CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) - $ / shares							3 Months Ended		9 Months Ended
	Sep. 10, 2019	Jun. 11, 2019	Mar. 12, 2019	Dec. 12, 2018	Sep. 11, 2018	Jun. 12, 2018	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Stockholders' Equity
Dividends declared per share of common stock	$ 0.40	$ 0.40	$ 0.40	$ 0.40	$ 0.40	$ 0.40	$ 0.40	$ 0.40	$ 1.20	$ 1.17