Income Taxes (Uncertain Tax Positions) (Parenthetical) (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Income Tax Disclosure [Abstract]
Reduction for prior year tax positions from the expiration of statutes of limitations	$ 14	$ 21
Reduction for prior year tax positions from the settlement of audits	$ 31