain of $107 million for the fiscal year ended June 30, 2017 related to REA Group's sale of its European business. See Note 3-Acquisitions, Disposals and Other Transactions.

[4] Primarily represents the fair value of 35% of Foxtel, which includes the impact of certain market participant synergies