Consolidated Statements Of Stockholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
TREASURY STOCK, AT COST:
Purchases, shares	5,850,000	0	1,380,000
RETAINED EARNINGS:
Cash dividends declared on common stock, per share	$ 3.09	$ 2.19	$ 1.56