CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement [Abstract]
OPERATING REVENUE	$ 22,401	$ 23,443	$ 17,656
OPERATING EXPENSES
Cost of services and products (exclusive of depreciation and amortization)	10,077	10,862	8,203
Selling, general and administrative	3,715	4,165	3,508
Depreciation and amortization	4,829	5,120	3,936
Goodwill impairment	6,506	2,726	0
Total operating expenses	25,127	22,873	15,647
OPERATING (LOSS) INCOME	(2,726)	570	2,009
OTHER (EXPENSE) INCOME
Interest expense	(2,021)	(2,177)	(1,481)
Other (loss) income, net	(19)	44	12
Total other expense, net	(2,040)	(2,133)	(1,469)
(LOSS) INCOME BEFORE INCOME TAX EXPENSE	(4,766)	(1,563)	540
Income tax expense (benefit)	503	170	(849)
NET (LOSS) INCOME	$ (5,269)	$ (1,733)	$ 1,389
BASIC AND DILUTED (LOSS) EARNINGS PER COMMON SHARE
BASIC (in dollars per share)	$ (4.92)	$ (1.63)	$ 2.21
DILUTED (in dollars per share)	$ (4.92)	$ (1.63)	$ 2.21
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING
BASIC (in shares)	1,071,441	1,065,866	627,808
DILUTED (in shares)	1,071,441	1,065,866	628,693