CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
OPERATING ACTIVITIES
Net (loss) income	$ (8,736)	$ 344	$ (8,225)	$ 943
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization			1,479	1,635
Loss on disposal group held for sale	13	0	90	0
Goodwill impairment			8,793	0
Deferred income taxes			46	249
Provision for uncollectible accounts			47	56
Net gain on early retirement of debt			(618)	0
Unrealized loss on investments			81	71
Stock-based compensation			23	48
Changes in current assets and liabilities:
Accounts receivable			(36)	32
Accounts payable			(11)	79
Accrued income and other taxes			(1,011)	13
Other current assets and liabilities, net			(330)	(430)
Retirement benefits			(16)	(86)
Changes in other noncurrent assets and liabilities, net			132	65
Other, net			51	96
Net cash provided by operating activities			495	2,771
INVESTING ACTIVITIES
Capital expenditures			(1,436)	(1,338)
Proceeds from sale of property, plant and equipment, and other assets			26	65
Other, net			5	3
Net cash used in investing activities			(1,405)	(1,270)
FINANCING ACTIVITIES
Payments of long-term debt			(100)	(1,532)
Net proceeds from revolving line of credit			200	600
Dividends paid			(9)	(525)
Other, net			(19)	(32)
Net cash provided by (used in) financing activities			72	(1,489)
Net (decrease) increase in cash, cash equivalents and restricted cash			(838)	12
Cash, cash equivalents and restricted cash at beginning of period			1,307	409	$ 409
Cash, cash equivalents and restricted cash at end of period	469	421	469	421	1,307
Supplemental cash flow information:
Income taxes paid, net			(1,270)	(58)
Interest paid (net of capitalized interest of $45 and $32)			(561)	(699)
Supplemental noncash information regarding financing activities:
Cancellation of senior unsecured notes as part of exchange offers (Note 6)			(1,554)	0
Issuance of senior secured notes as part of exchange offers (Note 6)			924	0
Cash, cash equivalents and restricted cash:
Cash and cash equivalents	411	360	411	360	1,251
Cash and cash equivalents and restricted cash included in Assets held for sale	47	48	47	48
Restricted cash included in Other current assets	0	1	0	1
Restricted cash included in Other, net noncurrent assets	11	12	11	12
Total	$ 469	$ 421	$ 469	$ 421	$ 1,307