2.2.0.25falsefalse110 - Disclosure - Per Common Share Informationtruefalsefalse1falsefalseUSDfalsefalse1/1/2011 - 3/31/2011 USD ($) USD ($) / shares $eol_PE2163----1110-Q0003_STD_90_20110331_0http://www.sec.gov/CIK0000063908duration2011-01-01T00:00:002011-03-31T00:00:00iso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170iso4217_USD_per_sharesDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instanceshares0sharesStandardhttp://www.xbrl.org/2003/instanceshares0USDUSD$5false0us-gaap_EarningsPerShareTextBlockus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<div> <p style="MARGIN-TOP: 18px; MARGIN-BOTTOM: 0px"><font style="FONT-FAMILY: Times New Roman" size="2"><b>Per Common Share Information</b></font></p> <p style="MARGIN-TOP: 6px; TEXT-INDENT: 4%; MARGIN-BOTTOM: 0px"> <font style="FONT-FAMILY: Times New Roman" size="2">Diluted earnings per common share is calculated using net income divided by diluted weighted-average shares. Diluted weighted-average shares include weighted-average shares outstanding plus the dilutive effect of share-based compensation calculated using the treasury stock method, of 12.2&#xA0;million shares and 14.1&#xA0;million shares for the first quarter 2011 and 2010, respectively. Stock options that were not included in diluted weighted-average shares because they would have been antidilutive were 3.9&#xA0;million shares for the first quarter 2011 and none for the first quarter 2010.</font></p> </div>Per Common Share Information Diluted earnings per common share is calculated using net income divided by diluted weighted-average shares. DilutedfalsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringThis element may be used to capture the complete disclosure pertaining to an entity's earnings per share.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 falsefalse11Per Common Share InformationUnKnownUnKnownUnKnownUnKnownfalsetrue