Earnings Per Share (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended		3 Months Ended	9 Months Ended
	Sep. 30, 2018	Jan. 31, 2015	Sep. 30, 2018	Sep. 30, 2018	Sep. 30, 2017	Jan. 12, 2018
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Preferred stock, date dividend declared				Dec. 18, 2017
Preferred stock, date dividend to be paid				Jan. 16, 2018
Preferred stock, common shares issued as stock dividend					10,040,306
Treasury stock acquired, shares	4,829,011
Treasury stock acquired	$ 25		$ 25
Treasury stock acquired, average cost per share	$ 5.18
Common Stock [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Shares issued upon conversion						74,998,614
Depositary Shares [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Shares issued		34,500,000