Additional Financial Information (Components of Other Non-current Assets) (Details) - USD ($) $ in Millions		Jun. 30, 2020	Jun. 30, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Investments	[1]	$ 618	$ 865
Operating lease ROU assets		539
Grantor Trust assets		247	249
Inventories, net		202	205
Other		195	206
Total other non-current assets		$ 1,801	$ 1,525

[1] Includes investments accounted for at fair value on a recurring basis of $531 million and $761 million as of June 30, 2020 and 2019, respectively (See Note 6—Fair Value).