Exhibit 11 Diluted Earnings Per Common Share and Diluted Average Common Shares Outstanding For diluted earnings per common share, net income available to common shareholders can be affected by the conversion of the registrant's convertible preferred stock. Where the effect of this conversion would have been dilutive, net income available to common shareholders is adjusted by the associated preferred dividends. This adjusted net income is divided by the weighted average number of common shares outstanding for each period plus amounts representing the dilutive effect of stock options outstanding and the dilution resulting from the conversion of the registrant's convertible preferred stock, if applicable. The effect of convertible preferred stock is excluded from the computation of diluted earnings per common share in periods in which the effect would be antidilutive. Diluted earnings per common share was determined as follows (shares in thousands, dollars in millions except per-share information):
Three Months Ended Six Months Ended June 30 June 30 ------------------------ ------------------------ 1998 1997 1998 1997 -------- -------- -------- -------- Average common shares outstanding .................................. 958,392 946,462 954,040 945,826 Dilutive effect of Convertible preferred stock ............................. 3,123 3,948 3,123 3,948 Stock options ........................................... 20,820 26,043 20,869 26,993 -------- -------- -------- -------- Total dilutive shares .............................................. 982,335 976,453 978,032 976,767 ======== ======== ======== ======== Income available to common shareholders ............................ $ 1,407 $ 916 $ 1,902 $ 1,767 Preferred dividends paid on dilutive convertible preferred stock ........................................ 1 2 3 4 -------- -------- -------- -------- Total net income available for common shareholders adjusted for full dilution ............................. $ 1,408 $ 918 $ 1,905 $ 1,771 ======== ======== ======== ======== Diluted earnings per common share .................................. $ 1.43 $ .94 $ 1.95 $ 1.81 ======== ======== ======== ========
45