Consolidated Statements of Equity (Parenthetical) - $ / shares													12 Months Ended
	Nov. 02, 2016	Aug. 04, 2016	May 09, 2016	Feb. 25, 2016	Nov. 05, 2015	Aug. 04, 2015	May 05, 2015	Feb. 25, 2015	Nov. 05, 2014	Aug. 06, 2014	May 06, 2014	Feb. 24, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Consolidated Statements of Equity
Dividends declared per common share (in dollars per share)	$ 0.48	$ 0.48	$ 0.48	$ 0.48	$ 0.48	$ 0.48	$ 0.48	$ 0.48	$ 0.48	$ 0.48	$ 0.48	$ 0.48	$ 1.92	$ 1.92	$ 1.92