Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenues
Revenues	$ 11,080	$ 10,455
Operating expenses
Selling, general and administrative	3,442	3,164
Depreciation and amortization	1,600	1,575
Total operating expense	9,604	9,173
Operating income	1,476	1,282
Other income (expense)
Interest expense	(179)	(251)
Interest expense to affiliates	(109)	(166)
Interest income	8	6
Other income (expense), net	7	10
Total other expense, net	(273)	(401)
Income before income taxes	1,203	881
Income tax expense	(295)	(210)
Net income	908	671
Net income	908	671
Other comprehensive loss, net of tax
Unrealized loss on available-for-sale securities, net of tax effect of $0 and $(1)	0	(3)
Unrealized loss on cash flow hedges, net of tax effect of $(66) and $0	(189)	0
Other comprehensive loss	(189)	(3)
Total comprehensive income	$ 719	$ 668
Earnings per share
Basic (in USD per share)	$ 1.07	$ 0.78
Diluted (in USD per share)	$ 1.06	$ 0.78
Weighted average shares outstanding
Basic (in shares)	851,223,498	855,222,664
Diluted (in shares)	858,643,481	862,244,084
Branded postpaid revenues
Revenues
Revenues	$ 5,493	$ 5,070
Branded prepaid revenues
Revenues
Revenues	2,386	2,402
Wholesale revenues
Revenues
Revenues	304	266
Roaming and other service revenues
Revenues
Revenues	94	68
Service
Revenues
Revenues	8,277	7,806
Operating expenses
Cost of services and equipment sales	1,546	1,589
Equipment
Revenues
Revenues	2,516	2,353
Operating expenses
Cost of services and equipment sales	3,016	2,845
Other revenues
Revenues
Revenues	$ 287	$ 296