Financial Instruments and Fair Value Measurements - Additional Information (Detail) $ in Millions, $ in Millions	3 Months Ended			6 Months Ended
	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2019 AUD ($)	Jun. 30, 2019 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill carrying value	$ 4,976			$ 4,976			$ 5,147
News America Marketing [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Non-cash impairment charge of goodwill		$ 122
Non-cash impairment charge for indefinite-lived intangible assets		$ 113
Goodwill carrying value	0			0			122
Indefinite-lived intangible assets carrying value	195			195			$ 308
Foreign Exchange 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 gain (loss)	(2)			(2)
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 gain (loss)	2			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 gain (loss)	3			3
Cash Flow Hedging [Member] | Accounting Standards Update 2017-12 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Reclassification of gain from AOCI				5
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	58			58
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	280			280
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						$ 300
Fair Value Hedging [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notional value of derivative	70			70
Fair Value Hedging [Member] | Accounting Standards Update 2017-12 [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	0		$ 0	0	$ 0
Adjustments increased the carrying value of long-term debt	$ 0			$ 0