Investments - Schedule of Total Gains and Losses on Equity Securities (Detail) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2020
Schedule of Investments [Abstract]
Total (losses) gains recognized on equity securities	$ (59)	$ 81	$ (21)
Less: Net losses recognized on equity securities sold or impaired	0	(1)	0
Unrealized (losses) gains recognized on equity securities held at end of period	$ (59)	$ 82	$ (21)