Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 170	$ 921
Other comprehensive income, net of tax
Net unrealized (losses) gains on available-for-sale marketable securities [net of tax benefit (provision) of $7 and ($3), respectively]	(26)	9
Other comprehensive (loss) income	(26)	9
Comprehensive income	$ 144	$ 930