Additional Financial Information (Components of Other Non-current Assets) (Details) - USD ($) $ in Millions		Dec. 31, 2019	Jun. 30, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Investments	[1]	$ 1,228	$ 865
Operating lease ROU assets		533	0
Inventories, net		198	205
Other	[2]	463	455
Total other non-current assets		$ 2,422	$ 1,525

[1] Includes investments accounted for at fair value on a recurring basis of $1.1 billion and $761 million as of December 31, 2019 and June 30, 2019, respectively (See Note 4—Fair Value).

[2] Includes $253 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 December 31, 2019 and June 30, 2019, respectively.