Description of Business and Basis of presentation (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2018	Jun. 30, 2020	Jun. 30, 2019	Sep. 30, 2019	Jul. 01, 2019
Fiscal period duration			364 days
Operating lease right of use assets				$ 1,290
Decrease in deferred gain					$ 9
Operating lease liabilities non current				$ 1,329
News and Information Services [Member]
Effect of reclassification of expenses	$ 7
Scenario, Forecast [Member]
Fiscal period duration		364 days
Accounting Standards Update 2016-02 [Member]
Operating lease right of use assets					1,400
Operating lease liabilities,current					200
Operating lease liabilities non current					$ 1,400