T-Mobile US (TMUS) 10-Q 26 Jul 19 2019 Q2 Quarterly report Financial data

Cover Page

Cover Page - shares	6 Months Ended
	Jun. 30, 2019	Jul. 22, 2019
Cover page.
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2019
Document Transition Report	false
Entity File Number	1-33409
Entity Registrant Name	T-MOBILE US, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	20-0836269
Entity Address, Address Line One	12920 SE 38th Street
Entity Address, City or Town	Bellevue
Entity Address, State or Province	WA
Entity Address, Postal Zip Code	98006-1350
City Area Code	(425)
Local Phone Number	378-4000
Title of 12(b) Security	Common Stock, par value $0.00001 per share
Trading Symbol	TMUS
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Central Index Key	0001283699
Amendment Flag	false
Entity Small Business	false
Entity Emerging Growth Company	false
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Current Fiscal Year End Date	--12-31
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		854,457,048

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 1,105	$ 1,203
Accounts receivable, net of allowances of $61 and $67	1,817	1,769
Equipment installment plan receivables, net	2,446	2,538
Accounts receivable from affiliates	18	11
Inventory	998	1,084
Other current assets	1,730	1,676
Total current assets	8,114	8,281
Property and equipment, net	21,847	23,359
Operating lease right-of-use assets	10,439
Financing lease right-of-use assets	2,589
Goodwill	1,901	1,901
Spectrum licenses	36,430	35,559
Other intangible assets, net	157	198
Equipment installment plan receivables due after one year, net	1,604	1,547
Other assets	1,707	1,623
Total assets	84,788	72,468
Current liabilities
Accounts payable and accrued liabilities	7,260	7,741
Payables to affiliates	198	200
Short-term debt	300	841
Deferred revenue	620	698
Short-term operating lease liabilities	2,268
Short-term financing lease liabilities	963
Other current liabilities	1,564	787
Total current liabilities	13,173	10,267
Long-term debt	10,954	12,124
Long-term debt to affiliates	13,985	14,582
Tower obligations	2,247	2,557
Deferred tax liabilities	5,090	4,472
Operating lease liabilities	10,145
Financing lease liabilities	1,314
Deferred rent expense		2,781
Other long-term liabilities	913	967
Total long-term liabilities	44,648	37,483
Commitments and contingencies (Note 12)
Stockholders' equity
Common Stock, par value $0.00001 per share, 1,000,000,000 shares authorized; 855,970,789 and 851,675,119 shares issued, 854,452,642 and 850,180,317 shares outstanding	0	0
Additional paid-in capital	38,242	38,010
Treasury stock, at cost, 1,518,147 and 1,494,802 shares issued	(8)	(6)
Accumulated other comprehensive loss	(813)	(332)
Accumulated deficit	(10,454)	(12,954)
Total stockholders' equity	26,967	24,718
Total liabilities and stockholders' equity	$ 84,788	$ 72,468

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Allowances	$ 61	$ 67
Common stock, par value (in USD per share)	$ 0.00001	$ 0.00001
Common stock, shares authorized (in shares)	1,000,000,000	1,000,000,000
Common stock, shares issued (in shares)	855,970,789	851,675,119
Common stock, shares outstanding (in shares)	854,452,642	850,180,317
Treasury stock, at cost (in shares)	1,518,147	1,494,802

Condensed Consolidated Statemen

Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenues
Revenues	$ 10,979	$ 10,571	$ 22,059	$ 21,026
Operating expenses
Selling, general and administrative	3,543	3,185	6,985	6,349
Depreciation and amortization	1,585	1,634	3,185	3,209
Total operating expense	9,438	9,121	19,042	18,294
Operating income	1,541	1,450	3,017	2,732
Other income (expense)
Interest expense	(182)	(196)	(361)	(447)
Interest expense to affiliates	(101)	(128)	(210)	(294)
Interest income	4	6	12	12
Other expense, net	(22)	(64)	(15)	(54)
Total other expense, net	(301)	(382)	(574)	(783)
Income before income taxes	1,240	1,068	2,443	1,949
Income tax expense	(301)	(286)	(596)	(496)
Net income	939	782	1,847	1,453
Net income	939	782	1,847	1,453
Other comprehensive loss, net of tax
Unrealized gain on available-for-sale securities, net of tax effect of $0, $1, $0 and $0	0	3	0	0
Unrealized loss on cash flow hedges, net of tax effect of $(102), $0, $(168), and $0	(292)	0	(481)	0
Other comprehensive (loss) income	(292)	3	(481)	0
Total comprehensive income	$ 647	$ 785	$ 1,366	$ 1,453
Earnings per share
Basic (in USD per share)	$ 1.10	$ 0.92	$ 2.16	$ 1.71
Diluted (in USD per share)	$ 1.09	$ 0.92	$ 2.14	$ 1.69
Weighted average shares outstanding
Basic (in shares)	854,368,443	847,660,488	852,796,369	851,420,686
Diluted (in shares)	860,135,593	852,040,670	860,890,870	858,728,832
Branded postpaid revenues
Revenues
Revenues	$ 5,613	$ 5,164	$ 11,106	$ 10,234
Branded prepaid revenues
Revenues
Revenues	2,379	2,402	4,765	4,804
Wholesale revenues
Revenues
Revenues	313	275	617	541
Roaming and other service revenues
Revenues
Revenues	121	90	215	158
Service
Revenues
Revenues	8,426	7,931	16,703	15,737
Operating expenses
Cost of services and equipment sales	1,649	1,530	3,195	3,119
Equipment
Revenues
Revenues	2,263	2,325	4,779	4,678
Operating expenses
Cost of services and equipment sales	2,661	2,772	5,677	5,617
Other revenues
Revenues
Revenues	$ 290	$ 315	$ 577	$ 611

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement [Abstract]
Available-for-sale securities, tax effect	$ 0	$ 1	$ 0	$ 0
Cash flow hedges, tax effect	$ (102)	$ 0	$ (168)	$ 0

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Operating activities
Net income		$ 939	$ 782	$ 1,847	$ 1,453
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization		1,585	1,634	3,185	3,209
Stock-based compensation expense		130	112	240	209
Deferred income tax expense		267	272	555	478
Bad debt expense		71	75	144	129
Losses from sales of receivables		28	27	63	79
Deferred rent expense		0	7	0	11
Losses on redemption of debt		19	90	19	122
Changes in operating assets and liabilities
Accounts receivable		(805)	(1,136)	(1,948)	(2,009)
Equipment installment plan receivables		(150)	(286)	(400)	(508)
Inventories		162	125	(103)	158
Operating lease right-of-use assets		469		904
Other current and long-term assets		(83)	(248)	(170)	(116)
Accounts payable and accrued liabilities		43	(79)	56	(1,107)
Short and long-term operating lease liabilities		(521)		(1,043)
Other current and long-term liabilities		(27)	(105)	94	(60)
Other, net		20	(9)	96	(17)
Net cash provided by operating activities		2,147	1,261	3,539	2,031
Investing activities
Purchases of property and equipment, including capitalized interest of $125 and $102 and $243 and $145		(1,789)	(1,629)	(3,720)	(2,995)
Purchases of spectrum licenses and other intangible assets, including deposits		(665)	(28)	(850)	(79)
Proceeds related to beneficial interests in securitization transactions		839	1,323	1,996	2,618
Acquisition of companies, net of cash acquired		0	(5)	0	(338)
Other, net		0	33	(7)	26
Net cash used in investing activities		(1,615)	(306)	(2,581)	(768)
Financing activities
Proceeds from issuance of long-term debt		0	0	0	2,494
Payments of consent fees related to long-term debt		0	(38)	0	(38)
Proceeds from borrowing on revolving credit facility		880	2,070	1,765	4,240
Repayments of revolving credit facility		(880)	(2,195)	(1,765)	(3,920)
Repayments of financing lease obligations		(229)	(155)	(315)	(327)
Repayments of long-term debt		(600)	(2,350)	(600)	(3,349)
Repurchases of common stock		0	(405)	0	(1,071)
Tax withholdings on share-based awards		(4)	(10)	(104)	(84)
Cash payments for debt prepayment or debt extinguishment costs		(28)	(181)	(28)	(212)
Other, net		(5)	(3)	(9)	0
Net cash used in financing activities		(866)	(3,267)	(1,056)	(2,267)
Change in cash and cash equivalents		(334)	(2,312)	(98)	(1,004)
Cash and cash equivalents
Beginning of period		1,439	2,527	1,203	1,219
End of period		1,105	215	1,105	215
Supplemental disclosure of cash flow information
Interest payments, net of amounts capitalized		245	559	585	937
Operating lease payments	[1]	703	0	1,391
Income tax payments		40	10	72	11
Noncash investing and financing activities
Noncash beneficial interest obtained in exchange for securitized receivables		1,616	1,205	3,128	2,333
Changes in accounts payable for purchases of property and equipment		(113)	(386)	(446)	(750)
Leased devices transferred from inventory to property and equipment		167	280	314	584
Returned leased devices transferred from property and equipment to inventory		(67)	(90)	(124)	(172)
Short-term debt assumed for financing of property and equipment		50	54	300	291
Operating lease right-of-use assets obtained in exchange for lease obligations		1,400		2,094
Financing lease right-of-use assets obtained in exchange for lease obligations		$ 368	$ 176	$ 548	$ 318
[1]	On January 1, 2019, we adopted ASU 2016-02, “Leases (Topic 842),” which requires certain supplemental cash flow disclosures. Where these disclosures or a comparable figure were not required under the former lease standard, we have not retrospectively presented historical amounts. See Note 1 – Summary of Significant Accounting Policies for additional details.

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Cash Flows [Abstract]
Capitalized interest	$ 125	$ 102	$ 243	$ 145

Condensed Consolidated Statem_5

Condensed Consolidated Statement of Stockholders' Equity - USD ($) $ in Millions	Total	Common Stock Outstanding	Treasury Shares at Cost	Par Value and Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit
Balance, beginning of period at Dec. 31, 2017	$ 22,559		$ (4)	$ 38,629	$ 8	$ (16,074)
Common stock, shares outstanding, beginning (in shares) at Dec. 31, 2017		859,406,651
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,453					1,453
Other comprehensive loss	0
Stock-based compensation	234			234
Exercise of stock options	3			3
Exercise of stock options (in shares)		137,541
Stock issued for employee stock purchase plan	55			55
Stock issued for employee stock purchase plan (in shares)		1,069,495
Issuance of vested restricted stock units (in shares)		4,455,559
Issuance of restricted stock awards (in shares)		354,459
Shares withheld related to net share settlement of stock awards and stock options	(84)			(84)
Shares withheld related to net share settlement of stock awards and stock options (in shares)		(1,403,806)
Repurchases of common stock	(1,054)			(1,054)
Repurchases of common stock (in shares)		(16,738,758)
Transfer RSU to NQDC plan			(3)	3
Transfer RSU to NQDC plan (in shares)		(55,395)
Prior year retained earnings	224				(8)	232
Balance, end of period at Jun. 30, 2018	23,390		(7)	37,786	0	(14,389)
Common stock, shares outstanding, ending (in shares) at Jun. 30, 2018		847,225,746
Balance, beginning of period at Mar. 31, 2018	22,876		(7)	38,057	5	(15,179)
Common stock, shares outstanding, beginning (in shares) at Mar. 31, 2018		853,066,229
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	782					782
Other comprehensive loss	3				3
Stock-based compensation	126			126
Exercise of stock options	1			1
Exercise of stock options (in shares)		59,106
Stock issued for employee stock purchase plan (in shares)		(17)
Issuance of vested restricted stock units (in shares)		508,554
Shares withheld related to net share settlement of stock awards and stock options	(10)			(10)
Shares withheld related to net share settlement of stock awards and stock options (in shares)		(167,907)
Repurchases of common stock	(388)			(388)
Repurchases of common stock (in shares)		(6,240,219)
Prior year retained earnings					(8)	8
Balance, end of period at Jun. 30, 2018	23,390		(7)	37,786	0	(14,389)
Common stock, shares outstanding, ending (in shares) at Jun. 30, 2018		847,225,746
Balance, beginning of period at Dec. 31, 2018	$ 24,718		(6)	38,010	(332)	(12,954)
Common stock, shares outstanding, beginning (in shares) at Dec. 31, 2018	850,180,317	850,180,317
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 1,847					1,847
Other comprehensive loss	(481)				(481)
Stock-based compensation	264			264
Exercise of stock options	1			1
Exercise of stock options (in shares)		51,135
Stock issued for employee stock purchase plan	69			69
Stock issued for employee stock purchase plan (in shares)		1,135,801
Issuance of vested restricted stock units (in shares)		4,550,115
Forfeiture of restricted stock awards (in shares)		(20,769)
Shares withheld related to net share settlement of stock awards and stock options	(104)			(104)
Shares withheld related to net share settlement of stock awards and stock options (in shares)		(1,420,662)
Transfer RSU to NQDC plan			(2)	2
Transfer RSU to NQDC plan (in shares)		(23,295)
Prior year retained earnings	653					653
Balance, end of period at Jun. 30, 2019	$ 26,967		(8)	38,242	(813)	(10,454)
Common stock, shares outstanding, ending (in shares) at Jun. 30, 2019	854,452,642	854,452,642
Balance, beginning of period at Mar. 31, 2019	$ 26,181		(5)	38,100	(521)	(11,393)
Common stock, shares outstanding, beginning (in shares) at Mar. 31, 2019		854,380,118
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	939					939
Other comprehensive loss	(292)				(292)
Stock-based compensation	143			143
Exercise of stock options (in shares)		19,261
Stock issued for employee stock purchase plan (in shares)		(36,710)
Issuance of vested restricted stock units (in shares)		206,143
Forfeiture of restricted stock awards (in shares)		(20,769)
Shares withheld related to net share settlement of stock awards and stock options	(4)			(4)
Shares withheld related to net share settlement of stock awards and stock options (in shares)		(56,041)
Transfer RSU to NQDC plan			(3)	3
Transfer RSU to NQDC plan (in shares)		(39,360)
Balance, end of period at Jun. 30, 2019	$ 26,967		$ (8)	$ 38,242	$ (813)	$ (10,454)
Common stock, shares outstanding, ending (in shares) at Jun. 30, 2019	854,452,642	854,452,642

