Exhibit 11
                                                                  -------------
                                                                   (Page 1 of 2)

                 MCI COMMUNICATIONS CORPORATION AND SUBSIDIARIES
                    COMPUTATION OF EARNINGS PER COMMON SHARE
                     (In millions, except per share amounts)
                                   (unaudited)

                                             Three months        Nine months
                                                ended                ended
                                             September 30,        September 30,
                                             -------------        -------------
                                               1997   1996         1997    1996
 Primary                                       ----   ----         ----    ----
 -------
Net income (loss)                             $(182)  $304         $393    $899
                                               ====   ====         ====    ====
Adjustment of shares outstanding:
  Weighted average shares of common stock
   outstanding                                  695    685          690     688
  Shares of common stock issuable upon the
    assumed exercise of common stock
    equivalents                                   -     42           69      57
  Shares of common stock assumed repurchased
    for treasury(a)                               -    (36)         (54)    (50)
                                               ----   ----         ----    ----
  Adjusted shares of common stock and common
    stock equivalents for computation           695    691          705     695
                                               ====   ====         ====    ====
Earnings (loss) per common and common
  equivalent shares                           $(.26)  $.44         $.56   $1.29
                                               ====   ====         ====    ====


(a) Loss per common  shares for the three  months  ended  September  30, 1997 is
computed  without  regard to shares of common  stock  issuable  upon the assumed
exercise  of  common  stock  equivalents  and  shares of  common  stock  assumed
repurchased  for treasury due to their  anti-dilutive  effect.  Shares of common
stock assumed  repurchased  for treasury for the nine months ended September 30,
1997 are at an average  market price of $35.60.  Shares of common stock  assumed
repurchased for treasury are at an average market price of $25.74 and $27.63 for
the three and nine months ended September 30, 1996, respectively.

<PAGE>


                                                                     Exhibit 11
                                                                  -------------
                                                                   (Page 2 of 2)

                 MCI COMMUNICATIONS CORPORATION AND SUBSIDIARIES
                    COMPUTATION OF EARNINGS PER COMMON SHARE
                     (In millions, except per share amounts)
                                   (unaudited)

                                             Three months          Nine months
                                                ended                 ended
                                             September 30,        September 30,
                                             -------------        -------------
                                              1997    1996         1997    1996
Assuming Full Dilution                        ----    ----         ----    ----
----------------------
Net income (loss)                            $(182)   $304         $393    $899
                                              ====    ====         ====    ====
Adjustment of shares outstanding:
  Weighted average shares of common stock
    outstanding                                695     685          690     688
  Shares of common stock issuable upon the
    assumed exercise of common stock
    equivalents                                  -      42           70      57
  Shares of common stock assumed repurchased
    for treasury(b)                              -     (36)         (54)    (50)
                                             -----   -----        -----   -----
  Adjusted shares of common stock and common
    stock equivalents for computation          695     691          706     695
                                              ====    ====         ====    ====
Earnings (loss) per common and common
  equivalent shares                          $(.26)   $.44         $.56   $1.29
                                              ====    ====         ====    ====


(b) Loss per common  shares for the three  months  ended  September  30, 1997 is
computed  without  regard to shares of common  stock  issuable  upon the assumed
exercise  of  common  stock  equivalents  and  shares of  common  stock  assumed
repurchased  for treasury  due to their  anti-dilutive  effect.  The nine months
ended September 30, 1997 average market price of $35.60 was used as it is higher
than the  ending  market  price of  $29.38.  The  three  and nine  months  ended
September 30, 1996 average market prices of $25.74 and $27.63, respectively, was
used as they were higher than the ending market price of $25.63.