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Subsequent Events (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	1 Months Ended			12 Months Ended
	Aug. 11, 2023	Sep. 30, 2020	Aug. 31, 2020	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2021
Subsequent Event [Line Items]
Repurchase of common stock				$ 2,000	$ 1,000	$ 1,001
Subsequent Event
Subsequent Event [Line Items]
Repurchase of common stock	$ 50
Class A
Subsequent Event [Line Items]
Cash dividend per share (in USD per share)				$ 0.50	$ 0.48	$ 0.46
Total number of shares repurchased		0.9	4.7
Class A \| Subsequent Event
Subsequent Event [Line Items]
Total number of shares repurchased	1.5
Class B
Subsequent Event [Line Items]
Cash dividend per share (in USD per share)				$ 0.50	$ 0.48	$ 0.46
Total number of shares repurchased		0.4	2.0
Semi Annual Dividend \| Class A \| Subsequent Event
Subsequent Event [Line Items]
Cash dividend per share (in USD per share)	$ 0.26
Semi Annual Dividend \| Class B \| Subsequent Event
Subsequent Event [Line Items]
Cash dividend per share (in USD per share)	$ 0.26