CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Statement [Abstract]
OPERATING REVENUE	$ 17,478,000,000	$ 19,687,000,000	$ 20,712,000,000
OPERATING EXPENSES
Cost of services and products (exclusive of depreciation and amortization)	7,868,000,000	8,488,000,000	8,934,000,000
Selling, general and administrative	3,078,000,000	2,895,000,000	3,464,000,000
Gain on sale of businesses	(773,000,000)	0	0
Loss on disposal groups held for sale	700,000,000	0	0
Depreciation and amortization	3,239,000,000	4,019,000,000	4,710,000,000
Goodwill impairment	3,271,000,000	0	2,642,000,000
Total operating expenses	17,383,000,000	15,402,000,000	19,750,000,000
OPERATING INCOME	95,000,000	4,285,000,000	962,000,000
OTHER EXPENSE
Interest expense	(1,332,000,000)	(1,522,000,000)	(1,668,000,000)
Other income (expense), net	246,000,000	(62,000,000)	(76,000,000)
Total other expense, net	(1,086,000,000)	(1,584,000,000)	(1,744,000,000)
(LOSS) INCOME BEFORE INCOME TAXES	(991,000,000)	2,701,000,000	(782,000,000)
Income tax expense	557,000,000	668,000,000	450,000,000
NET (LOSS) INCOME	$ (1,548,000,000)	$ 2,033,000,000	$ (1,232,000,000)
BASIC AND DILUTED EARNINGS (LOSS) PER COMMON SHARE
BASIC (in dollars per share)	$ (1.54)	$ 1.92	$ (1.14)
DILUTED (in dollars per share)	$ (1.54)	$ 1.91	$ (1.14)
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING
BASIC (in shares)	1,007,517	1,059,541	1,079,130
DILUTED (in shares)	1,007,517	1,066,778	1,079,130