CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
CURRENT ASSETS
Cash and cash equivalents	$ 935	$ 406
Accounts receivable, less allowance of $152 and $191	1,905	1,962
Other	906	808
Total current assets	3,746	3,176
Property, plant and equipment, net of accumulated depreciation of $32,917 and $31,596	25,993	26,338
GOODWILL AND OTHER ASSETS
Goodwill	18,867	18,870
Other intangible assets, net	7,663	8,219
Other, net	2,678	2,791
Total goodwill and other assets	29,208	29,880
TOTAL ASSETS	58,947	59,394
CURRENT LIABILITIES
Current maturities of long-term debt	2,595	2,427
Accounts payable	966	1,134
Accrued expenses and other liabilities
Salaries and benefits	931	1,008
Income and other taxes	294	314
Current operating lease liabilities	389	379
Interest	301	291
Other	286	328
Current portion of deferred revenue	748	753
Total current liabilities	6,510	6,634
LONG-TERM DEBT	28,574	29,410
DEFERRED CREDITS AND OTHER LIABILITIES
Deferred income taxes, net	3,643	3,342
Benefit plan obligations, net	4,321	4,556
Other	4,193	4,290
Total deferred credits and other liabilities	12,157	12,188
COMMITMENTS AND CONTINGENCIES (Note 12)
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 1,105,186 and 1,096,921 shares	1,105	1,097
Additional paid-in capital	20,361	20,909
Accumulated other comprehensive loss	(2,710)	(2,813)
Accumulated deficit	(7,050)	(8,031)
Total stockholders' equity	11,706	11,162
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 58,947	$ 59,394