Capital Structure (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended	12 Months Ended
	Jan. 15, 2020	Mar. 31, 2020	Dec. 31, 2019
Debt outstanding:
Preferred stock, par value (in dollars per share)		$ 1	$ 1
Redemption of preferred stock	$ 288	$ 288	$ 0
Redemption price in excess of carrying value	$ 10
Series A Preferred Stock
Debt outstanding:
Stock redeemed (in shares)	11,500
Preferred stock, par value (in dollars per share)	$ 1.00
Liquidation preference per share (in dollars per shares)	$ 25,000