<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
COMPANY'S BALANCE SHEET AT MARCH 31, 1996, JUNE 30, 1996, SEPTEMBER 30, 1996,
AND DECEMBER 31, 1996, AND INCOME STATEMENTS FOR THE PERIODS ENDED MARCH 31,
1996, JUNE 30, 1996, SEPTEMBER 30, 1996, AND DECEMBER 31, 1996, AND IS
QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS AND THEIR
RELATED FOOTNOTES. THIS SCHEDULE IS A RESTATEMENT OF SCHEDULES FROM PREVIOUS
FILINGS TO INCORPORATE THE PROVISIONS OF SFAS NO. 128 - EARNINGS PER SHARE.
</LEGEND>
<MULTIPLIER> 1,000,000
<PERIOD-TYPE> 3-MOS 6-MOS 9-MOS 12-MOS
<FISCAL-YEAR-END> DEC-31-1996 DEC-31-1996 DEC-31-1996 DEC-31-1996
<PERIOD-END> MAR-31-1996 JUN-30-1996 SEP-30-1996 DEC-31-1996
<CASH> 980 1,052 1,091 892
<SECURITIES> 449 437 436 745
<RECEIVABLES> 4,312 4,400 4,458 4,106
<ALLOWANCES> 68 68 67 71
<INVENTORY> 1,383 1,579 1,447 1,431
<CURRENT-ASSETS> 7,920 8,298 8,249 7,942
<PP&E> 48,390 48,854 48,316 46,936
<DEPRECIATION> 26,728 27,082 26,858 25,440
<TOTAL-ASSETS> 34,369 34,658 35,079 34,854
<CURRENT-LIABILITIES> 9,329 9,168 9,243 8,907
<BONDS> 4,274 4,042 4,023 3,988
<COMMON> 1,069 1,069 1,069 1,069
<PREFERRED-MANDATORY> 0 0 0 0
<PREFERRED> 0 0 0 0
<OTHER-SE> 13,607 14,129 14,427 14,554
<TOTAL-LIABILITY-AND-EQUITY> 34,369 34,658 35,079 34,854
<SALES> 10,157 20,671 31,517 42,782
<TOTAL-REVENUES> 10,336 21,333 32,382 43,893
<CGS> 0 0 0 0
<TOTAL-COSTS> 9,247 18,824 28,622 39,153
<OTHER-EXPENSES> 0 0 0 0
<LOSS-PROVISION> 0 0 0 0
<INTEREST-EXPENSE> 96 181 274 364
<INCOME-PRETAX> 1,089 2,509 3,760 4,740
<INCOME-TAX> 473 1,021 1,617 2,133
<INCOME-CONTINUING> 616 1,488 2,143 2,607
<DISCONTINUED> 0 0 0 0
<EXTRAORDINARY> 0 0 0 0
<CHANGES> 0 0 0 0
<NET-INCOME> 616 1,488 2,143 2,607
<EPS-PRIMARY> 0.94 2.28 3.28 3.99
<EPS-DILUTED> 0.94 2.27 3.27 3.98