Condensed Consolidated Statements of Changes in Equity (Parenthetical) - $ / shares		3 Months Ended		6 Months Ended
	May 19, 2017	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Stockholders' Equity [Abstract]
Cash dividends declared per common share (in $ per share)	$ 0.45	$ 0.45	$ 0.45	$ 0.90	$ 0.90
Cash dividends declared per preferred share (in $ per share)	$ 1.8125	$ 1.81	$ 0	$ 3.625	$ 0