CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Income Statement [Abstract]
OPERATING REVENUE	$ 3,092,000,000	$ 3,268,000,000	$ 6,274,000,000	$ 6,558,000,000
OPERATING EXPENSES
Cost of services and products (exclusive of depreciation and amortization)	1,624,000,000	1,653,000,000	3,311,000,000	3,305,000,000
Selling, general and administrative	755,000,000	742,000,000	1,430,000,000	1,565,000,000
Net (gain) loss on sale of business	0	(5,000,000)	0	17,000,000
Depreciation and amortization	688,000,000	743,000,000	1,401,000,000	1,491,000,000
Goodwill impairment	628,000,000	0	628,000,000	0
Total operating expenses	3,695,000,000	3,133,000,000	6,770,000,000	6,378,000,000
OPERATING (LOSS) INCOME	(603,000,000)	135,000,000	(496,000,000)	180,000,000
OTHER (EXPENSE) INCOME
Interest expense	(338,000,000)	(373,000,000)	(685,000,000)	(664,000,000)
Net (loss) gain on early retirement of debt (Note 5)	(236,000,000)	3,000,000	(271,000,000)	278,000,000
Other income, net	28,000,000	194,000,000	58,000,000	267,000,000
Total other expense, net	(546,000,000)	(176,000,000)	(898,000,000)	(119,000,000)
(LOSS) INCOME BEFORE INCOME TAXES	(1,149,000,000)	(41,000,000)	(1,394,000,000)	61,000,000
Income tax (benefit) expense	(234,000,000)	8,000,000	(278,000,000)	53,000,000
NET (LOSS) INCOME	$ (915,000,000)	$ (49,000,000)	$ (1,116,000,000)	$ 8,000,000
BASIC AND DILUTED (LOSS) EARNINGS PER COMMON SHARE
BASIC (in dollars per share)	$ (0.92)	$ (0.05)	$ (1.12)	$ 0.01
DILUTED (in dollars per share)	$ (0.92)	$ (0.05)	$ (1.12)	$ 0.01
WEIGHTED-AVERAGE COMMON SHARES OUTSTANDING
BASIC (in shares)	994,543	987,239	992,906	986,047
DILUTED (in shares)	994,543	987,239	992,906	987,224