Investments - Schedule of Total Gains and Losses on Equity Securities (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Schedule of Investments [Abstract]
Total losses recognized on equity securities	$ (1)	$ (2)	$ (11)	$ (16)
Less: Net gains recognized on equity securities sold	0	0	0	2
Unrealized losses recognized on equity securities held at end of period	$ (1)	$ (2)	$ (11)	$ (18)