CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
CURRENT ASSETS
Cash and cash equivalents	$ 406	$ 1,690
Accounts receivable, less allowance of $191 and $106	1,962	2,259
Other	808	819
Total current assets	3,176	4,768
Property, plant and equipment, net of accumulated depreciation of $31,596 and $29,346	26,338	26,079
GOODWILL AND OTHER ASSETS
Goodwill	18,870	21,534
Other intangible assets, net	8,219	9,567
Other, net	2,791	2,794
Total goodwill and other assets	29,880	33,895
TOTAL ASSETS	59,394	64,742
CURRENT LIABILITIES
Current maturities of long-term debt	2,427	2,300
Accounts payable	1,134	1,724
Accrued expenses and other liabilities
Salaries and benefits	1,008	1,037
Income and other taxes	314	311
Current operating lease liabilities	379	416
Interest	291	280
Other	328	386
Current portion of deferred revenue	753	804
Total current liabilities	6,634	7,258
LONG-TERM DEBT	29,410	32,394
DEFERRED CREDITS AND OTHER LIABILITIES
Deferred income taxes, net	3,342	2,918
Benefit plan obligations, net	4,556	4,594
Other	4,290	4,108
Total deferred credits and other liabilities	12,188	11,620
COMMITMENTS AND CONTINGENCIES (Note 17)
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 1,096,921 and 1,090,058 shares	1,097	1,090
Additional paid-in capital	20,909	21,874
Accumulated other comprehensive loss	(2,813)	(2,680)
Accumulated deficit	(8,031)	(6,814)
Total stockholders' equity	11,162	13,470
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 59,394	$ 64,742