Statement of Changes in Consolidated Equity (Parenthetical) - $ / shares	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Common Stock, dividends declared per share (usd per share)	$ 0.06	$ 0.24	$ 0.36	$ 0.12
Preferred Class A
Preferred, dividends per share (usd per share)		3.75	3.75	3.75
Preferred Class B
Preferred, dividends per share (usd per share)		$ 20.1563	$ 26.875	$ 26.8750