Income Taxes - Change in Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Income Tax Disclosure [Abstract]
Balance at beginning of the year	$ 22	$ 15	$ 19
Increases related to positions taken during the current year	2	1	1
Increases recorded in current year related to positions taken during prior years	19	6	2
Expirations due to lapse of statute	0	0	(7)
Balance at end of year	$ 43	$ 22	$ 15