Stockholders' Equity Issuance Of Preferred Shares (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended
	Jul. 31, 2018	Sep. 30, 2019	Dec. 31, 2018
Class of Stock [Line Items]
Preferred Stock, Value, Issued		$ 35	$ 35
Series B Preferred Stock [Member]
Class of Stock [Line Items]
Stock Issued During Period, Shares, New Issues	35,000
Preferred Stock, Value, Issued	$ 35
Preferred Stock, Dividend Rate, Percentage	7.25%
Preferred Stock, Shares Authorized	30,000,000
Preferred Stock, Par or Stated Value Per Share	$ 1