Acquisitions, Disposals and Other Transactions - Schedule of Fair Value of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Millions	Jun. 30, 2018	Jun. 30, 2017	Sep. 30, 2016	Jun. 30, 2016	Feb. 29, 2016
Assets acquired:
Goodwill	$ 5,218	$ 3,838		$ 3,714
New Foxtel [Member]
Assets acquired:
Cash	78
Intangible assets	900
Current assets	526
Property, plant and equipment	967
Intangible assets	868
Goodwill	1,574
Other non-current assets	292
Total assets acquired	4,305
Liabilities assumed:
Current liabilities	609
Long-term borrowings	1,751
Other non-current liabilities	405
Total liabilities assumed	2,765
Net assets acquired	$ 1,540
Wireless Group plc [Member]
Assets acquired:
Intangible assets			$ 220
Goodwill			115
Net liabilities			(50)
Liabilities assumed:
Long-term borrowings			23
Net assets acquired			$ 285
iProperty Group Limited [Member] | REA Group [Member]
Assets acquired:
Intangible assets					$ 72
Goodwill					498
Net liabilities					(34)
Liabilities assumed:
Net assets acquired					$ 536