EXHIBIT 11 COMPUTATION OF PRIMARY AND FULLY DILUTED NET INCOME PER COMMON SHARE Three Months Ended June 30 Six Months Ended June 30 ---------------------------- ---------------------------- (Dollars in Millions, Except Per Share Data) 1997 1996 1997 1996 =============================================================================================================================== PRIMARY: Average shares outstanding ....................................... 133,165,814 137,725,350 133,275,817 136,155,737 Net effect of the assumed purchase of stock under the stock option and stock purchase plans--based on the treasury stock method using average market price ...................................... 2,122,587 2,049,153 2,132,334 2,227,166 ---------------------------------------------------------- 135,288,401 139,774,503 135,408,151 138,382,903 ========================================================== Net income ....................................................... $ 178.3 $ 254.1 $ 350.1 $ 430.9 Preferred dividends .............................................. -- (1.6) -- (3.3) ---------------------------------------------------------- Net income applicable to common equity ........................... $ 178.3 $ 252.5 $ 350.1 $ 427.6 ========================================================== Net income per common share ...................................... $ 1.32 $ 1.81 $ 2.59 $ 3.09 ========================================================== FULLY DILUTED: * Average shares outstanding ....................................... 133,165,814 137,725,350 133,275,817 136,155,737 Net effect of the assumed purchase of stock under the stock option and stock purchase plans--based on the treasury stock method using average market price or period-end market price, whichever is higher ....................................................... 2,647,406 2,051,711 2,790,550 2,325,038 Assumed conversion of Series 1991A Preferred Stock ............... -- 3,107,268 -- 3,275,485 ---------------------------------------------------------- 135,813,220 142,884,329 136,066,367 141,756,260 ========================================================== Net income ....................................................... $ 178.3 $ 254.1 $ 350.1 $ 430.9 Preferred dividends, excluding 1991A Preferred Stock ............. -- -- -- -- Net income applicable to common equity ........................... $ 178.3 $ 254.1 $ 350.1 $ 430.9 ========================================================== Net income per common share ...................................... $ 1.31 $ 1.78 $ 2.57 $ 3.04 =============================================================================================================================== *This calculation is submitted in accordance with Regulation S-K item 601(b)(11) although not required by footnote 2 to paragraph 17 of APB Opinion No. 15 because it results in dilution of less than 3%.