CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Income Statement [Abstract]
OPERATING REVENUE	$ 3,268,000,000	$ 3,661,000,000	$ 6,558,000,000	$ 7,399,000,000
OPERATING EXPENSES
Cost of services and products (exclusive of depreciation and amortization)	1,653,000,000	1,740,000,000	3,305,000,000	3,557,000,000
Selling, general and administrative	742,000,000	790,000,000	1,565,000,000	1,511,000,000
(Gain) loss on sale of business	(5,000,000)	13,000,000	17,000,000	90,000,000
Depreciation and amortization	743,000,000	746,000,000	1,491,000,000	1,479,000,000
Goodwill impairment	0	8,793,000,000	0	8,793,000,000
Total operating expenses	3,133,000,000	12,082,000,000	6,378,000,000	15,430,000,000
OPERATING INCOME (LOSS)	135,000,000	(8,421,000,000)	180,000,000	(8,031,000,000)
OTHER (EXPENSE) INCOME
Interest expense	(373,000,000)	(294,000,000)	(664,000,000)	(573,000,000)
Net gain on early retirement of debt (Note 5)	3,000,000	9,000,000	278,000,000	618,000,000
Other income (expense), net	194,000,000	16,000,000	267,000,000	(24,000,000)
Total other (expense) income, net	(176,000,000)	(269,000,000)	(119,000,000)	21,000,000
(LOSS) INCOME BEFORE INCOME TAXES	(41,000,000)	(8,690,000,000)	61,000,000	(8,010,000,000)
Income tax expense	8,000,000	46,000,000	53,000,000	215,000,000
NET (LOSS) INCOME	$ (49,000,000)	$ (8,736,000,000)	$ 8,000,000	$ (8,225,000,000)
BASIC AND DILUTED (LOSS) EARNINGS PER COMMON SHARE
BASIC (in dollars per share)	$ (0.05)	$ (8.88)	$ 0.01	$ (8.37)
DILUTED (in dollars per share)	$ (0.05)	$ (8.88)	$ 0.01	$ (8.37)
WEIGHTED-AVERAGE COMMON SHARES OUTSTANDING
BASIC (in shares)	987,239	983,453	986,047	982,505
DILUTED (in shares)	987,239	983,453	987,224	982,505