Supplemental Share Information - shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Supplemental Share Information Treasury Stock
Treasury Stock, Shares, Beginning Balance	368,848,221	367,457,888	349,148,819
Reacquired stock	2,286,109	7,575,647	23,526,293
Issuances pursuant to stock options and benefit plans	(4,850,912)	(6,185,314)	(5,217,224)
Treasury Stock, Shares, Ending Balance	366,283,418	368,848,221	367,457,888