Supplemental share information	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Supplemental share information
Treasury Stock, Shares, Beginning balance	232,055,448	233,433,937	250,489,769
Reacquired stock	31,331,469	10,572,666	254,419
Issuances pursuant to stock options and benefit plans	(14,323,902)	(11,951,155)	(17,310,251)
Treasury Stock, Shares, Ending balance	249,063,015	232,055,448	233,433,937