Additional Financial Information (Components of Other Non-current Assets) (Details) - USD ($) $ in Millions		Dec. 31, 2018	Jun. 30, 2018
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Investments	[1]	$ 289	$ 275
Inventories, net		155	121
Other	[2]	389	363
Total other non-current assets		$ 833	$ 759

[1] Includes an investment with a readily determinable fair value of $185 million and $257 million as of December 31, 2018 and June 30, 2018, respectively (See Note 4 - Fair Value). See Note 2 - Acquisitions, Disposals and Other Transactions for information on recent investments.

[2] Other includes $230 million and $265 million as of December 31, 2018 and June 30, 2018, respectively, related to the Trust (as defined in Note 12 - Pension and Other Postretirement Benefits in the Form 10).