Additional Financial Information (Components of Other Liabilities) (Details) - USD ($) $ in Millions		Mar. 31, 2019	Jun. 30, 2018
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Accrued noncurrent pension/postretirement liabilities	[1]	$ 479	$ 244
Other noncurrent liabilities		384	178
Total other liabilities		$ 863	$ 422

[1] The increase in accrued noncurrent pension/postretirement liabilities was related to the pension and other postretirement benefit assets and liabilities of the Shared Plans allocable to the Company’s employees transferred to the Company (See Note 10 – Pension and Other Postretirement Benefits).