CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Income Statement [Abstract]
OPERATING REVENUE	$ 3,221,000,000	$ 3,641,000,000	$ 9,779,000,000	$ 11,040,000,000
OPERATING EXPENSES
Cost of services and products (exclusive of depreciation and amortization)	1,692,000,000	1,850,000,000	4,997,000,000	5,407,000,000
Selling, general and administrative	696,000,000	791,000,000	2,261,000,000	2,302,000,000
Net loss on sale of business	0	22,000,000	17,000,000	112,000,000
Depreciation and amortization	707,000,000	755,000,000	2,198,000,000	2,234,000,000
Goodwill impairment	0	0	0	8,793,000,000
Total operating expenses	3,095,000,000	3,418,000,000	9,473,000,000	18,848,000,000
OPERATING INCOME (LOSS)	126,000,000	223,000,000	306,000,000	(7,808,000,000)
OTHER (EXPENSE) INCOME
Interest expense	(351,000,000)	(295,000,000)	(1,015,000,000)	(868,000,000)
Net (loss) gain on early retirement of debt (Note 5)	(1,000,000)	0	277,000,000	618,000,000
Other income (expense), net	54,000,000	(13,000,000)	321,000,000	(37,000,000)
Total other expense, net	(298,000,000)	(308,000,000)	(417,000,000)	(287,000,000)
LOSS BEFORE INCOME TAXES	(172,000,000)	(85,000,000)	(111,000,000)	(8,095,000,000)
Income tax (benefit) expense	(24,000,000)	(7,000,000)	29,000,000	208,000,000
NET LOSS	$ (148,000,000)	$ (78,000,000)	$ (140,000,000)	$ (8,303,000,000)
BASIC AND DILUTED LOSS PER COMMON SHARE
BASIC (in dollars per share)	$ (0.15)	$ (0.08)	$ (0.14)	$ (8.45)
DILUTED (in dollars per share)	$ (0.15)	$ (0.08)	$ (0.14)	$ (8.45)
WEIGHTED-AVERAGE COMMON SHARES OUTSTANDING
BASIC (in shares)	988,794	983,550	986,963	982,853
DILUTED (in shares)	988,794	983,550	986,963	982,853