Changes in Consolidated Shareholders' Equity (Parenthetical) (Parentheticals) - shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Stockholders' Equity [Abstract]
Common shares issued from treasury stock for stock-based compensation (in shares)	5,126,379	5,590,641	11,139,748
Common shares repurchased (in shares)	30,586,507	27,673,675	0