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Acquisitions, Disposals and Other Transactions - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended		3 Months Ended
	Oct. 31, 2018	Apr. 30, 2018	Jun. 30, 2018	Dec. 31, 2018
Schedule Of Business Acquisitions And Divestitures [Line Items]
Goodwill			$ 5,218	$ 5,225
New Foxtel [Member]
Schedule Of Business Acquisitions And Divestitures [Line Items]
Cash acquired		$ 78
Goodwill		$ 1,574
Ownership interest		65.00%
Business acquisition, acquired interest percentage		65.00%
Percentage of the entity that the excess purchase price valuation is based on		100.00%
Business acquisition purchase price allocation, tangible assets		$ 849
Business acquisition purchase price allocation, Outstanding borrowings		1,751
Business acquisition purchase price allocation, amortizable and indefinite-lived intangible assets		868
Business Assets Acquired		$ 4,305
Opcity [Member]
Schedule Of Business Acquisitions And Divestitures [Line Items]
Total transaction value	$ 210
Payment to acquire business	182
Cash acquired	7
Compensation expense	28
Cash held back after closing	$ 20
Acquisition cost recognized as compensation expense, period for recognition	3 years
Goodwill	$ 124
Business Assets Acquired	$ 73
Opcity [Member] \| Purchased technology
Schedule Of Business Acquisitions And Divestitures [Line Items]
Purchased technology, weighted average useful life	12 years
Business acquisition, purchased technology amount	$ 49
Opcity [Member] \| Leads and Customer Relationships [Member]
Schedule Of Business Acquisitions And Divestitures [Line Items]
Business acquisition purchase price allocation, amortizable intangible assets	$ 24
Finite lived intangible assets, weighted average useful life	9 years
Foxtel [Member]
Schedule Of Business Acquisitions And Divestitures [Line Items]
Equity method investment, ownership percentage		50.00%
FOX SPORTS Australia [Member]
Schedule Of Business Acquisitions And Divestitures [Line Items]
Company ownership percentage		100.00%
Write-off of channel distribution agreement intangible asset			317
FOX SPORTS Australia [Member] \| Nonoperating Income (Expense) [Member]
Schedule Of Business Acquisitions And Divestitures [Line Items]
Loss on transactions			$ (337)
FOX SPORTS Australia [Member] \| New Foxtel [Member]
Schedule Of Business Acquisitions And Divestitures [Line Items]
Company ownership percentage		65.00%
Subscriber Relationships [Member] \| New Foxtel [Member]
Schedule Of Business Acquisitions And Divestitures [Line Items]
Business acquisition purchase price allocation, amortizable intangible assets		$ 468
Finite lived intangible assets, weighted average useful life		10 years
Trade Names [Member] \| New Foxtel [Member]
Schedule Of Business Acquisitions And Divestitures [Line Items]
Business acquisition purchase price allocation, indefinite-lived intangible assets		$ 277
Customer Relationships [Member] \| New Foxtel [Member]
Schedule Of Business Acquisitions And Divestitures [Line Items]
Finite lived intangible assets, weighted average useful life		15 years
Business acquisition purchase price allocation, amortizable and indefinite-lived intangible assets		$ 123
Telstra [Member] \| New Foxtel [Member]
Schedule Of Business Acquisitions And Divestitures [Line Items]
Ownership interest held by minority interest		35.00%