Additional Financial Information (Components of Other Liabilities) (Details) - USD ($) $ in Millions		Jun. 30, 2019	Jun. 30, 2018
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Accrued non-current pension/postretirement liabilities	[1]	$ 543	$ 244
Other non-current liabilities		356	178
Total other liabilities		$ 899	$ 422

[1] The increase in accrued non-current pension/postretirement liabilities was primarily 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 14—Pension and Other Postretirement Benefits).