Summary of Significant Accounti

Summary of Significant Accounting Policies	6 Months Ended
	Jun. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Summary of Significant Accounting Policies	Note 1 – Summary of Significant Accounting Policies Basis of Presentation The unaudited condensed consolidated financial statements of T-Mobile US, Inc. (“T-Mobile,” “we,” “our,” “us” or “the Company”) include all adjustments of a normal recurring nature necessary for the fair presentation of the results for the interim periods presented. The results for the interim periods are not necessarily indicative of those for the full year. The condensed consolidated financial statements should be read in conjunction with our consolidated financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2018. The condensed consolidated financial statements include the balances and results of operations of T-Mobile and our consolidated subsidiaries. We consolidate majority-owned subsidiaries over which we exercise control, as well as variable interest entities (“VIE”) where we are deemed to be the primary beneficiary and VIEs which cannot be deconsolidated, such as those related to Tower obligations (Tower obligations are included in VIEs related to the 2012 Tower Transaction. See Note 8 - Tower Obligations for further information). Intercompany transactions and balances have been eliminated in consolidation. The preparation of financial statements in conformity with United States (“U.S.”) generally accepted accounting principles (“GAAP”) requires our management to make estimates and assumptions which affect the financial statements and accompanying notes. Estimates are based on historical experience, where applicable, and other assumptions which our management believes are reasonable under the circumstances. These estimates are inherently subject to judgment and actual results could differ from those estimates. Accounting Pronouncements Adopted During the Current Year Leases In February 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2016-02, “Leases (Topic 842),” and has since modified the standard with several ASUs (collectively, the “new lease standard”). The new lease standard is effective for us, and we adopted the standard, on January 1, 2019. We adopted the standard by recognizing and measuring leases at the adoption date with a cumulative effect of initially applying the guidance recognized at the date of initial application and as a result did not restate the prior periods presented in the Condensed Consolidated Financial Statements. The new lease standard provides for a number of optional practical expedients in transition. We did not elect the “package of practical expedients” and as a result reassessed under the new lease standard our prior accounting conclusions about lease identification, lease classification and initial direct costs. We elected to use hindsight for determining the reasonably certain lease term. We did not elect the practical expedient pertaining to land easements as it is not applicable to us. The new lease standard provides practical expedients and policy elections for an entity’s ongoing accounting. Generally, we elected the practical expedient to not separate lease and non-lease components in arrangements whereby we are the lessee. For arrangements in which we are lessor we did not elect this practical expedient. We did not elect the short-term lease recognition exemption, which includes the recognition of right-of-use assets and lease liabilities for existing short-term leases at transition. We have also applied this election to all active leases at transition. The most significant judgments and impacts upon adoption of the standard include the following: • In evaluating contracts to determine if they qualify as a lease, we consider factors such as if we have obtained or transferred substantially all of the rights to the underlying asset through exclusivity, if we can or if we have transferred the ability to direct the use of the asset by making decisions about how and for what purpose the asset will be used and if the lessor has substantive substitution rights. • We recognized right-of-use assets and operating lease liabilities for operating leases that have not previously been recorded. The lease liability for operating leases is based on the net present value of future minimum lease payments. The right-of-use asset for operating leases is based on the lease liability adjusted for the reclassification of certain balance sheet amounts such as prepaid rent and deferred rent, which we remeasured at adoption due to the application of hindsight to our lease term estimates. Deferred and prepaid rent will no longer be presented separately. • Capital lease assets previously included within Property and equipment, net were reclassified to financing lease right-of-use assets, and capital lease liabilities previously included in Short-term debt and Long-term debt were reclassified to financing lease liabilities in our Condensed Consolidated Balance Sheet. • Certain line items in the Condensed Consolidated Statements of Cash Flows and the “Supplementary disclosure of cash flow information” have been renamed to align with the new terminology presented in the new lease standard; “Repayment of capital lease obligations” is now presenting as “ Repayments of financing lease obligations ” and “Assets acquired under capital lease obligations” is now presenting as “Financing lease right-of-use assets obtained in exchange for lease obligations.” In the “Operating Activities” section of the Condensed Consolidated Statements of Cash Flows we have added “Operating lease right-of-use assets” and “Short and long-term operating lease liabilities” which represent the change in the operating lease asset and liability, respectively. Additionally, in the “Supplemental disclosure of cash flow information” section of the Condensed Consolidated Statements of Cash Flows we have added “Operating lease payments,” and in the “Noncash investing and financing activities” section we have added “Operating lease right-of-use assets obtained in exchange for lease obligations.” • In determining the discount rate used to measure the right-of-use asset and lease liability, we use rates implicit in the lease, or if not readily available, we use our incremental borrowing rate. Our incremental borrowing rate is based on an estimated secured rate comprised of a risk-free LIBOR rate plus a credit spread as secured by our assets. • Certain of our lease agreements include rental payments based on changes in the consumer price index (“CPI”). Lease liabilities are not remeasured as a result of changes in the CPI; instead, changes in the CPI are treated as variable lease payments and are excluded from the measurement of the right-of-use asset and lease liability. These payments are recognized in the period in which the related obligation was incurred. Our lease agreements do not contain any material residual value guarantees or material restrictive covenants. • We elected the use of hindsight whereby we applied current lease term assumptions that are applied to new leases in determining the expected lease term period for all cell sites. Upon adoption of the new lease standard and application of hindsight, our expected lease term has shortened to reflect payments due for the initial non-cancelable lease term only. This assessment corresponds to our lease term assessment for new leases and aligns with the payments that have been disclosed as lease commitments in prior years. As a result, the average remaining lease term for cell sites has decreased from approximately nine to five years based on lease contracts in effect at transition on January 1, 2019. The aggregate impact of using the hindsight is an estimated decrease in Total operating expense of $240 million in fiscal year 2019. • We were also required to reassess the previously failed sale-leasebacks of certain T-Mobile-owned wireless communication tower sites and determine whether the transfer of the assets to the tower operator under the arrangement met the transfer of control criteria in the revenue standard and whether a sale should be recognized. • We concluded that a sale has not occurred for the 6,200 tower sites transferred to Crown Castle International Corp. (“CCI”) pursuant to a master prepaid lease arrangement; therefore, these sites will continue to be accounted for as failed sale-leasebacks. • We concluded that a sale should be recognized for the 900 tower sites transferred to CCI pursuant to the sale of a subsidiary and for the 500 tower sites transferred to Phoenix Tower International (“PTI”). Upon adoption on January 1, 2019, we derecognized our existing long-term financial obligation and the tower-related property and equipment associated with these 1,400 previously failed sale-leaseback tower sites and recognized a lease liability and right-of-use asset for the leaseback of the tower sites. The estimated impacts from the change in accounting conclusion are primarily a decrease in Other revenues of $44 million and a decrease in Interest expense of $34 million in fiscal year 2019. • Rental revenues and expenses associated with co-location tower sites are presented on a net basis under the new lease standard. These revenues and expenses were presented on a gross basis under the former lease standard. Including the impacts from a change in the accounting conclusion on the 1,400 previously failed sale-leaseback tower sites, the cumulative effect of initially applying the new lease standard on January 1, 2019 is as follows: January 1, 2019 (in millions) Beginning Balance Cumulative Effect Adjustment Beginning Balance, As Adjusted Assets Other current assets $ 1,676 $ (78 ) $ 1,598 Property and equipment, net 23,359 (2,339 ) 21,020 Operating lease right-of-use assets — 9,251 9,251 Financing lease right-of-use assets — 2,271 2,271 Other intangible assets, net 198 (12 ) 186 Other assets 1,623 (71 ) 1,552 Liabilities and Stockholders’ Equity Accounts payable and accrued liabilities 7,741 (65 ) 7,676 Other current liabilities 787 28 815 Short-term and long-term debt 12,965 (2,015 ) 10,950 Tower obligations 2,557 (345 ) 2,212 Deferred tax liabilities 4,472 231 4,703 Deferred rent expense 2,781 (2,781 ) — Short-term and long-term operating lease liabilities — 11,364 11,364 Short-term and long-term financing lease liabilities — 2,016 2,016 Other long-term liabilities 967 (64 ) 903 Accumulated deficit $ (12,954 ) $ 653 $ (12,301 ) Including the impacts from the change in the accounting conclusion on the 1,400 previously failed sale-leaseback tower sites and the change in presentation on the income statement of the 6,200 tower sites for which a sale did not occur, the cumulative effects of initially applying the new lease standard for fiscal year 2019 are estimated as follows: • The aggregate impact is a decrease in Other revenues of $185 million , a decrease in Total operating expense s of $380 million , a decrease in Interest expense of $34 million and an increase to Net income of $175 million . • The expected impact on our Condensed Consolidated Statements of Cash Flows is a decrease in Net cash provided by operating activities of $10 million and a decrease in Net cash used in financing activities of $10 million . For arrangements where we are the lessor, including arrangements to lease devices to our service customers, the adoption of the new lease standard did not have a material impact on our financial statements as these leases are classified as operating leases. Device lease payments are presented as Equipment revenues and recognized as earned on a straight-line basis over the lease term. Recognition of equipment revenue on lease contracts that are determined to not be probable of collection are limited to the amount of payments received. We have made an accounting policy election to exclude from the consideration in the contract all taxes assessed by a governmental authority that are both imposed on and concurrent with a specific revenue-producing transaction and collected by us from a customer (for example, sales, use, value added, and some excise taxes). At operating lease inception, leased wireless devices are transferred from Inventory to Property and equipment, net. Leased wireless devices are depreciated to their estimated residual value over the period expected to provide utility to us, which is generally shorter than the lease term and considers expected losses. Returned devices transferred from Property and equipment, net, are recorded as Inventory and are valued at the lower of cost or market with any write-down to market recognized as Cost of equipment sales in our Consolidated Statements of Comprehensive Income. We do not have any leasing transactions with related parties. See Note 11 - Leases for further information. We have implemented significant new lease accounting systems, processes and internal controls over lease accounting to assist us in the application of the new lease standard. Accounting Pronouncements Not Yet Adopted Financial Instruments In June 2016, the FASB issued ASU 2016-13, “Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments,” and has since modified the standard with several ASUs (collectively, the “new credit loss standard”). The new credit loss standard requires a financial asset (or a group of financial assets) measured at amortized cost basis to be presented at the net amount expected to be collected. The measurement of expected credit losses is based on relevant information about past events, including historical experience, current conditions and reasonable and supportable forecasts that affect the collectibility of the reported amount. The new credit loss standard will become effective for us beginning January 1, 2020, and will require a cumulative-effect adjustment to Accumulated deficit as of the beginning of the first reporting period in which the guidance is effective (that is, a modified-retrospective approach). We are in the process of developing an expected credit loss model, identifying forward-looking loss indicators and assessing the impact on our receivables portfolio. We will adopt the new credit loss standard on January 1, 2020. Cloud Computing Arrangements In August 2018, the FASB issued ASU 2018-15, “Intangibles - Goodwill and Other - Internal-Use Software (Topic 350): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement that is a Service Contract.” The standard aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software. The standard will become effective for us beginning January 1, 2020, and can be applied either retrospectively or prospectively to all implementation costs incurred after the date of adoption. We are currently evaluating the impact this guidance will have on our Consolidated Financial Statements. We will adopt the standard on January 1, 2020. Other recent accounting pronouncements issued by the FASB (including its Emerging Issues Task Force), the American Institute of Certified Public Accountants, and the Securities and Exchange Commission (the “SEC”) did not have, or are not expected to have, a significant impact on our present or future Consolidated Financial Statements.

