Changes in Consolidated Shareholders' Equity (Parenthetical) (Parentheticals) - shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Stockholders' Equity [Abstract]
Common shares issued from treasury stock for stock-based compensation (in shares)	5,590,641	11,139,748	4,164,134
Common shares repurchased (in shares)	27,673,675	0	0