CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY Unaudited (Parenthetical) - $ / shares	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Common stock, per share	$ 0.34	$ 0.28
Preferred stock Series H
Preferred stock, per share	637.5	637.5
Preferred stock Series I
Preferred stock, per share	828.12	828.12
Preferred stock Series J
Preferred stock, per share	$ 612.5	$ 612.5