Investments - Schedule of Total Gains and Losses on Equity Securities (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Schedule of Investments [Abstract]
Total gains (losses) recognized on equity securities	$ 13	$ (11)	$ (10)	$ (14)
Less: Net gains recognized on equity securities sold	0	2	0	2
Unrealized gains (losses) recognized on equity securities held at end of period	$ 13	$ (13)	$ (10)	$ (16)