CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
CURRENT ASSETS
Cash and cash equivalents	$ 501	$ 551
Restricted cash - current	5	5
Accounts receivable, less allowance of $168 and $164	2,432	2,557
Assets held for sale	140	140
Other	1,105	941
Total current assets	4,183	4,194
Property, plant and equipment, net of accumulated depreciation of $25,116 and $24,352	26,826	26,852
GOODWILL AND OTHER ASSETS
Goodwill	30,778	30,475
Restricted cash	31	31
Other intangible assets, less accumulated amortization of $2,412 and $2,325	1,870	1,897
Other, net	1,047	1,286
Total goodwill and other assets	43,784	44,565
TOTAL ASSETS	74,793	75,611
CURRENT LIABILITIES
Current maturities of long-term debt	437	443
Accounts payable	1,508	1,555
Accrued expenses and other liabilities
Salaries and benefits	798	890
Income and other taxes	390	370
Interest	386	363
Other	428	344
Advance billings and customer deposits	820	892
Total current liabilities	4,767	4,857
LONG-TERM DEBT	36,940	37,283
DEFERRED CREDITS AND OTHER LIABILITIES
Deferred income taxes, net	2,196	2,413
Benefit plan obligations, net	5,085	5,178
Other	2,362	2,389
Total deferred credits and other liabilities	9,643	9,980
COMMITMENTS AND CONTINGENCIES (Note 11)
STOCKHOLDERS' EQUITY
Preferred stock—non-redeemable, $25.00 par value, authorized 2,000 and 2,000 shares, issued and outstanding 7 and 7 shares	0	0
Common stock, $1.00 par value, authorized 1,600,000 and 1,600,000 shares, issued and outstanding 1,078,632 and 1,069,169 shares	1,079	1,069
Additional paid-in capital	23,316	23,314
Accumulated other comprehensive loss	(2,288)	(1,995)
Retained earnings	1,336	1,103
Total stockholders' equity	23,443	23,491
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	74,793	75,611
Customer relationships
GOODWILL AND OTHER ASSETS
Customer relationships, less accumulated amortization of $7,450 and $7,096	$ 10,058	$ 10,876