CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
OPERATING ACTIVITIES
Net (loss) income	$ (1,548)	$ 2,033	$ (1,232)
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization	3,239	4,019	4,710
Gain on sale of businesses	(773)	0	0
Loss on disposal groups held for sale	700	0	0
Goodwill impairment	3,271	0	2,642
Deferred income taxes	(1,230)	598	366
Provision for uncollectible accounts	133	105	189
Net (gain) loss on early retirement and modification of debt	(214)	(8)	105
Unrealized loss (gain) on investments	191	(138)	0
Stock-based compensation	98	120	175
Changes in current assets and liabilities:
Accounts receivable	(158)	(8)	115
Accounts payable	98	(261)	(543)
Accrued income and other taxes	972	(69)	27
Other current assets and liabilities, net	(372)	(353)	(262)
Retirement benefits	46	163	(111)
Changes in other noncurrent assets and liabilities, net	258	283	246
Other, net	24	17	97
Net cash provided by operating activities	4,735	6,501	6,524
INVESTING ACTIVITIES
Capital expenditures	(3,016)	(2,900)	(3,729)
Proceeds from sale of businesses	8,369	0	0
Proceeds from sale of property, plant and equipment and other assets	120	135	153
Other, net	3	53	12
Net cash provided by (used in) investing activities	5,476	(2,712)	(3,564)
FINANCING ACTIVITIES
Net proceeds from issuance of long-term debt	0	1,881	4,361
Payments of long-term debt	(8,093)	(3,598)	(7,315)
Net (payments of) proceeds from revolving line of credit	(200)	50	(100)
Dividends paid	(780)	(1,087)	(1,109)
Repurchases of common stock	(200)	(1,000)	0
Other, net	(40)	(53)	(87)
Net cash used in financing activities	(9,313)	(3,807)	(4,250)
Net increase (decrease) in cash, cash equivalents and restricted cash	898	(18)	(1,290)
Cash, cash equivalents and restricted cash at beginning of period	409	427	1,717
Cash, cash equivalents and restricted cash at end of period	1,307	409	427
Supplemental cash flow information:
Income taxes (paid) refunded, net	(76)	(112)	28
Interest paid (net of capitalized interest of $66, $53 and $75)	(1,365)	(1,487)	(1,627)
Supplemental non-cash information regarding investing activities:
Sale of property, plant and equipment in exchange for note receivable	0	56	0
Supplemental non-cash information regarding financing activities:
Purchase of software subscription in exchange for installment debt	0	77	0
Cash, cash equivalents and restricted cash:
Cash and cash equivalents	1,251	354	406
Cash and cash equivalents and restricted cash included in Assets held for sale	44	40	0
Restricted cash included in Other current assets	0	2	3
Restricted cash included in Other, net noncurrent assets	12	13	18
Total	$ 1,307	$ 409	$ 427