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Financial Instruments and Fair Value Measurements - Additional Information (Detail) $ in Millions, $ in Millions	3 Months Ended				12 Months Ended
	Dec. 31, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2019 AUD ($)	Mar. 31, 2019 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimates of net derivative gains related to cash flow hedges included in Accumulated other comprehensive loss					$ 1
Equity method investment carrying value				$ 1,432	148	$ 173	$ 1,205
Non-cash impairments of equity method investment	$ 13		$ 227
Non-cash impairment charge of goodwill		$ 41			49	218	48
Goodwill carrying value					5,147	5,218	3,838
Indefinite-lived intangible assets carrying value					1,358	1,474
Fixed-asset impairment charges							679
Non-cash impairment charge					96	280	785
News America Marketing [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Non-cash impairment charge of goodwill		120
Non-cash impairment charge for indefinite-lived intangible assets		45
Goodwill carrying value			301						$ 181
Indefinite-lived intangible assets carrying value		346	391
Fox Sports Australia Reporting Unit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Non-cash impairment charge of goodwill		41
Goodwill carrying value		449	490
United Kingdom Newspapers [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed assets carrying value subsequent to recognizing non-cash impairment charges							371
Non-cash impairment charge							360
Fixed assets carrying value prior to recognizing non-cash impairment charges							$ 731
News Corp Australia [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed assets carrying value subsequent to recognizing non-cash impairment charges				375
Fixed-asset impairment charges				310
Fixed assets carrying value of intangible assets prior to recognizing non-cash impairment charges				48
Fixed assets carrying value prior to recognizing non-cash impairment charges				667
Fixed assets carrying value of intangible assets subsequent to recognizing non-cash impairment charges				$ 30
Foxtel [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity method investment carrying value		631	1,588
Non-cash impairments of equity method investment		$ 957	$ 227
Cross Currency Interest Rate Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimates of net derivative gains related to cash flow hedges included in Accumulated other comprehensive loss					2
Interest Rate Swap [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimates of net derivative gains related to cash flow hedges included in Accumulated other comprehensive loss					5
Cash Flow Hedging [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amount recognized in earnings for ineffective portion of derivative instruments designated as cash flow hedges					4	$ 0
Cash Flow Hedging [Member] \| Foreign Exchange Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notional value of derivative					9
Cash Flow Hedging [Member] \| Cross Currency Interest Rate Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notional value of derivative								$ 400
Cash Flow Hedging [Member] \| Interest Rate Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notional value of derivative								700
Fair Value Hedging [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notional value of derivative								$ 100
Adjustments increased the carrying value of long-term debt					4
Not Designated as Hedging Instrument, Economic Hedge [Member] \| Cross Currency Interest Rate Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notional value of derivative					$ 75