Additional Financial Information (Components of Other Non-current Assets) (Details) - USD ($) $ in Millions		Mar. 31, 2020	Jun. 30, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Operating lease ROU assets		$ 531	$ 0
Investments	[1]	347	865
Inventories, net		239	205
Other	[2]	431	455
Total other non-current assets		$ 1,548	$ 1,525

[1] Includes investments accounted for at fair value on a recurring basis of $256 million and $761 million as of March 31, 2020 and June 30, 2019, respectively (See Note 4—Fair Value).

[2] Includes $223 million and $249 million of assets in the Grantor Trust (as defined in Note 14—Pension and Other Postretirement Benefits in the 2019 Form 10-K) as of March 31, 2020 and June 30, 2019, respectively.