Significant Transactions

Significant Transactions	6 Months Ended
	Jun. 30, 2019
Significant Transactions Disclosure [Abstract]
Significant Transactions	Note 2 - Significant Transactions Business Combinations Proposed Sprint Transaction On April 29, 2018, we entered into a Business Combination Agreement (as amended, the “Business Combination Agreement”) to merge with Sprint Corporation (“Sprint”). See Note 3 - Business Combinations for further information. Sales of Certain Receivables In February 2019, the service receivable sale arrangement was amended to extend the scheduled expiration date, as well as extend certain third-party credit support under the arrangement, to March 2021. See Note 5 – Sales of Certain Receivables for further information. Note Redemption Effective April 28, 2019, we redeemed $600 million aggregate principal amount of our 9.332% Senior Reset Notes due 2023 (the “DT Senior Reset Notes”) held by Deutsche Telekom AG (“DT”), our majority stockholder. The notes were redeemed at a redemption price equal to 104.666% of the principal amount of the notes (plus accrued and unpaid interest thereon) and were paid on April 29, 2019. The redemption premium was $28 million and was included in Other expense, net in our Condensed Consolidated Statements of Comprehensive Income and in Cash payments for debt prepayment or debt extinguishment costs in our Condensed Consolidated Statements of Cash Flows . Certain components of the reset features were required to be bifurcated from the DT Senior Reset Notes and were separately accounted for as embedded derivatives. The write-off of embedded derivatives upon redemption resulted in a gain of $11 million which was included in Other expense, net in our Condensed Consolidated Statements of Comprehensive Income . See Note 7 - Fair Value Measurements for further information.

Business Combinations

Business Combinations	6 Months Ended
	Jun. 30, 2019
Business Combinations [Abstract]
Business Combinations	Note 3 – Business Combinations Proposed Sprint Transactions On April 29, 2018, we entered into a Business Combination Agreement to merge with Sprint in an all-stock transaction at a fixed exchange ratio of 0.10256 shares of T-Mobile common stock for each share of Sprint common stock, or 9.75 shares of Sprint common stock for each share of T-Mobile common stock (the “Merger”). The combined company will be named “T-Mobile” and, as a result of the Merger, is expected to be able to rapidly launch a broad and deep nationwide 5G network, accelerate innovation and increase competition in the U.S. wireless, video and broadband industries. Neither T-Mobile nor Sprint on its own could generate comparable benefits to consumers. The Merger and the other transactions contemplated by the Business Combination Agreement (collectively, the “Transactions”) have been approved by the boards of directors of T-Mobile and Sprint and the required approvals of the stockholders of each of T-Mobile and Sprint have been obtained. Immediately following the Merger, it is anticipated that DT and SoftBank Group Corp. (“SoftBank”) will hold, directly or indirectly, on a fully diluted basis, approximately 41.7% and 27.4% , respectively, of the outstanding T-Mobile common stock, with the remaining approximately 30.9% of the outstanding T-Mobile common stock held by other stockholders, based on closing share prices and certain other assumptions as of December 31, 2018. In connection with the entry into the Business Combination Agreement, T-Mobile USA, Inc. (“T-Mobile USA”) entered into a commitment letter, dated as of April 29, 2018 (as amended and restated on May 15, 2018, the “Commitment Letter”). The funding of the debt facilities provided for in the Commitment Letter is subject to the satisfaction of the conditions set forth therein, including consummation of the Merger. The proceeds of the debt financing provided for in the Commitment Letter will be used to refinance certain existing debt of us, Sprint and our and Sprint’s respective subsidiaries and for post-closing working capital needs of the combined company. In connection with the financing provided for in the Commitment Letter, we expect to incur certain fees if the Merger is consummated. There were no fees accrued as of June 30, 2019 . We also may be required to draw down on the $7 billion secured term loan facility prior to closing of the Merger and, if so, will be required to place the proceeds in escrow and pay interest thereon until the Merger closes. In connection with the entry into the Business Combination Agreement, DT and T-Mobile USA entered into a financing matters agreement, dated as of April 29, 2018, pursuant to which DT agreed, among other things, to consent to the incurrence by T-Mobile USA of secured debt in connection with and after the consummation of the Merger. If the Merger is consummated, we will make payments for requisite consents to DT. There were no consent payments accrued as of June 30, 2019 . On May 18, 2018, under the terms and conditions described in the Consent Solicitation Statement dated as of May 14, 2018, we obtained consents necessary to effect certain amendments to certain existing debt of us and our subsidiaries. If the Merger is consummated, we will make payments for requisite consents to third-party note holders. There were no consent payments accrued as of June 30, 2019 . Under the terms of the Business Combination Agreement, Sprint may be required to reimburse us for 33% of the upfront consent and related bank fees we paid, or $14 million , if the Business Combination Agreement is terminated. There were no reimbursements accrued as of June 30, 2019 . On May 18, 2018, Sprint also obtained consents necessary to effect certain amendments to certain existing debt of Sprint and its subsidiaries. Under the terms of the Business Combination Agreement, we may also be required to reimburse Sprint for 67% of the upfront consent and related bank fees it paid, or $162 million , if the Business Combination Agreement is terminated. There were no fees accrued as of June 30, 2019 . We recognized merger-related costs of $222 million and $41 million for the three months ended June 30, 2019 and 2018 , respectively, and $335 million and $41 million for the six months ended June 30, 2019 and 2018 , respectively. These costs generally included consulting and legal fees and were recognized as Selling, general and administrative expenses in our Condensed Consolidated Statements of Comprehensive Income . The consummation of the Transactions remains subject to regulatory approvals and certain other customary closing conditions. We expect to receive final federal regulatory approval in the third quarter of 2019 and currently anticipate that the Transactions will be permitted to close in the second half of the year. The Business Combination Agreement contains certain termination rights for both Sprint and us. If we terminate the Business Combination Agreement in connection with a failure to satisfy the closing condition related to specified minimum credit ratings for the combined company on the closing date of the Merger (after giving effect to the Merger) from at least two of the three credit rating agencies, then in certain circumstances, we may be required to pay Sprint an amount equal to $600 million . On June 18, 2018, we filed the Public Interest Statement and applications for approval of the Merger with the Federal Communications Commission (“FCC”). On July 18, 2018, the FCC issued a Public Notice formally accepting our applications and establishing a period for public comment. On May 20, 2019, to facilitate the FCC’s review and approval of the FCC license transfers associated with the proposed Merger, we and Sprint filed with the FCC a written ex parte presentation (the “Presentation”) relating to the proposed Merger. The Presentation included proposed commitments from us and Sprint. Following the Presentation, we received statements of support for the Merger by the FCC Chairman Ajit Pai and Commissioners Carr and O’Rielly. Formal action on the Merger by the FCC remains pending. On June 11, 2019, the attorneys general of nine states and the District of Columbia filed a lawsuit against us, DT, Sprint, and Softbank Group Corp. in the U.S. District Court for the Southern District of New York. On June 25, 2019, the plaintiffs filed an amended complaint including as plaintiffs four additional state attorneys general. Plaintiffs’ amended complaint alleges that the Merger, if consummated, would violate Section 7 of the Clayton Act and should be enjoined. We and the other defendants answered plaintiffs’ amended complaint on July 9, 2019, and discovery is ongoing. We believe the plaintiffs’ claims are without merit, and we intend to defend the lawsuit vigorously. On July 26, 2019, we entered into an Asset Purchase Agreement (the “Asset Purchase Agreement”) with Sprint and DISH Network Corporation (“DISH”). We and Sprint are collectively referred to as the “Sellers.” Pursuant to the Asset Purchase Agreement, upon the terms and subject to the conditions thereof, following the consummation of the Merger, DISH will acquire Sprint’s prepaid wireless business, currently operated under the Boost Mobile, Virgin Mobile and Sprint prepaid brands (excluding the Assurance brand Lifeline customers and the prepaid wireless customers of Shenandoah Telecommunications Company and Swiftel Communications, Inc.), including customer accounts, inventory, contracts, intellectual property and certain other specified assets (the “Prepaid Business”), and will assume certain related liabilities (the “Prepaid Transaction”). DISH will pay the Sellers $1.4 billion for the Prepaid Business, subject to a working capital adjustment. The consummation of the Prepaid Transaction is subject to the consummation of the Merger and other customary closing conditions. At the closing of the Prepaid Transaction, the Sellers and DISH will enter into (i) a License Purchase Agreement pursuant to which (a) the Sellers will sell certain 800 MHz spectrum licenses held by Sprint to DISH for a total of approximately $3.6 billion in a transaction to be completed, subject to certain additional closing conditions, following an application for FCC approval to be filed three years following the closing of the Merger and (b) the Sellers will have the option to lease back from DISH, as needed, a portion of the spectrum sold for an additional two years following the closing of the spectrum sale transaction, (ii) a Transition Services Agreement providing for the Sellers’ provision of transition services to DISH in connection with the Prepaid Business for a period of up to three years following the closing of the Prepaid Transaction, (iii) a Master Network Services Agreement providing for the Sellers’ provision of network services to customers of the Prepaid Business for a period of up to seven years following the closing of the Prepaid Transaction, and (iv) an Option to Acquire Tower and Retail Assets offering DISH the option to acquire certain decommissioned towers and retail locations from the Sellers, subject to obtaining all necessary third-party consents, for a period of up to five years following the closing of the Prepaid Transaction. On July 26, 2019, in connection with the entry into the Asset Purchase Agreement, we and the other parties to the Business Combination Agreement entered into Amendment No. 1 (the “Amendment”) to the Business Combination Agreement. The Amendment extends the Outside Date (as defined in the Business Combination Agreement) to November 1, 2019, or, if the Marketing Period (as defined in the Business Combination Agreement) has started and is in effect at such date, then January 2, 2020. The Amendment also provides that the closing of the Merger will occur on the first business day of the first month (other than the third month of any calendar quarter) where such first business day is at least three business days following the satisfaction or waiver of all of the conditions to the closing of the Merger, or, if the Marketing Period has not ended at the time of such satisfaction or waiver, the closing shall occur on the earlier of (a) any date during or after the Marketing Period specified by T-Mobile (subject to the consent of Sprint to the extent such date falls after the Outside Date) or (b) the first business day of the first month (other than the third month of any calendar quarter) where such first business day is at least three business days following the final day of the Marketing Period. The Amendment also modifies the Business Combination Agreement so as to limit the actions the parties may be required to undertake or agree to in order to obtain any remaining governmental consents or avoid an action or proceeding by any governmental entity in connection with the Transactions, recognizing the substantial undertakings already agreed to by the parties, including the transactions contemplated by the Asset Purchase Agreement. On July 26, 2019, the U.S. Department of Justice (the “DOJ”) filed a complaint and a proposed final judgment (the “Proposed Consent Decree”) agreed to by us, DT, Sprint, SoftBank and DISH with the U.S. District Court for the District of Columbia. The Proposed Consent Decree would fully resolve DOJ’s investigation into the Merger and would require the parties to, among other things, carry out the divestitures to be made pursuant to the Asset Purchase Agreement described above upon closing of the Merger. The Proposed Consent Decree is subject to judicial approval. The consummation of the Merger remains subject to regulatory approvals and certain other customary closing conditions. We expect to receive final federal regulatory approval in the third quarter of 2019 and currently anticipate that the Merger will be permitted to close in the second half of the year.

