CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
CURRENT ASSETS
Cash and cash equivalents	$ 635	$ 406
Accounts receivable, less allowance of $117 and $191	1,541	1,962
Assets held for sale	8,682	0
Other	843	808
Total current assets	11,701	3,176
Property, plant and equipment, net of accumulated depreciation of $22,027 and $31,596	20,926	26,338
GOODWILL AND OTHER ASSETS
Goodwill	15,987	18,870
Other intangible assets, net	7,160	8,219
Other, net	2,534	2,791
Total goodwill and other assets	25,681	29,880
TOTAL ASSETS	58,308	59,394
CURRENT LIABILITIES
Current maturities of long-term debt	2,501	2,427
Accounts payable	829	1,134
Accrued expenses and other liabilities
Salaries and benefits	873	1,008
Income and other taxes	280	314
Current operating lease liabilities	389	379
Interest	229	291
Other	284	328
Liabilities held for sale	2,291	0
Current portion of deferred revenue	624	753
Total current liabilities	8,300	6,634
LONG-TERM DEBT	27,260	29,410
DEFERRED CREDITS AND OTHER LIABILITIES
Deferred income taxes, net	3,732	3,342
Benefit plan obligations, net	3,980	4,556
Other	3,853	4,290
Total deferred credits and other liabilities	11,565	12,188
COMMITMENTS AND CONTINGENCIES (Note 15)
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 2,200,000 and 2,200,000 shares, issued and outstanding 1,031,060 and 1,096,921 shares	1,031	1,097
Additional paid-in capital	19,235	20,909
Accumulated other comprehensive loss	(2,577)	(2,813)
Accumulated deficit	(6,506)	(8,031)
Total stockholders' equity	11,183	11,162
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 58,308	$ 59,394