Income Taxes - Change in Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Income Tax Disclosure [Abstract]
Balance at beginning of the year	$ 15	$ 19	$ 7
Increases related to positions taken during the current year	1	1	12
Increases recorded in current year related to positions taken during prior years	6	2	0
Expirations due to lapse of statute	0	(7)	0
Balance at end of year	$ 22	$ 15	$ 19