Receivables and Allowance for C

Receivables and Allowance for Credit Losses	6 Months Ended
	Jun. 30, 2019
Receivables [Abstract]
Receivables and Allowance for Credit Losses	Note 4 – Receivables and Allowance for Credit Losses Our portfolio of receivables is comprised of two portfolio segments, accounts receivable and EIP receivables. Our accounts receivable segment primarily consists of amounts currently due from customers, including service and leased device receivables, other carriers and third-party retail channels. Based upon customer credit profiles, we classify the EIP receivables segment into two customer classes of “Prime” and “Subprime.” Prime customer receivables are those with lower delinquency risk and Subprime customer receivables are those with higher delinquency risk. Customers may be required to make a down payment on their equipment purchases. In addition, certain customers within the Subprime category are required to pay an advance deposit. To determine a customer’s credit profile, we use a proprietary credit scoring model that measures the credit quality of a customer using several factors, such as credit bureau information, consumer credit risk scores and service and device plan characteristics. The following table summarizes the EIP receivables, including imputed discounts and related allowance for credit losses: (in millions) June 30, December 31, EIP receivables, gross $ 4,490 $ 4,534 Unamortized imputed discount (335 ) (330 ) EIP receivables, net of unamortized imputed discount 4,155 4,204 Allowance for credit losses (105 ) (119 ) EIP receivables, net $ 4,050 $ 4,085 Classified on the balance sheet as: Equipment installment plan receivables, net $ 2,446 $ 2,538 Equipment installment plan receivables due after one year, net 1,604 1,547 EIP receivables, net $ 4,050 $ 4,085 To determine the appropriate level of the allowance for credit losses, we consider a number of credit quality indicators, including historical credit losses and timely payment experience as well as current collection trends such as write-off frequency and severity, aging of the receivable portfolio, credit quality of the customer base and other qualitative factors such as macro-economic conditions. We write off account balances if collection efforts are unsuccessful and the receivable balance is deemed uncollectible, based on customer credit quality and the aging of the receivable. For EIP receivables, subsequent to the initial determination of the imputed discount, we assess the need for and, if necessary, recognize an allowance for credit losses to the extent the amount of estimated probable losses on the gross EIP receivable balances exceed the remaining unamortized imputed discount balances. The EIP receivables had weighted average effective imputed interest rates of 9.6% and 10.0% as of June 30, 2019 , and December 31, 2018 , respectively. Activity for the six months ended June 30, 2019 and 2018 , in the allowance for credit losses and unamortized imputed discount balances for the accounts receivable and EIP receivables segments were as follows: June 30, 2019 June 30, 2018 (in millions) Accounts Receivable Allowance EIP Receivables Allowance Total Accounts Receivable Allowance EIP Receivables Allowance Total Allowance for credit losses and imputed discount, beginning of period $ 67 $ 449 $ 516 $ 86 $ 396 $ 482 Bad debt expense 31 113 144 25 103 128 Write-offs, net of recoveries (37 ) (127 ) (164 ) (41 ) (119 ) (160 ) Change in imputed discount on short-term and long-term EIP receivables N/A 89 89 N/A 102 102 Impact on the imputed discount from sales of EIP receivables N/A (84 ) (84 ) N/A (98 ) (98 ) Allowance for credit losses and imputed discount, end of period $ 61 $ 440 $ 501 $ 70 $ 384 $ 454 Management considers the aging of receivables to be an important credit indicator. The following table provides delinquency status for the unpaid principal balance for receivables within the EIP portfolio segment, which we actively monitor as part of our current credit risk management practices and policies: June 30, 2019 December 31, 2018 (in millions) Prime Subprime Total EIP Receivables, gross Prime Subprime Total EIP Receivables, gross Current - 30 days past due $ 2,222 $ 2,177 $ 4,399 $ 1,987 $ 2,446 $ 4,433 31 - 60 days past due 14 30 44 15 32 47 61 - 90 days past due 6 17 23 6 19 25 More than 90 days past due 7 17 24 7 22 29 Total receivables, gross $ 2,249 $ 2,241 $ 4,490 $ 2,015 $ 2,519 $ 4,534

Sales of Certain Receivables

Sales of Certain Receivables	6 Months Ended
	Jun. 30, 2019
Transfers and Servicing [Abstract]
Sales of Certain Receivables	Note 5 – Sales of Certain Receivables We have entered into transactions to sell certain service and EIP receivables. The transactions, including our continuing involvement with the sold receivables and the respective impacts to our condensed consolidated financial statements , are described below. Sales of Service Accounts Receivable Overview of the Transaction In 2014, we entered into an arrangement to sell certain service accounts receivable on a revolving basis (the “service receivable sale arrangement”). The maximum funding commitment of the service receivable sale arrangement is $950 million . In February 2019, the service receivable sale arrangement was amended to extend the scheduled expiration date, as well as certain third-party credit support under the arrangement, to March 2021. As of June 30, 2019 and December 31, 2018 , the service receivable sale arrangement provided funding of $950 million and $774 million , respectively. Sales of receivables occur daily and are settled on a monthly basis. The receivables consist of service charges currently due from customers and are short-term in nature. In connection with the service receivable sale arrangement, we formed a wholly-owned subsidiary, which qualifies as a bankruptcy remote entity, to sell service accounts receivable (the “Service BRE”). The Service BRE does not qualify as a VIE, and due to the significant level of control we exercise over the entity, it is consolidated. Pursuant to the service receivable sale arrangement, certain of our wholly-owned subsidiaries transfer selected receivables to the Service BRE. The Service BRE then sells the receivables to an unaffiliated entity (the “Service VIE”), which was established to facilitate the sale of beneficial ownership interests in the receivables to certain third parties. Variable Interest Entity We determined that the Service VIE qualifies as a VIE as it lacks sufficient equity to finance its activities. We have a variable interest in the Service VIE but are not the primary beneficiary as we lack the power to direct the activities that most significantly impact the Service VIE’s economic performance. Those activities include committing the Service VIE to legal agreements to purchase or sell assets, selecting which receivables are purchased in the service receivable sale arrangement, determining whether the Service VIE will sell interests in the purchased service receivables to other parties, funding of the entity and servicing of receivables. We do not hold the power to direct the key decisions underlying these activities. For example, while we act as the servicer of the sold receivables, which is considered a significant activity of the Service VIE, we are acting as an agent in our capacity as the servicer and the counterparty to the service receivable sale arrangement has the ability to remove us as the servicing agent of the receivables at will with no recourse available to us. As we have determined we are not the primary beneficiary, the balances and results of the Service VIE are not included in our condensed consolidated financial statements . The following table summarizes the carrying amounts and classification of assets, which consists primarily of the deferred purchase price and liabilities included in our Condensed Consolidated Balance Sheets that relate to our variable interest in the Service VIE: (in millions) June 30, December 31, Other current assets $ 351 $ 339 Accounts payable and accrued liabilities — 59 Other current liabilities 293 149 Sales of EIP Receivables Overview of the Transaction In 2015, we entered into an arrangement to sell certain EIP accounts receivable on a revolving basis (the “EIP sale arrangement”). The maximum funding commitment of the EIP sale arrangement is $1.3 billion , and the scheduled expiration date is November 2020. As of both June 30, 2019 and December 31, 2018 , the EIP sale arrangement provided funding of $1.3 billion . Sales of EIP receivables occur daily and are settled on a monthly basis. In connection with this EIP sale arrangement, we formed a wholly-owned subsidiary, which qualifies as a bankruptcy remote entity (the “EIP BRE”). Pursuant to the EIP sale arrangement, our wholly-owned subsidiary transfers selected receivables to the EIP BRE. The EIP BRE then sells the receivables to a non-consolidated and unaffiliated third-party entity for which we do not exercise any level of control, nor does the third-party entity qualify as a VIE. Variable Interest Entity We determined that the EIP BRE is a VIE as its equity investment at risk lacks the obligation to absorb a certain portion of its expected losses. We have a variable interest in the EIP BRE and determined that we are the primary beneficiary based on our ability to direct the activities which most significantly impact the EIP BRE’s economic performance. Those activities include selecting which receivables are transferred into the EIP BRE and sold in the EIP sale arrangement and funding of the EIP BRE. Additionally, our equity interest in the EIP BRE obligates us to absorb losses and gives us the right to receive benefits from the EIP BRE that could potentially be significant to the EIP BRE. Accordingly, we include the balances and results of operations of the EIP BRE in our condensed consolidated financial statements . The following table summarizes the carrying amounts and classification of assets, which consists primarily of the deferred purchase price and liabilities included in our Condensed Consolidated Balance Sheets that relate to the EIP BRE: (in millions) June 30, December 31, Other current assets $ 340 $ 321 Other assets 74 88 Other long-term liabilities 23 22 In addition, the EIP BRE is a separate legal entity with its own separate creditors who will be entitled, prior to any liquidation of the EIP BRE, to be satisfied prior to any value in the EIP BRE becoming available to us. Accordingly, the assets of the EIP BRE may not be used to settle our general obligations and creditors of the EIP BRE have limited recourse to our general credit. Sales of Receivables The transfers of service receivables and EIP receivables to the non-consolidated entities are accounted for as sales of financial assets. Once identified for sale, the receivable is recorded at the lower of cost or fair value. Upon sale, we derecognize the net carrying amount of the receivables. We recognize the cash proceeds received upon sale in Net cash provided by operating activities in our Condensed Consolidated Statements of Cash Flows . We recognize proceeds net of the deferred purchase price, consisting of a receivable from the purchasers that entitles us to certain collections on the receivables. We recognize the collection of the deferred purchase price in Net cash used in investing activities in our Condensed Consolidated Statements of Cash Flows as Proceeds related to beneficial interests in securitization transactions . The deferred purchase price represents a financial asset that is primarily tied to the creditworthiness of the customers and which can be settled in such a way that we may not recover substantially all of our recorded investment, due to default by the customers on the underlying receivables. We elected, at inception, to measure the deferred purchase price at fair value with changes in fair value included in Selling, general and administrative expense in our Condensed Consolidated Statements of Comprehensive Income . The fair value of the deferred purchase price is determined based on a discounted cash flow model which uses primarily unobservable inputs (Level 3 inputs), including customer default rates. As of June 30, 2019 , and December 31, 2018 , our deferred purchase price related to the sales of service receivables and EIP receivables was $763 million and $746 million , respectively. The following table summarizes the impact of the sale of certain service receivables and EIP receivables in our Condensed Consolidated Balance Sheets : (in millions) June 30, December 31, Derecognized net service receivables and EIP receivables $ 2,616 $ 2,577 Other current assets 691 660 of which, deferred purchase price 689 658 Other long-term assets 74 88 of which, deferred purchase price 74 88 Accounts payable and accrued liabilities — 59 Other current liabilities 293 149 Other long-term liabilities 23 22 Net cash proceeds since inception 1,956 1,879 Of which: Change in net cash proceeds during the year-to-date period 77 (179 ) Net cash proceeds funded by reinvested collections 1,879 2,058 We recognized losses from sales of receivables, including adjustments to the receivables’ fair values and changes in fair value of the deferred purchase price, of $28 million and $27 million for the three months ended June 30, 2019 and 2018 , and $63 million and $79 million for the six months ended June 30, 2019 and 2018 , respectively, in Selling, general and administrative expense in our Condensed Consolidated Statements of Comprehensive Income . Continuing Involvement Pursuant to the sale arrangements described above, we have continuing involvement with the service receivables and EIP receivables we sell as we service the receivables and are required to repurchase certain receivables, including ineligible receivables, aged receivables and receivables where write-off is imminent. We continue to service the customers and their related receivables, including facilitating customer payment collection, in exchange for a monthly servicing fee. As the receivables are sold on a revolving basis, the customer payment collections on sold receivables may be reinvested in new receivable sales. While servicing the receivables, we apply the same policies and procedures to the sold receivables as we apply to our owned receivables, and we continue to maintain normal relationships with our customers. Pursuant to the EIP sale arrangement, under certain circumstances, we are required to deposit cash or replacement EIP receivables primarily for contracts terminated by customers under our JUMP! Program. In addition, we have continuing involvement with the sold receivables as we may be responsible for absorbing additional credit losses pursuant to the sale arrangements. Our maximum exposure to loss related to the involvement with the service receivables and EIP receivables sold under the sale arrangements was $1.1 billion as of June 30, 2019 . The maximum exposure to loss, which is a required disclosure under U.S. GAAP, represents an estimated loss that would be incurred under severe, hypothetical circumstances whereby we would not receive the deferred purchase price portion of the contractual proceeds withheld by the purchasers and would also be required to repurchase the maximum amount of receivables pursuant to the sale arrangements without consideration for any recovery. We believe the probability of these circumstances occurring is remote and the maximum exposure to loss is not an indication of our expected loss.

Spectrum License Transactions

Spectrum License Transactions	6 Months Ended
	Jun. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Spectrum License Transactions	Note 6 – Spectrum License Transactions Spectrum Licenses The following table summarizes our spectrum license activity for the six months ended June 30, 2019 : (in millions) 2019 Balance at December 31, 2018 $ 35,559 Spectrum license acquisitions 857 Spectrum licenses transferred to held for sale — Costs to clear spectrum 14 Balance at June 30, 2019 $ 36,430 The following is a summary of significant spectrum transactions for the six months ended June 30, 2019 : Millimeter Wave Spectrum Auctions In June 2019, the FCC announced that we were the winning bidder of 2,211 licenses in the 24 GHz and 28 GHz spectrum auction for an aggregate price of $842 million . At the inception of the 28 GHz spectrum auction in October 2018, we deposited $20 million with the FCC. Upon conclusion of the 28 GHz spectrum auction in February 2019, we made an additional payment of $19 million for the purchase price of licenses won in the auction. At the inception of the 24 GHz spectrum auction in February 2019, we deposited $147 million with the FCC. Upon conclusion of the 24 GHz spectrum auction in June 2019, we made an additional payment of $656 million for the purchase price of licenses won in the auction. The licenses are included in Spectrum licenses as of June 30, 2019 , in our Condensed Consolidated Balance Sheets . Cash payments to acquire spectrum licenses and payments for costs to clear spectrum are included in Purchases of spectrum licenses and other intangible assets, including deposits in our Condensed Consolidated Statements of Cash Flows for the three and six months ended June 30, 2019 .

