Stockholders' Equity (Summary of Repurchases of Common Stock) (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
Jun. 30, 2021	Jun. 30, 2020
Stockholders Equity [Line Items]
Total cost of repurchases	$ 1,001	$ 600
Class A and Class B Common Stock
Stockholders Equity [Line Items]
Total cost of repurchases	$ 1,001	$ 600
Total number of shares repurchased	32	17

Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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Balance Type:	debit
Period Type:	duration