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                                                                                             Exhibit 99(a)


                              MCI COMMUNICATIONS CORPORATION AND SUBSIDIARIES
                                          CAPITALIZATION SCHEDULE
                                               (In millions)
                                                (unaudited)
Set forth below is the capitalization of the company as of June 30, 1998:

Debt(a):
  Secured debt:
     <S>                                                                                                                    <C>    
     Capital lease obligations............................                                                                   $   539
     Other secured obligations............................                                                                         8
                                                                                                                             -------
  Total secured debt......................................                                                                       547
                                                                                                                             -------
  Unsecured debt:
     Senior Notes, net....................................                                                                     2,630
     Senior Debentures, net...............................                                                                     1,384
     Commercial paper borrowings..........................                                                                         -
     Other unsecured debt.................................                                                                       114
     Capital lease obligations                                                                                                     5
                                                                                                                             -------
  Total unsecured debt....................................                                                                     4,133
                                                                                                                             -------
Total debt................................................                                                                   $ 4,680
                                                                                                                             -------
Company Obligated Mandatorily Redeemable Preferred
     Securities of Subsidiary Trust Holding Solely
     Junior Subordinated Deferrable Interest
     Debentures of the Company (b)........................                                                                   $   750
                                                                                                                             -------
Stockholders' equity:
     Class A common stock, $.10 par value, authorized
       500 million shares, issued 136 million shares......                                                                   $    14
     Common stock, $.10 par value, authorized 2 billion
       shares, issued 593 million shares..................                                                                        60
     Additional paid in capital...........................                                                                     6,489
     Retained earnings....................................                                                                     5,623
     Accumulated other comprehensive income                                                                                        2
     Treasury stock, at cost, 0 million shares...........                                                                          -
                                                                                                                             -------
Total stockholders' equity................................                                                                   $12,188
                                                                                                                             -------
Total capitalization......................................                                                                   $17,618
                                                                                                                             =======

(a)  For  additional   information   concerning  the  company's   capital  lease
obligations,  which are  obligations  of  subsidiaries  of the company  that are
guaranteed  by the  company,  and  for  additional  information  concerning  the
company's  long-term  debt,  see  Note  7 of  Notes  to  Consolidated  Financial
Statements of the company's Annual Report to Stockholders,  which is included in
Exhibit  13 to the  company's  Annual  Report  on Form  10-K for the year  ended
December 31, 1997.  Interest rates on capital lease  obligations,  on a weighted
average basis, approximated 9.4% per annum at June 30, 1998.

(b) On May 29, 1996, MCI Capital I, a wholly-owned  Delaware  statutory business
trust (Trust),  issued $750 million aggregate  principal amount of 8% Cumulative
Quarterly Income Preferred  Securities,  Series A (preferred  securities) due on
June 30, 2026.  The Trust  exists for the sole purpose of issuing the  preferred
securities  and investing  the proceeds in the company's 8% Junior  Subordinated
Deferrable Interest Debentures, Series A (Subordinated Debt Securities) due June
30, 2026.


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