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2019
Fair Value Disclosures [Abstract]
Fair Value Measurements	Note 7 – Fair Value Measurements The carrying values of Cash and cash equivalents , Accounts receivable, Accounts receivable from affiliates , Accounts payable and accrued liabilities , and borrowings under our revolving credit facility with DT, our majority stockholder, approximate fair value due to the short-term maturities of these instruments. Derivative Financial Instruments Interest rate lock derivatives Periodically, we use derivatives to manage exposure to market risk, such as interest rate risk. We designate certain derivatives as hedging instruments in a qualifying hedge accounting relationship (cash flow hedge) to help minimize significant, unplanned fluctuations in cash flows caused by interest rate volatility. We do not use derivatives for trading or speculative purposes. We record interest rate lock derivatives on our Condensed Consolidated Balance Sheets at fair value that is derived primarily from observable market data, including yield curves. Interest rate lock derivatives were classified as Level 2 in the fair value hierarchy. Cash flows associated with qualifying hedge derivative instruments are presented in the same category on the Condensed Consolidated Statements of Cash Flows as the item being hedged. In October 2018, we entered into interest rate lock derivatives with notional amounts of $9.6 billion . The fair value of interest rate lock derivatives was a liability of $1.1 billion and $447 million as of June 30, 2019 and December 31, 2018, respectively, and were included in Other current liabilities in our Condensed Consolidated Balance Sheets . As of and for the three and six months ended June 30, 2019 , no amounts were accrued or amortized into Interest expense in the Condensed Consolidated Statements of Comprehensive Income . Aggregate changes in fair value, net of tax, of $813 million and $332 million are presented in Accumulated other comprehensive loss as of June 30, 2019 , and December 31, 2018, respectively. The interest rate lock derivatives will be settled upon the issuance of fixed-rate debt, expected to occur prior to December 31, 2020. Upon settlement of the interest rate lock derivatives, we will receive, or make, a cash payment in the amount of the fair value of the cash flow hedge as of the settlement date. There were no cash payments or receipts associated with these derivatives for the three and six months ended June 30, 2019 . Embedded derivatives Effective April 28, 2019, we redeemed $600 million aggregate principal amount of our 9.332% Senior Reset Notes due 2023 held by DT. The notes were redeemed at a redemption price equal to 104.666% of the principal amount of the notes (plus accrued and unpaid interest thereon) and were paid on April 29, 2019. The write-off of embedded derivatives upon redemption of the DT Senior Reset Notes resulted in a gain of $11 million , which was included in Other expense, net in our Condensed Consolidated Statements of Comprehensive Income . Deferred Purchase Price Assets In connection with the sales of certain service and EIP accounts receivable pursuant to the sale arrangements, we have deferred purchase price assets measured at fair value that are based on a discounted cash flow model using unobservable Level 3 inputs, including customer default rates. See Note 5 – Sales of Certain Receivables for further information. The carrying amounts and fair values of our assets measured at fair value on a recurring basis included in our Condensed Consolidated Balance Sheets were as follows: Level within the Fair Value Hierarchy June 30, 2019 December 31, 2018 (in millions) Carrying Amount Fair Value Carrying Amount Fair Value Assets: Deferred purchase price assets 3 $ 763 $ 763 $ 746 $ 746 Long-term Debt The fair value of our Senior Notes to third parties was determined based on quoted market prices in active markets, and therefore was classified as Level 1 within the fair value hierarchy. The fair values of our Senior Notes to affiliates , Incremental Term Loan Facility to affiliates and Senior Reset Notes to affiliates were determined based on a discounted cash flow approach using market interest rates of instruments with similar terms and maturities and an estimate for our standalone credit risk. Accordingly, our Senior Notes to affiliates , Incremental Term Loan Facility to affiliates and Senior Reset Notes to affiliates were classified as Level 2 within the fair value hierarchy. Although we have determined the estimated fair values using available market information and commonly accepted valuation methodologies, considerable judgment was required in interpreting market data to develop fair value estimates for the Senior Notes to affiliates , Incremental Term Loan Facility to affiliates and Senior Reset Notes to affiliates . The fair value estimates were based on information available as of June 30, 2019 , and December 31, 2018 . As such, our estimates are not necessarily indicative of the amount we could realize in a current market exchange. The carrying amounts and fair values of our short-term and long-term debt included in our Condensed Consolidated Balance Sheets were as follows: Level within the Fair Value Hierarchy June 30, 2019 December 31, 2018 (in millions) Carrying Amount Fair Value Carrying Amount Fair Value Liabilities: Senior Notes to third parties 1 $ 10,954 $ 11,485 $ 10,950 $ 10,945 Senior Notes to affiliates 2 9,985 10,344 9,984 9,802 Incremental Term Loan Facility to affiliates 2 4,000 4,000 4,000 3,976 Senior Reset Notes to affiliates 2 — — 598 640 Guarantee Liabilities We offer a device trade-in program, JUMP!, which provides eligible customers a specified-price trade-in right to upgrade their device. For customers who enroll in JUMP!, we recognize a liability and reduce revenue for the portion of revenue which represents the estimated fair value of the specified-price trade-in right guarantee, incorporating the expected probability and timing of handset upgrade and the estimated fair value of the handset which is returned. Accordingly, our guarantee liabilities were classified as Level 3 within the fair value hierarchy. When customers upgrade their device, the difference between the EIP balance credit to the customer and the fair value of the returned device is recorded against the guarantee liabilities. Guarantee liabilities are included in Other current liabilities in our Consolidated Balance Sheets. The carrying amounts of our guarantee liabilities measured at fair value on a non-recurring basis included in our Condensed Consolidated Balance Sheets were $71 million and $73 million as of June 30, 2019 , and December 31, 2018 , respectively. The total estimated remaining gross EIP receivable balances of all enrolled handset upgrade program customers, which are the remaining EIP amounts underlying the JUMP! guarantee, including EIP receivables that have been sold, was $3.0 billion as of June 30, 2019 . This is not an indication of our expected loss exposure as it does not consider the expected fair value of the used handset or the probability and timing of the trade-in.

Tower Obligations

Tower Obligations	6 Months Ended
	Jun. 30, 2019
Leases [Abstract]
Tower Obligations	Note 8 – Tower Obligations In 2012, we conveyed to CCI the exclusive right to manage and operate approximately 7,100 T-Mobile-owned wireless communication tower sites (“CCI Tower Sites”) in exchange for net proceeds of $2.5 billion (the “2012 Tower Transaction”). Rights to approximately 6,200 of the tower sites were transferred to CCI via a master prepaid lease with site lease terms ranging from 23 to 37 years (“CCI Lease Sites”), while the remaining tower sites were sold to CCI (“CCI Sales Sites”). CCI has fixed-price purchase options for the CCI Lease Sites totaling approximately $2.0 billion , exercisable at the end of the lease term. We lease back space at certain tower sites for an initial term of ten years , followed by optional renewals at customary terms. In 2015, we conveyed to PTI the exclusive right to manage and operate certain T-Mobile-owned wireless communication tower sites (“PTI Sales Sites”) in exchange for net proceeds of approximately $140 million (the “2015 Tower Transaction”). As of June 30, 2019 , rights to approximately 150 of the tower sites remain operated by PTI under a management agreement (“PTI Managed Sites”). We lease back space at certain tower sites for an initial term of ten years , followed by optional renewals at customary terms. Assets and liabilities associated with the operation of the tower sites were transferred to special purpose entities (“SPEs”). Assets included ground lease agreements or deeds for the land on which the towers are situated, the towers themselves and existing subleasing agreements with other mobile network operator tenants, who lease space at the tower sites. Liabilities included the obligation to pay ground lease rentals, property taxes and other executory costs. Upon closing of the 2012 Tower Transaction, CCI acquired all of the equity interests in the SPE containing CCI Sales Sites and an option to acquire the CCI Lease Sites at the end of their respective lease terms and entered into a master lease agreement under which we agreed to lease back space at certain of the tower sites. Upon closing of the 2015 Tower Transaction, PTI acquired all of the equity interests in the SPEs containing PTI Sales Sites and entered into a master lease agreement under which we agreed to lease back space at certain of the tower sites. We determined the SPEs containing the CCI Lease Sites (“Lease Site SPEs”) are VIEs as our equity investment lacks the power to direct the activities that most significantly impact the economic performance of the VIEs. These activities include managing tenants and underlying ground leases, performing repair and maintenance on the towers, the obligation to absorb expected losses and the right to receive the expected future residual returns from the purchase option to acquire the CCI Lease Sites. As we determined that we are not the primary beneficiary and do not have a controlling financial interest in the Lease Site SPEs, the balances and operating results of the Lease Site SPEs are not included in our condensed consolidated financial statements . Due to our continuing involvement with the tower sites, we previously determined that we were precluded from applying sale-leaseback accounting. We recorded long-term financial obligations in the amount of the net proceeds received and recognized interest on the tower obligations at a rate of approximately 8% for the 2012 Tower Transaction and 5% for the 2015 Tower Transaction using the effective interest method. The tower obligations are increased by interest expense and amortized through contractual leaseback payments made by us to CCI or PTI and through net cash flows generated and retained by CCI or PTI from operation of the tower sites. Our historical tower site asset costs continue to be reported in Property and equipment, net in our Condensed Consolidated Balance Sheets and are depreciated. Upon adoption of the new leasing standard we were required to reassess the previously failed sale-leasebacks and determine whether the transfer of the assets to the tower operator under the arrangement met the transfer of control criteria in the revenue standard and whether a sale should be recognized. We concluded that a sale has not occurred for the CCI Lease Sites and these sites continue to be accounted for as a failed sale-leaseback. We concluded that a sale had occurred for the CCI Sales Sites and the PTI Sales Sites and therefore we derecognized our existing long-term financial obligation and the tower-related property and equipment associated with these sites as part of the cumulative effect adjustment on January 1, 2019. The following table summarizes the balances of the failed sale-leasebacks in the Condensed Consolidated Balance Sheets : (in millions) June 30, December 31, Property and equipment, net $ 224 $ 329 Tower obligations 2,247 2,557 Future minimum payments related to the tower obligations are approximately $157 million for the year ending June 30, 2020 , $315 million in total for the years ending June 30, 2021 and 2022 , $315 million in total for years ending June 30, 2023 and 2024 , and $537 million in total for years thereafter. We are contingently liable for future ground lease payments through the remaining term of the CCI Lease Sites. These contingent obligations are not included in Operating lease liabilities as any amount due is contractually owed by CCI based on the subleasing arrangement. See Note 11 - Leases

