Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenues
Revenues	$ 17,671	$ 10,979	$ 28,784	$ 22,059
Operating expenses
Selling, general and administrative	5,604	3,543	9,292	6,985
Impairment expense	418	0	418	0
Depreciation and amortization	4,064	1,585	5,782	3,185
Total operating expenses	16,851	9,438	26,425	19,042
Operating income	820	1,541	2,359	3,017
Other income (expense)
Interest expense	(776)	(182)	(961)	(361)
Interest expense to affiliates	(63)	(101)	(162)	(210)
Interest income	6	4	18	12
Other expense, net	(195)	(22)	(205)	(15)
Total other expense, net	(1,028)	(301)	(1,310)	(574)
(Loss) income from continuing operations before income taxes	(208)	1,240	1,049	2,443
Income tax expense	(2)	(301)	(308)	(596)
(Loss) income from continuing operations	(210)	939	741	1,847
Income from discontinued operations, net of tax	320	0	320	0
Net income	110	939	1,061	1,847
Net income	110	939	1,061	1,847
Other comprehensive loss, net of tax
Unrealized gain (loss) on cash flow hedges, net of tax effect of $3, $(102) , $(273) and $(168)	2	(292)	(790)	(481)
Total comprehensive income	$ 112	$ 647	$ 271	$ 1,366
Earnings Per Share, Basic [Abstract]
Continuing operations (in USD per share)	$ (0.17)	$ 1.10	$ 0.71	$ 2.16
Discontinued operations (in USD per share)	0.26	0	0.30	0
Basic (in USD per share)	0.09	1.10	1.01	2.16
Earnings Per Share, Diluted [Abstract]
Continuing operations (in USD per share)	(0.17)	1.09	0.70	2.14
Discontinued operations (in USD per share)	0.26	0	0.30	0
Diluted (in USD per share)	$ 0.09	$ 1.09	$ 1.00	$ 2.14
Weighted average shares outstanding
Basic (in shares)	1,236,528,444	854,368,443	1,047,338,364	852,796,369
Diluted (in shares)	1,236,528,444	860,135,593	1,057,120,389	860,890,870
Postpaid revenues
Revenues
Revenues	$ 9,959	$ 5,613	$ 15,846	$ 11,106
Prepaid revenues
Revenues
Revenues	2,311	2,379	4,684	4,765
Wholesale revenues
Revenues
Revenues	408	313	733	617
Roaming and other service revenues
Revenues
Revenues	552	241	813	449
Service
Revenues
Revenues	13,230	8,546	22,076	16,937
Operating expenses
Cost of services and equipment sales	3,098	1,649	4,737	3,195
Equipment
Revenues
Revenues	4,269	2,263	6,386	4,779
Operating expenses
Cost of services and equipment sales	3,667	2,661	6,196	5,677
Other revenues
Revenues
Revenues	$ 172	$ 170	$ 322	$ 343