Description of Business and Basis of presentation (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019	Jun. 30, 2020	Jul. 01, 2019	Jun. 30, 2019
Fiscal period duration		364 days
Operating lease right of use assets		$ 1,191				$ 0
Operating lease liabilities non current		$ 1,249				$ 0
News and Information Services [Member]
Effect of reclassification of expenses	$ 8		$ 23
Digital Real Estate Services [Member]
Effect of reclassification of expenses	$ 1		$ 1
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
Decrease in deferred gain					$ 9