Series A Convertible Preferred Stock (Details) - Series A Convertible Preferred Stock - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Class of Stock [Line Items]
Dividend rate	5.50%		5.50%
Dividend rate for preferred shares; accrued but unpaid dividend	8.00%		8.00%
Cash dividends paid	$ 4	$ 4	$ 8	$ 8
Conversion price per share at option of holder (in dollars per share)	$ 30.00		$ 30.00
Conversion rate per preferred share (in shares)			33.333
Financial instruments subject to redemption, settlement terms, maximum number of shares (in shares)	9,200,000		9,200,000		9,200,000