Stockholders' Equity (Details) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Sep. 30, 2021 USD ($) financial_institution	Mar. 31, 2020 $ / shares shares
Subsidiary, Sale of Stock [Line Items]
Sale of stock, number of participating financial institutions | financial_institution	6
Stock issued during period (in shares)		1.7
Stock redeemed during period (in shares)		1.7
Preferred stock, par value (in usd per share) | $ / shares		$ 1
ATM Program | Maximum
Subsidiary, Sale of Stock [Line Items]
Sale of stock, consideration received on transaction | $	$ 500