CONSOLIDATED STATEMENTS OF EQUITY (Parenthetical) - $ / shares	1 Months Ended					12 Months Ended
	Feb. 28, 2019	Feb. 28, 2018	Feb. 28, 2017	Jul. 31, 2016	Feb. 28, 2015	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
CONSOLIDATED STATEMENTS OF EQUITY
Cash dividends per share (in dollars per share)	$ 0.55	$ 0.50	$ 0.45	$ 0.425	$ 0.40	$ 2.00	$ 1.80	$ 1.65