CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Statement [Abstract]
OPERATING REVENUES	$ 5,902	$ 4,090	$ 11,847	$ 8,299
OPERATING EXPENSES
Cost of services and products (exclusive of depreciation and amortization)	2,730	1,890	5,533	3,778
Selling, general and administrative	1,115	884	2,224	1,694
Depreciation and amortization	1,290	949	2,573	1,829
Total operating expenses	5,135	3,723	10,330	7,301
OPERATING INCOME	767	367	1,517	998
OTHER (EXPENSE) INCOME
Interest expense	(546)	(320)	(1,081)	(638)
Other income (expense), net	16	(7)	37	(13)
Total other expense, net	(530)	(327)	(1,044)	(651)
INCOME BEFORE INCOME TAX EXPENSE	237	40	473	347
Income tax (benefit) expense	(55)	23	66	167
NET INCOME	$ 292	$ 17	$ 407	$ 180
BASIC AND DILUTED EARNINGS PER COMMON SHARE
BASIC (in dollars per share)	$ 0.27	$ 0.03	$ 0.38	$ 0.33
DILUTED (in dollars per share)	0.27	0.03	0.38	0.33
DIVIDENDS DECLARED PER COMMON SHARE (in dollars per share)	$ 0.54	$ 0.54	$ 1.08	$ 1.08
WEIGHTED-AVERAGE COMMON SHARES OUTSTANDING
BASIC (in shares)	1,064,711,000	541,361,000	1,064,663,000	540,909,000
DILUTED (in shares)	1,068,819,000	542,151,000	1,068,414,000	541,836,000