Revenue from Contracts with Cus

Revenue from Contracts with Customers	6 Months Ended
	Jun. 30, 2019
Revenue from Contract with Customer [Abstract]
Revenue from Contracts with Customers	Note 9 – Revenue from Contracts with Customers Disaggregation of Revenue We provide wireless communication services to three primary categories of customers: • Branded postpaid customers generally include customers who are qualified to pay after receiving wireless communication services utilizing phones, DIGITS, or connected devices which includes tablets, wearables and SyncUP DRIVE™; • Branded prepaid customers generally include customers who pay for wireless communication services in advance. Our branded prepaid customers include customers of T-Mobile and Metro by T-Mobile; and • Wholesale customers include Machine-to-Machine (“M2M”) and Mobile Virtual Network Operator (“MVNO”) customers that operate on our network but are managed by wholesale partners. Branded postpaid service revenues, including branded postpaid phone revenues and branded postpaid other revenues, were as follows: Three Months Ended June 30, Six Months Ended June 30, (in millions) 2019 2018 2019 2018 Branded postpaid service revenues Branded postpaid phone revenues $ 5,287 $ 4,892 $ 10,470 $ 9,703 Branded postpaid other revenues 326 272 636 531 Total branded postpaid service revenues $ 5,613 $ 5,164 $ 11,106 $ 10,234 We operate as a single operating segment. The balances presented within each revenue line item in our Condensed Consolidated Statements of Comprehensive Income represent categories of revenue from contracts with customers disaggregated by type of product and service. Service revenues also include revenues earned for providing value added services to customers, such as handset insurance services. Revenue generated from the lease of mobile communication devices is included within Equipment revenues in our Condensed Consolidated Statements of Comprehensive Income . Equipment revenues from the lease of mobile communication devices were as follows: Three Months Ended June 30, Six Months Ended June 30, (in millions) 2019 2018 2019 2018 Equipment revenues from the lease of mobile communication devices $ 143 $ 177 $ 304 $ 348 Contract Balances The opening and closing balances of our contract asset and contract liability balances from contracts with customers as of December 31, 2018 and June 30, 2019 , were as follows: (in millions) Contract Assets Included in Other Current Assets Contract Liabilities Included in Deferred Revenue Balance as of December 31, 2018 $ 51 $ 645 Balance as of June 30, 2019 42 571 Change $ (9 ) $ (74 ) Contract assets primarily represent revenue recognized for equipment sales with promotional bill credits offered to customers that are paid over time and are contingent on the customer maintaining a service contract. The change in the contract asset balance includes customer activity related to new promotions, offset by billings on existing contracts and impairment which is recognized as bad debt expense. Contract liabilities are recorded when fees are collected, or we have an unconditional right to consideration (a receivable) in advance of delivery of goods or services. The change in contract liabilities is primarily related to customer activity associated with our prepaid plans including the receipt of cash payments and the satisfaction of our performance obligations. Revenues for the three and six months ended June 30, 2019 and 2018, include the following: Three Months Ended June 30, Six Months Ended June 30, (in millions) 2019 2018 2019 2018 Amounts included in the beginning of period contract liability balance $ 43 $ 31 $ 603 $ 559 Remaining Performance Obligations As of June 30, 2019 , the aggregate amount of transaction price allocated to remaining service performance obligations for branded postpaid contracts with promotional bill credits that result in an extended service contract is $234 million . We expect to recognize this revenue as service is provided over the extended contract term in the next 24 months . Certain of our wholesale, roaming and other service contracts include variable consideration based on usage. This variable consideration has been excluded from the disclosure of remaining performance obligations. As of June 30, 2019 , the aggregate amount of the contractual minimum consideration allocated to remaining service performance obligations for wholesale, roaming and other service contracts is $652 million , $1.1 billion and $1.6 billion for 2019 , 2020 and 2021 and beyond, respectively. These contracts have a remaining duration of less than one to eleven years . Information about remaining performance obligations that are part of a contract that has an original expected duration of one year or less have been excluded from the above, which primarily consists of monthly service contracts. The aggregate amount of the transaction price allocated to remaining service performance obligations includes the estimated amount to be invoiced to the customer. Contract Costs The total balance of deferred incremental costs to obtain contracts as of June 30, 2019 , was $765 million compared to $644 million as of December 31, 2018 . Deferred contract costs incurred to obtain postpaid service contracts are amortized over a period of 24 months . The amortization period is monitored to reflect any significant change in assumptions. Amortization of deferred contract costs was $137 million and $57 million for the three months ended June 30, 2019 and 2018 , respectively, and $253 million and $92 million for the six months ended June 30, 2019 and 2018 , respectively. The deferred contract cost asset is assessed for impairment on a periodic basis. There were no impairment losses recognized on deferred contract cost assets for the three and six months ended June 30, 2019 and 2018.

Earnings Per Share

Earnings Per Share	6 Months Ended
	Jun. 30, 2019
Earnings Per Share [Abstract]
Earnings Per Share	Note 10 – Earnings Per Share The computation of basic and diluted earnings per share was as follows: Three Months Ended June 30, Six Months Ended June 30, (in millions, except shares and per share amounts) 2019 2018 2019 2018 Net income $ 939 $ 782 $ 1,847 $ 1,453 Weighted average shares outstanding - basic 854,368,443 847,660,488 852,796,369 851,420,686 Effect of dilutive securities: Outstanding stock options and unvested stock awards 5,767,150 4,380,182 8,094,501 7,308,146 Weighted average shares outstanding - diluted 860,135,593 852,040,670 860,890,870 858,728,832 Earnings per share - basic $ 1.10 $ 0.92 $ 2.16 $ 1.71 Earnings per share - diluted $ 1.09 $ 0.92 $ 2.14 $ 1.69 Potentially dilutive securities: Outstanding stock options and unvested stock awards 67,856 797,948 39,342 487,133 As of June 30, 2019 , we had authorized 100 million shares of preferred stock, with a par value of $0.00001 per share. There was no preferred stock outstanding as of June 30, 2019 and 2018 . Potentially dilutive securities were not included in the computation of diluted earnings per share if to do so would have been anti-dilutive.

Leases

Leases	6 Months Ended
	Jun. 30, 2019
Leases [Abstract]
Leases	Note 11 - Leases Leases (Topic 842) Disclosures Lessee We are lessee for non-cancellable operating and finance leases for cell sites, switch sites, retail stores and office facilities with contractual terms through 2029 . The majority of cell site leases have an initial non-cancelable term of five to ten years with several renewal options that can extend the lease term from five to thirty-five years . In addition, we have finance leases for network equipment that generally have a non-cancelable lease term of two to five years ; the finance leases do not have renewal options and contain a bargain purchase option at the end of the lease. The components of lease expense were as follows: (in millions) Three Months Ended June 30, 2019 Six Months Ended June 30, 2019 Operating lease expense $ 634 $ 1,236 Financing lease expense: Amortization of right-of-use assets 117 230 Interest on lease liabilities 20 40 Total financing lease expense 137 270 Variable lease expense 58 123 Total lease expense $ 829 $ 1,629 Information relating to the lease term and discount rate is as follows: June 30, 2019 Weighted Average Remaining Lease Term (Years) Operating leases 6 Financing leases 3 Weighted Average Discount Rate Operating leases 5.2 % Financing leases 3.9 % Maturities of lease liabilities as of June 30, 2019, were as follows: (in millions) Operating Leases Finance Leases Twelve Months Ending June 30, 2020 $ 2,403 $ 1,021 2021 2,761 713 2022 2,503 430 2023 2,088 126 2024 1,449 58 Thereafter 3,543 91 Total lease payments 14,747 2,439 Less imputed interest 2,334 162 Total $ 12,413 $ 2,277 Interest payments for financing leases for the three and six months ended June 30, 2019, were $21 million and $41 million , respectively. As of June 30, 2019, we have additional operating leases for cell sites and commercial properties that have not yet commenced with lease payments of approximately $300 million . As of June 30, 2019, we were contingently liable for future ground lease payments related to the tower obligations. These contingent obligations are not included in the above table as the amounts owed are contractually owed by CCI based on the subleasing arrangement. See Note 8 - Tower Obligations for further information. Lessor JUMP! On Demand allows customers to lease a device (handset or tablet) over a period of up to 18 months and upgrade it for a new device up to one time per month. Upon device upgrade or at lease end, customers must return or purchase their device. The purchase price at the expiration of the lease is established at lease commencement and reflects the estimated residual value of the device, which reflects the estimated fair value of the underlying asset at the end of the lease term. The JUMP! On Demand leases do not contain any residual value guarantees or variable lease payments, and there are no restrictions or covenants imposed by these leases. Leased wireless devices are included in Property and equipment, net in our Condensed Consolidated Balance Sheets . The components of leased wireless devices under our JUMP! On Demand program were as follows: (in millions) June 30, December 31, Leased wireless devices, gross $ 988 $ 1,159 Accumulated depreciation (570 ) (622 ) Leased wireless devices, net $ 418 $ 537 For equipment revenues from the lease of mobile communication devices, see Note 9 - Revenue from Contracts with Customers . Future minimum payments expected to be received over the lease term related to the leased wireless devices, which exclude optional residual buy-out amounts at the end of the lease term, are summarized below: (in millions) Total Twelve Months Ending June 30, 2020 $ 318 2021 47 Total $ 365 Leases (Topic 840) Disclosures On January 1, 2019, we adopted the new lease standard using a modified-retrospective approach by recognizing and measuring leases at the adoption date with a cumulative effect of initially applying the guidance recognized at the date of initial application and did not restate the prior periods presented in our Consolidated Financial Statements. As such, prior periods presented in our Consolidated Financial Statements continue to be in accordance with the former lease standard, Topic 840 Leases. See Note 1 - Summary of Significant Accounting Policies for further information. Operating Leases Under the previous lease standard, we had non-cancellable operating leases for cell sites, switch sites, retail stores and office facilities. As of December 31, 2018, these leases had contractual terms expiring through 2028 , with the majority of cell site leases having an initial non-cancelable term of five to ten years with several renewal options. In addition, we had operating leases for dedicated transportation lines with varying expiration terms through 2027 . Our commitments under leases existing as of December 31, 2018 were approximately $2.7 billion for the year ending December 31, 2019, $4.7 billion in total for the years ending December 31, 2020 and 2021, $3.3 billion in total for the years ending December 31, 2022 and 2023 and $3.8 billion in total for years thereafter. Total rent expense under operating leases, including dedicated transportation lines, was $765 million and $1.5 billion for the three and six months ended June 30, 2018, and was classified as Cost of services and Selling, general and administrative expense in our Condensed Consolidated Statements of Comprehensive Income. Lessor As of December 31, 2018, the future minimum payments expected to be received over the lease term related to the leased wireless devices, which exclude optional residual buy-out amounts at the end of the lease term, are summarized below: (in millions) Total Year Ended December 31, 2019 $ 419 2020 59 Total $ 478 Capital Leases Within property and equipment, wireless communication systems include capital lease agreements for network equipment with varying expiration terms through 2033 . Capital lease assets and accumulated amortization were $3.1 billion and $867 million as of December 31, 2018. As of December 31, 2018, the future minimum payments required under capital leases, including interest and maintenance, over their remaining terms are summarized below: (in millions) Future Minimum Payments Year Ended December 31, 2019 $ 909 2020 631 2021 389 2022 102 2023 66 Thereafter 106 Total $ 2,203 Included in Total Interest $ 143 Maintenance 45
Leases	Note 11 - Leases Leases (Topic 842) Disclosures Lessee We are lessee for non-cancellable operating and finance leases for cell sites, switch sites, retail stores and office facilities with contractual terms through 2029 . The majority of cell site leases have an initial non-cancelable term of five to ten years with several renewal options that can extend the lease term from five to thirty-five years . In addition, we have finance leases for network equipment that generally have a non-cancelable lease term of two to five years ; the finance leases do not have renewal options and contain a bargain purchase option at the end of the lease. The components of lease expense were as follows: (in millions) Three Months Ended June 30, 2019 Six Months Ended June 30, 2019 Operating lease expense $ 634 $ 1,236 Financing lease expense: Amortization of right-of-use assets 117 230 Interest on lease liabilities 20 40 Total financing lease expense 137 270 Variable lease expense 58 123 Total lease expense $ 829 $ 1,629 Information relating to the lease term and discount rate is as follows: June 30, 2019 Weighted Average Remaining Lease Term (Years) Operating leases 6 Financing leases 3 Weighted Average Discount Rate Operating leases 5.2 % Financing leases 3.9 % Maturities of lease liabilities as of June 30, 2019, were as follows: (in millions) Operating Leases Finance Leases Twelve Months Ending June 30, 2020 $ 2,403 $ 1,021 2021 2,761 713 2022 2,503 430 2023 2,088 126 2024 1,449 58 Thereafter 3,543 91 Total lease payments 14,747 2,439 Less imputed interest 2,334 162 Total $ 12,413 $ 2,277 Interest payments for financing leases for the three and six months ended June 30, 2019, were $21 million and $41 million , respectively. As of June 30, 2019, we have additional operating leases for cell sites and commercial properties that have not yet commenced with lease payments of approximately $300 million . As of June 30, 2019, we were contingently liable for future ground lease payments related to the tower obligations. These contingent obligations are not included in the above table as the amounts owed are contractually owed by CCI based on the subleasing arrangement. See Note 8 - Tower Obligations for further information. Lessor JUMP! On Demand allows customers to lease a device (handset or tablet) over a period of up to 18 months and upgrade it for a new device up to one time per month. Upon device upgrade or at lease end, customers must return or purchase their device. The purchase price at the expiration of the lease is established at lease commencement and reflects the estimated residual value of the device, which reflects the estimated fair value of the underlying asset at the end of the lease term. The JUMP! On Demand leases do not contain any residual value guarantees or variable lease payments, and there are no restrictions or covenants imposed by these leases. Leased wireless devices are included in Property and equipment, net in our Condensed Consolidated Balance Sheets . The components of leased wireless devices under our JUMP! On Demand program were as follows: (in millions) June 30, December 31, Leased wireless devices, gross $ 988 $ 1,159 Accumulated depreciation (570 ) (622 ) Leased wireless devices, net $ 418 $ 537 For equipment revenues from the lease of mobile communication devices, see Note 9 - Revenue from Contracts with Customers . Future minimum payments expected to be received over the lease term related to the leased wireless devices, which exclude optional residual buy-out amounts at the end of the lease term, are summarized below: (in millions) Total Twelve Months Ending June 30, 2020 $ 318 2021 47 Total $ 365 Leases (Topic 840) Disclosures On January 1, 2019, we adopted the new lease standard using a modified-retrospective approach by recognizing and measuring leases at the adoption date with a cumulative effect of initially applying the guidance recognized at the date of initial application and did not restate the prior periods presented in our Consolidated Financial Statements. As such, prior periods presented in our Consolidated Financial Statements continue to be in accordance with the former lease standard, Topic 840 Leases. See Note 1 - Summary of Significant Accounting Policies for further information. Operating Leases Under the previous lease standard, we had non-cancellable operating leases for cell sites, switch sites, retail stores and office facilities. As of December 31, 2018, these leases had contractual terms expiring through 2028 , with the majority of cell site leases having an initial non-cancelable term of five to ten years with several renewal options. In addition, we had operating leases for dedicated transportation lines with varying expiration terms through 2027 . Our commitments under leases existing as of December 31, 2018 were approximately $2.7 billion for the year ending December 31, 2019, $4.7 billion in total for the years ending December 31, 2020 and 2021, $3.3 billion in total for the years ending December 31, 2022 and 2023 and $3.8 billion in total for years thereafter. Total rent expense under operating leases, including dedicated transportation lines, was $765 million and $1.5 billion for the three and six months ended June 30, 2018, and was classified as Cost of services and Selling, general and administrative expense in our Condensed Consolidated Statements of Comprehensive Income. Lessor As of December 31, 2018, the future minimum payments expected to be received over the lease term related to the leased wireless devices, which exclude optional residual buy-out amounts at the end of the lease term, are summarized below: (in millions) Total Year Ended December 31, 2019 $ 419 2020 59 Total $ 478 Capital Leases Within property and equipment, wireless communication systems include capital lease agreements for network equipment with varying expiration terms through 2033 . Capital lease assets and accumulated amortization were $3.1 billion and $867 million as of December 31, 2018. As of December 31, 2018, the future minimum payments required under capital leases, including interest and maintenance, over their remaining terms are summarized below: (in millions) Future Minimum Payments Year Ended December 31, 2019 $ 909 2020 631 2021 389 2022 102 2023 66 Thereafter 106 Total $ 2,203 Included in Total Interest $ 143 Maintenance 45

