Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Millions			12 Months Ended
		Nov. 20, 2017	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Loss Contingencies [Line Items]
Net benefit liability recognized for pension and other postretirement benefit plans			$ 725
U.K. Newspaper Matters Indemnity
Loss Contingencies [Line Items]
Liability related to indemnity			65	$ 50
Shareholder Litigation
Loss Contingencies [Line Items]
Litigation settlement expense		$ 22
Settlement amount to be received from insurer		$ 90
Settlement amount, net of attorneys' fees and expenses	[1]		0	$ 0	$ 68
Profits Participants Litigation
Loss Contingencies [Line Items]
Litigation settlement expense			$ 58

[1] See Note 14—Commitments and Contingencies under the heading “Shareholder Litigation.”