Financial Instruments and Fair Value Measurements - Additional Information (Detail) $ in Millions, $ in Millions	3 Months Ended						12 Months Ended
	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 AUD ($)	Dec. 31, 2018 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)
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	$ 2						$ 2
Non-cash impairment of goodwill						$ 41	1,098	$ 49
Goodwill carrying value	3,951						3,951	5,147			$ 5,218
Indefinite-lived intangible assets carrying value	947						947	1,358
Equity method investment carrying value	120						120	148
Non-cash impairments of equity method investment			$ 13
News America Marketing
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Non-cash impairment of goodwill				$ 122		120
Non-cash impairment charge for indefinite-lived intangible assets				113		45
Goodwill carrying value				0		181		122				$ 301
Indefinite-lived intangible assets carrying value				$ 195		346		$ 308				391
Fox Sports Australia Reporting Unit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill carrying value						$ 449						$ 490
News UK and News Corp Australia
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed-asset impairment charges	203
News Corp Australia
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Property, plant, and equipment	235						235
News Corp UK [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Property, plant, and equipment	207						207
Foxtel
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Non-cash impairment of goodwill		$ 882
Non-cash impairment charge for indefinite-lived intangible assets		49
Goodwill carrying value		786								$ 1,668
Indefinite-lived intangible assets carrying value		$ 140	$ 189
Equity method investment carrying value					$ 631					$ 1,588
Non-cash impairments of equity method investment					$ 957
Cross Currency Interest Rate Derivatives
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						2
Interest Rate Swap
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	3						3
Cash Flow Hedging | Accounting Standards Update 2017-12
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Reclassification of gain from AOCI							5
Cash Flow Hedging | Foreign Exchange Contract
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notional value of derivative	53						53
Cash Flow Hedging | Cross Currency Interest Rate Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notional value of derivative	280						280
Cash Flow Hedging | Interest Rate Contract
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notional value of derivative									$ 300
Fair Value Hedging
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notional value of derivative									$ 70
Cumulative hedging adjustments included in the carrying amount	$ 3						$ 3