Investments - Schedule of Losses of Equity Affiliates (Detail) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Schedule of Equity Method Investments [Line Items]
Equity losses of affiliates			$ (47)	$ (17)	$ (1,006)
Impairments of investment	$ 13
Foxtel
Schedule of Equity Method Investments [Line Items]
Equity losses of affiliates			0	$ 0	(974)
Impairments of investment		$ 957
Long-term growth rates				2.00%
Discount rates				10.25%
Foxtel | Equity Losses of Affiliates
Schedule of Equity Method Investments [Line Items]
Amortization of excess basis allocated to finite-lived intangible assets					49
Other Equity Affiliates, Net
Schedule of Equity Method Investments [Line Items]
Equity losses of affiliates			(47)	$ (17)	(32)
Impairments of investment			$ 32		$ 13