Additional Financial Information (Components of Other Non-current Assets) (Details) - USD ($) $ in Millions		Jun. 30, 2021	Jun. 30, 2020
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Investments	[1]	$ 899	$ 618
Operating lease ROU assets		469	539
Grantor Trust		304	247
Inventories, net		199	202
Other		187	195
Total other non-current assets		$ 2,058	$ 1,801

[1] Includes investments accounted for at fair value on a recurring basis of $788 million and $531 million as of June 30, 2021 and 2020, respectively (See Note 6—Fair Value).