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Note 12 – Commitments and Contingencies Purchase Commitments In September 2018, we signed a reciprocal long-term spectrum lease with Sprint. The lease includes an offsetting amount to be received from Sprint for the lease of our spectrum. Lease payments began in the fourth quarter of 2018. The minimum commitment under this lease as of June 30, 2019 , is $509 million . The reciprocal long-term lease is a distinct transaction from the Merger. Under the previous lease standard certain of our network backhaul arrangements were accounted for as operating leases. Obligations under these agreements were included within our operating lease commitments as of December 31, 2018. These agreements no longer qualify as leases under the new lease standard. Our commitments under these agreements as of June 30, 2019 , were approximately $147 million for the year ending June 30, 2020, $242 million in total for the years ended June 30, 2021 and 2022, $160 million in total for the years ended June 30, 2023 and 2024, and $188 million in total for years thereafter. Interest rate lock derivatives In October 2018, we entered into interest rate lock derivatives with notional amounts of $9.6 billion . These interest rate lock derivatives were designated as cash flow hedges to reduce variability in cash flows due to changes in interest payments attributable to increases or decreases in the benchmark interest rate during the period leading up to the probable issuance of fixed-rate debt. The fair value of interest rate lock derivatives as of June 30, 2019 , was a liability of $1.1 billion and is included in Other current liabilities in our Condensed Consolidated Balance Sheets . See Note 7 – Fair Value Measurements for further information. Renewable Energy Purchase Agreements In April 2019, T-Mobile USA entered into a Renewable Energy Purchase Agreement (“REPA”) with a third party that is based on the expected operation of a solar photovoltaic electrical generation facility located in Texas and will remain in effect until the fifteenth anniversary of the facility’s entry into commercial operation. Commercial operation of the facility is expected to occur in July 2021. The REPA consists of an energy forward agreement that is net settled based on energy prices and the energy output generated by the facility. We have determined that the REPA does not meet the definition of a derivative because the expected energy output of the facility may not be reliably estimated (the arrangement lacks a notional amount). The REPA does not contain any unconditional purchase obligations because amounts under the agreement are not fixed and determinable. Our participation in the REPA did not require an upfront investment or capital commitment. We do not control the activities that most significantly impact the energy-generating facility, nor do we direct the use of, or receive specific energy output from, the facility. Contingencies and Litigation Litigation Matters We are involved in various lawsuits and disputes, claims, government agency investigations and enforcement actions, and other proceedings (“Litigation Matters”) that arise in the ordinary course of business, which include claims of patent infringement (most of which are asserted by non-practicing entities primarily seeking monetary damages), class actions, and proceedings to enforce FCC rules and regulations. The Litigation Matters described above have progressed to various stages and some of them may proceed to trial, arbitration, hearing or other adjudication that could result in fines, penalties, or awards of monetary or injunctive relief in the coming 12 months if they are not otherwise resolved. We have established an accrual with respect to certain of these matters, where appropriate, which is reflected in the Consolidated Financial Statements but that is not considered to be, individually or in the aggregate, material. An accrual is established when we believe it is both probable that a loss has been incurred and an amount can be reasonably estimated. For other matters, where we have not determined that a loss is probable or because the amount of loss cannot be reasonably estimated, we have not recorded an accrual due to various factors typical in contested proceedings, including but not limited to uncertainty concerning legal theories and their resolution by courts or regulators, uncertain damage theories and demands, and a less than fully developed factual record. While we do not expect that the ultimate resolution of these proceedings, individually or in the aggregate, will have a material adverse effect on our financial position, an unfavorable outcome of some or all of these proceedings could have a material adverse impact on results of operations or cash flows for a particular period. This assessment is based on our current understanding of relevant facts and circumstances. As such, our view of these matters is subject to inherent uncertainties and may change in the future.

Subsequent Event

Subsequent Event	6 Months Ended
	Jun. 30, 2019
Subsequent Events [Abstract]
Subsequent Event	Note 13 – Subsequent Event In July 2019, we entered into various agreements, including an amendment to the Business Combination Agreement, in connection with the Merger. See Note 3 – Business Combinations for further information.

