CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Common stock, per share	$ 0.6	$ 0.53	$ 0.52
Preferred stock Series H
Preferred stock, per share	1,275	1,275	1,275
Preferred stock Series I
Preferred stock, per share	1,656.24	1,656.24	1,656.24
Preferred stock Series J
Preferred stock, per share	$ 1,225	$ 1,225	$ 1,225