Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Long-term debt, fair value	$ 392	$ 382
Preferred Stock
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	50,000,000	50,000,000
Preferred stock, shares issued	0	0
Common Series A
Common Stock
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	160,000,000	160,000,000
Common stock, shares issued	54,496,831	54,496,214
Common stock, shares outstanding	54,496,831	54,496,214
Common Series B
Common Stock
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	6,000,000	6,000,000
Common stock, shares issued	2,830,174	2,830,174
Common stock, shares outstanding	2,830,174	2,830,174