CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
OPERATING REVENUES	$ 5,945	$ 4,209
OPERATING EXPENSES
Cost of services and products (exclusive of depreciation and amortization)	2,803	1,888
Selling, general and administrative	1,109	810
Depreciation and amortization	1,283	880
Total operating expenses	5,195	3,578
OPERATING INCOME	750	631
OTHER (EXPENSE) INCOME
Interest expense	(535)	(318)
Other income (expense), net	21	(6)
Total other expense, net	(514)	(324)
INCOME BEFORE INCOME TAX EXPENSE	236	307
Income tax expense	121	144
NET INCOME	$ 115	$ 163
BASIC AND DILUTED EARNINGS PER COMMON SHARE
BASIC (in dollars per share)	$ 0.11	$ 0.30
DILUTED (in dollars per share)	0.11	0.30
DIVIDENDS DECLARED PER COMMON SHARE (in dollars per share)	$ 0.54	$ 0.54
WEIGHTED-AVERAGE COMMON SHARES OUTSTANDING
BASIC (in shares)	1,065,796	540,458
DILUTED (in shares)	1,069,183	541,522