Preferred stock (Tables)

12 Months Ended

Mar. 31, 2020

Preferred stock

Schedule of Stock by Class

The composition of preferred stock at March 31, 2018, 2019 and 2020 is as follows:

	March 31, 2018				March 31, 2019				March 31, 2020
Class of stock	Authorized		Issued		Authorized		Issued		Authorized		Issued
	(number of shares)
Class XIV preferred stock		900,000,000		—		900,000,000		—		900,000,000		—
Class XV preferred stock		900,000,000		—		900,000,000		—		900,000,000		—
Class XVI preferred stock		1,500,000,000		—		1,500,000,000		—		1,500,000,000		—