Additional Financial Information (Components of Other Liabilities) (Details) - USD ($) $ in Millions		Dec. 31, 2018	Jun. 30, 2018
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Accrued noncurrent pension liabilities	[1]	$ 377	$ 244
Other noncurrent liabilities		230	178
Total other liabilities		$ 607	$ 422

[1] The increase in accrued noncurrent pension liabilities was related to the pension benefit assets and liabilities of the Shared Plans allocable to the Company’s employees transferred to the Company during the second quarter of fiscal 2019 (See Note 10 - Pension and Other Postretirement Benefits).