CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Statement [Abstract]
OPERATING REVENUE	$ 14,557,000,000	$ 17,478,000,000	$ 19,687,000,000
OPERATING EXPENSES
Cost of services and products (exclusive of depreciation and amortization)	7,144,000,000	7,868,000,000	8,488,000,000
Selling, general and administrative	3,198,000,000	3,078,000,000	2,895,000,000
Net loss (gain) on sale of businesses	121,000,000	(113,000,000)	0
Loss on disposal groups held for sale	0	40,000,000	0
Depreciation and amortization	2,985,000,000	3,239,000,000	4,019,000,000
Goodwill impairment	10,693,000,000	3,271,000,000	0
Total operating expenses	24,141,000,000	17,383,000,000	15,402,000,000
OPERATING (LOSS) INCOME	(9,584,000,000)	95,000,000	4,285,000,000
OTHER EXPENSE
Interest expense	(1,158,000,000)	(1,332,000,000)	(1,522,000,000)
Net gain on early retirement of debt (Note 7)	618,000,000	214,000,000	8,000,000
Other (expense) income, net	(113,000,000)	32,000,000	(70,000,000)
Total other expense, net	(653,000,000)	(1,086,000,000)	(1,584,000,000)
(LOSS) INCOME BEFORE INCOME TAXES	(10,237,000,000)	(991,000,000)	2,701,000,000
Income tax expense	61,000,000	557,000,000	668,000,000
NET (LOSS) INCOME	$ (10,298,000,000)	$ (1,548,000,000)	$ 2,033,000,000
BASIC AND DILUTED (LOSS) EARNINGS PER COMMON SHARE
BASIC (in dollars per share)	$ (10.48)	$ (1.54)	$ 1.92
DILUTED (in dollars per share)	$ (10.48)	$ (1.54)	$ 1.91
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING
BASIC (in shares)	983,081	1,007,517	1,059,541
DILUTED (in shares)	983,081	1,007,517	1,066,778