Earnings Per Share (Computation of Basic and Diluted Earnings Per Share) (Parenthetical) (Details) - shares shares in Millions	12 Months Ended
Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share [Abstract]
Shares utilized for calculation of basic and diluted earnings per share	621	621

Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS).

No definition available.

Name:	us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration