Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Apr. 01, 2021	Mar. 31, 2021
Allowance for credit losses	$ 7	$ 5		$ 5
Common stock, shares authorized	Unlimited	Unlimited
Common stock, shares issued (in shares)	1,100	1,100	1,100	1,000
Common stock, shares outstanding (in shares)	1,100	1,100	1,100	1,000
Third Parties
Allowance for credit losses	$ 7	$ 5