Guarantor Financial Information

Guarantor Financial Information	6 Months Ended
	Jun. 30, 2019
Condensed Financial Information Disclosure [Abstract]
Guarantor Financial Information	Note 14 – Guarantor Financial Information Pursuant to the applicable indentures and supplemental indentures, the long-term debt to affiliates and third parties issued by T-Mobile USA (“Issuer”) is fully and unconditionally guaranteed, jointly and severally, on a senior unsecured basis by T-Mobile (“Parent”) and certain of the Issuer’s 100% owned subsidiaries (“Guarantor Subsidiaries”). The guarantees of the Guarantor Subsidiaries are subject to release in limited circumstances only upon the occurrence of certain customary conditions. The indentures and credit facilities governing the long-term debt contain covenants that, among other things, limit the ability of the Issuer and the Guarantor Subsidiaries to incur more debt, pay dividends and make distributions, make certain investments, repurchase stock, create liens or other encumbrances, enter into transactions with affiliates, enter into transactions that restrict dividends or distributions from subsidiaries, and merge, consolidate or sell, or otherwise dispose of, substantially all of their assets. Certain provisions of each of the credit facilities, indentures and supplemental indentures relating to the long-term debt restrict the ability of the Issuer to loan funds or make payments to Parent. However, the Issuer and Guarantor Subsidiaries are allowed to make certain permitted payments to the Parent under the terms of the indentures and the supplemental indentures. On October 23, 2018, SLMA LLC was formed as a limited liability company in Delaware to serve as an escrow subsidiary to facilitate the contemplated issuance of notes by Parent in connection with the Transactions. SLMA LLC is an indirect, 100% owned finance subsidiary of Parent, as such term is used in Rule 3-10(b) of Regulation S-X, and has been designated as an unrestricted subsidiary under the Issuer’s existing debt securities. Any debt securities that may be issued from time to time by SLMA LLC will be fully and unconditionally guaranteed by Parent. Presented below is the condensed consolidating financial information as of June 30, 2019 and December 31, 2018 , and for the three and six months ended June 30, 2019 and 2018 . Condensed Consolidating Balance Sheet Information June 30, 2019 (in millions) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Consolidating and Eliminating Adjustments Consolidated Assets Current assets Cash and cash equivalents $ 4 $ 2 $ 970 $ 129 $ — $ 1,105 Accounts receivable, net — — 1,526 291 — 1,817 Equipment installment plan receivables, net — — 2,446 — — 2,446 Accounts receivable from affiliates — — 18 — — 18 Inventory — — 998 — — 998 Other current assets — — 1,052 678 — 1,730 Total current assets 4 2 7,010 1,098 — 8,114 Property and equipment, net (1) — — 21,535 312 — 21,847 Operating lease right-of-use assets — — 10,436 3 — 10,439 Financing lease right-of-use assets — — 2,589 — — 2,589 Goodwill — — 1,683 218 — 1,901 Spectrum licenses — — 36,430 — — 36,430 Other intangible assets, net — — 85 72 — 157 Investments in subsidiaries, net 27,332 49,416 — — (76,748 ) — Intercompany receivables and note receivables — 4,618 — — (4,618 ) — Equipment installment plan receivables due after one year, net — — 1,604 — — 1,604 Other assets — 8 1,637 226 (164 ) 1,707 Total assets $ 27,336 $ 54,044 $ 83,009 $ 1,929 $ (81,530 ) $ 84,788 Liabilities and Stockholders' Equity Current liabilities Accounts payable and accrued liabilities $ — $ 229 $ 6,736 $ 295 $ — $ 7,260 Payables to affiliates — 147 51 — — 198 Short-term debt — 300 — — — 300 Deferred revenue — — 619 1 — 620 Short-term operating lease liabilities — — 2,265 3 — 2,268 Short-term financing lease liabilities — — 963 — — 963 Other current liabilities — 1,097 154 313 — 1,564 Total current liabilities — 1,773 10,788 612 — 13,173 Long-term debt — 10,954 — — — 10,954 Long-term debt to affiliates — 13,985 — — — 13,985 Tower obligations (1) — — 76 2,171 — 2,247 Deferred tax liabilities — — 5,254 — (164 ) 5,090 Operating lease liabilities — — 10,145 — — 10,145 Financing lease liabilities — — 1,314 — — 1,314 Negative carrying value of subsidiaries, net — — 815 — (815 ) — Intercompany payables and debt 369 — 3,872 377 (4,618 ) — Other long-term liabilities — — 890 23 — 913 Total long-term liabilities 369 24,939 22,366 2,571 (5,597 ) 44,648 Total stockholders' equity (deficit) 26,967 27,332 49,855 (1,254 ) (75,933 ) 26,967 Total liabilities and stockholders' equity $ 27,336 $ 54,044 $ 83,009 $ 1,929 $ (81,530 ) $ 84,788 (1) Assets and liabilities for Non-Guarantor Subsidiaries are primarily included in VIEs related to the 2012 Tower Transaction. See Note 8 – Tower Obligations for further information. Condensed Consolidating Balance Sheet Information December 31, 2018 (in millions) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Consolidating and Eliminating Adjustments Consolidated Assets Current assets Cash and cash equivalents $ 2 $ 1 $ 1,079 $ 121 $ — $ 1,203 Accounts receivable, net — — 1,510 259 — 1,769 Equipment installment plan receivables, net — — 2,538 — — 2,538 Accounts receivable from affiliates — — 11 — — 11 Inventory — — 1,084 — — 1,084 Other current assets — — 1,031 645 — 1,676 Total current assets 2 1 7,253 1,025 — 8,281 Property and equipment, net (1) — — 23,062 297 — 23,359 Goodwill — — 1,683 218 — 1,901 Spectrum licenses — — 35,559 — — 35,559 Other intangible assets, net — — 116 82 — 198 Investments in subsidiaries, net 25,314 46,516 — — (71,830 ) — Intercompany receivables and note receivables — 5,174 — — (5,174 ) — Equipment installment plan receivables due after one year, net — — 1,547 — — 1,547 Other assets — 7 1,540 221 (145 ) 1,623 Total assets $ 25,316 $ 51,698 $ 70,760 $ 1,843 $ (77,149 ) $ 72,468 Liabilities and Stockholders' Equity Current liabilities Accounts payable and accrued liabilities $ — $ 228 $ 7,240 $ 273 $ — $ 7,741 Payables to affiliates — 157 43 — — 200 Short-term debt — — 841 — — 841 Deferred revenue — — 698 — — 698 Other current liabilities — 447 164 176 — 787 Total current liabilities — 832 8,986 449 — 10,267 Long-term debt — 10,950 1,174 — — 12,124 Long-term debt to affiliates — 14,582 — — — 14,582 Tower obligations (1) — — 384 2,173 — 2,557 Deferred tax liabilities — — 4,617 — (145 ) 4,472 Deferred rent expense — — 2,781 — — 2,781 Negative carrying value of subsidiaries, net — — 676 — (676 ) — Intercompany payables and debt 598 — 4,234 342 (5,174 ) — Other long-term liabilities — 20 926 21 — 967 Total long-term liabilities 598 25,552 14,792 2,536 (5,995 ) 37,483 Total stockholders' equity (deficit) 24,718 25,314 46,982 (1,142 ) (71,154 ) 24,718 Total liabilities and stockholders' equity $ 25,316 $ 51,698 $ 70,760 $ 1,843 $ (77,149 ) $ 72,468 (1) Assets and liabilities for Non-Guarantor Subsidiaries are primarily included in VIEs related to the 2012 Tower Transaction. See Note 8 – Tower Obligations for further information. Condensed Consolidating Statement of Comprehensive Income Information Three Months Ended June 30, 2019 (in millions) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Consolidating and Eliminating Adjustments Consolidated Revenues Service revenues $ — $ — $ 7,992 $ 767 $ (333 ) $ 8,426 Equipment revenues — — 2,320 2 (59 ) 2,263 Other revenues — 3 276 51 (40 ) 290 Total revenues — 3 10,588 820 (432 ) 10,979 Operating expenses Cost of services, exclusive of depreciation and amortization shown separately below — — 1,668 9 (28 ) 1,649 Cost of equipment sales, exclusive of depreciation and amortization shown separately below — — 2,418 302 (59 ) 2,661 Selling, general and administrative — — 3,595 293 (345 ) 3,543 Depreciation and amortization — — 1,564 21 — 1,585 Total operating expense — — 9,245 625 (432 ) 9,438 Operating income — 3 1,343 195 — 1,541 Other income (expense) Interest expense — (114 ) (21 ) (47 ) — (182 ) Interest expense to affiliates — (102 ) (4 ) — 5 (101 ) Interest income — 5 3 1 (5 ) 4 Other expense, net — (19 ) (3 ) — — (22 ) Total other expense, net — (230 ) (25 ) (46 ) — (301 ) Income (loss) before income taxes — (227 ) 1,318 149 — 1,240 Income tax expense — — (270 ) (31 ) — (301 ) Earnings of subsidiaries 939 1,166 10 — (2,115 ) — Net income $ 939 $ 939 $ 1,058 $ 118 $ (2,115 ) $ 939 Net income $ 939 $ 939 $ 1,058 $ 118 $ (2,115 ) $ 939 Other comprehensive (loss) income, net of tax Other comprehensive (loss) income, net of tax (292 ) (292 ) 103 — 189 (292 ) Total comprehensive income $ 647 $ 647 $ 1,161 $ 118 $ (1,926 ) $ 647 Condensed Consolidating Statement of Comprehensive Income Information Three Months Ended June 30, 2018 (in millions) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Consolidating and Eliminating Adjustments Consolidated Revenues Service revenues $ — $ — $ 7,609 $ 551 $ (229 ) $ 7,931 Equipment revenues — — 2,370 1 (46 ) 2,325 Other revenues — 2 267 55 (9 ) 315 Total revenues — 2 10,246 607 (284 ) 10,571 Operating expenses Cost of services, exclusive of depreciation and amortization shown separately below — — 1,522 8 — 1,530 Cost of equipment sales, exclusive of depreciation and amortization shown separately below — — 2,556 262 (46 ) 2,772 Selling, general and administrative — 6 3,201 216 (238 ) 3,185 Depreciation and amortization — — 1,611 23 — 1,634 Total operating expenses — 6 8,890 509 (284 ) 9,121 Operating income (loss) — (4 ) 1,356 98 — 1,450 Other income (expense) Interest expense — (120 ) (28 ) (48 ) — (196 ) Interest expense to affiliates — (129 ) (4 ) — 5 (128 ) Interest income — 6 4 1 (5 ) 6 Other expense, net — (59 ) (5 ) — — (64 ) Total other expense, net — (302 ) (33 ) (47 ) — (382 ) Income (loss) before income taxes — (306 ) 1,323 51 — 1,068 Income tax expense — — (277 ) (9 ) — (286 ) Earnings of subsidiaries 782 1,088 23 — (1,893 ) — Net income $ 782 $ 782 $ 1,069 $ 42 $ (1,893 ) $ 782 Other comprehensive income (loss), net of tax Other comprehensive income, net of tax 3 3 3 — (6 ) 3 Total comprehensive income $ 785 $ 785 $ 1,072 $ 42 $ (1,899 ) $ 785 Condensed Consolidating Statement of Comprehensive Income Information Six Months Ended June 30, 2019 (in millions) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Consolidating and Eliminating Adjustments Consolidated Revenues Service revenues $ — $ — $ 15,851 $ 1,499 $ (647 ) $ 16,703 Equipment revenues — — 4,890 2 (113 ) 4,779 Other revenues — 9 549 101 (82 ) 577 Total revenues — 9 21,290 1,602 (842 ) 22,059 Operating expenses Cost of services, exclusive of depreciation and amortization shown separately below — — 3,236 15 (56 ) 3,195 Cost of equipment sales, exclusive of depreciation and amortization shown separately below — — 5,216 574 (113 ) 5,677 Selling, general and administrative — 1 7,089 568 (673 ) 6,985 Depreciation and amortization — — 3,142 43 — 3,185 Total operating expense — 1 18,683 1,200 (842 ) 19,042 Operating income — 8 2,607 402 — 3,017 Other income (expense) Interest expense — (226 ) (41 ) (94 ) — (361 ) Interest expense to affiliates — (211 ) (9 ) — 10 (210 ) Interest income — 10 10 2 (10 ) 12 Other expense, net — (11 ) (4 ) — — (15 ) Total other expense, net — (438 ) (44 ) (92 ) — (574 ) Income (loss) before income taxes — (430 ) 2,563 310 — 2,443 Income tax expense — — (531 ) (65 ) — (596 ) Earnings of subsidiaries 1,847 2,277 17 — (4,141 ) — Net income $ 1,847 $ 1,847 $ 2,049 $ 245 $ (4,141 ) $ 1,847 Net income $ 1,847 $ 1,847 $ 2,049 $ 245 $ (4,141 ) $ 1,847 Other comprehensive (loss) income, net of tax Other comprehensive (loss) income, net of tax (481 ) (481 ) 168 — 313 (481 ) Total comprehensive income $ 1,366 $ 1,366 $ 2,217 $ 245 $ (3,828 ) $ 1,366 Condensed Consolidating Statement of Comprehensive Income Information Six Months Ended June 30, 2018 (in millions) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Consolidating and Eliminating Adjustments Consolidated Revenues Service revenues $ — $ — $ 15,096 $ 1,091 $ (450 ) $ 15,737 Equipment revenues — — 4,777 1 (100 ) 4,678 Other revenues — 3 516 110 (18 ) 611 Total revenues — 3 20,389 1,202 (568 ) 21,026 Operating expenses Cost of services, exclusive of depreciation and amortization shown separately below — — 3,102 17 — 3,119 Cost of equipment sales, exclusive of depreciation and amortization shown separately below — — 5,220 498 (101 ) 5,617 Selling, general and administrative — 6 6,358 452 (467 ) 6,349 Depreciation and amortization — — 3,165 44 — 3,209 Total operating expenses — 6 17,845 1,011 (568 ) 18,294 Operating income (loss) — (3 ) 2,544 191 — 2,732 Other income (expense) Interest expense — (294 ) (57 ) (96 ) — (447 ) Interest expense to affiliates — (295 ) (9 ) — 10 (294 ) Interest income — 12 9 1 (10 ) 12 Other (expense) income, net — (91 ) 37 — — (54 ) Total other expense, net — (668 ) (20 ) (95 ) — (783 ) Income (loss) before income taxes — (671 ) 2,524 96 — 1,949 Income tax expense — — (476 ) (20 ) — (496 ) Earnings of subsidiaries 1,453 2,124 17 — (3,594 ) — Net income $ 1,453 $ 1,453 $ 2,065 $ 76 $ (3,594 ) $ 1,453 Net income $ 1,453 $ 1,453 $ 2,065 $ 76 $ (3,594 ) $ 1,453 Other comprehensive loss, net of tax Other comprehensive loss, net of tax — — — — — — Total comprehensive income $ 1,453 $ 1,453 $ 2,065 $ 76 $ (3,594 ) $ 1,453 Condensed Consolidating Statement of Cash Flows Information Three Months Ended June 30, 2019 (in millions) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Consolidating and Eliminating Adjustments Consolidated Operating activities Net cash (used in) provided by operating activities $ — $ (124 ) $ 3,112 $ (686 ) $ (155 ) $ 2,147 Investing activities Purchases of property and equipment — — (1,740 ) (49 ) — (1,789 ) Purchases of spectrum licenses and other intangible assets, including deposits — — (665 ) — — (665 ) Proceeds related to beneficial interests in securitization transactions — — 8 831 — 839 Net cash (used in) provided by investing activities — — (2,397 ) 782 — (1,615 ) Financing activities Proceeds from borrowing on revolving credit facility, net — 880 — — — 880 Repayments of revolving credit facility — — (880 ) — — (880 ) Repayments of financing lease obligations — — (229 ) — — (229 ) Repayments of long-term debt — — (600 ) — — (600 ) Intercompany advances, net — (756 ) 688 68 — — Tax withholdings on share-based awards — — (4 ) — — (4 ) Cash payments for debt prepayment or debt extinguishment costs — — (28 ) — — (28 ) Intercompany dividend paid — — — (155 ) 155 — Other, net 1 — (6 ) — — (5 ) Net cash provided (used in) by financing activities 1 124 (1,059 ) (87 ) 155 (866 ) Change in cash and cash equivalents 1 — (344 ) 9 — (334 ) Cash and cash equivalents Beginning of period 3 2 1,314 120 — 1,439 End of period $ 4 $ 2 $ 970 $ 129 $ — $ 1,105 Condensed Consolidating Statement of Cash Flows Information Three Months Ended June 30, 2018 (in millions) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Consolidating and Eliminating Adjustments Consolidated Operating activities Net cash (used in) provided by operating activities $ (1 ) $ (258 ) $ 2,932 $ (1,282 ) $ (130 ) $ 1,261 Investing activities Purchases of property and equipment — — (1,624 ) (5 ) — (1,629 ) Purchases of spectrum licenses and other intangible assets, including deposits — — (28 ) — — (28 ) Proceeds related to beneficial interests in securitization transactions — — 12 1,311 — 1,323 Acquisition of companies, net of cash acquired — — (5 ) — — (5 ) Equity investment in subsidiary — — (26 ) — 26 — Other, net — — 33 — — 33 Net cash (used in) provided by investing activities — — (1,638 ) 1,306 26 (306 ) Financing activities Payments of consent fees related to long-term debt — — (38 ) — — (38 ) Proceeds from borrowing on revolving credit facility, net — 2,070 — — — 2,070 Repayments of revolving credit facility — — (2,195 ) — — (2,195 ) Repayments of financing lease obligations — — (154 ) (1 ) — (155 ) Repayments of long-term debt — — (2,350 ) — — (2,350 ) Repurchases of common stock (405 ) — — — — (405 ) Intercompany advances, net 405 (1,810 ) 1,406 (1 ) — — Equity investment from parent — — — 26 (26 ) — Tax withholdings on share-based awards — — (10 ) — — (10 ) Cash payments for debt prepayment or debt extinguishment costs — — (181 ) — — (181 ) Intercompany dividend paid — — — (130 ) 130 — Other, net 1 — (4 ) — — (3 ) Net cash provided (used in) by financing activities 1 260 (3,526 ) (106 ) 104 (3,267 ) Change in cash and cash equivalents — 2 (2,232 ) (82 ) — (2,312 ) Cash and cash equivalents Beginning of period 1 1 2,395 130 — 2,527 End of period $ 1 $ 3 $ 163 $ 48 $ — $ 215 Condensed Consolidating Statement of Cash Flows Information Six Months Ended June 30, 2019 (in millions) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Consolidating and Eliminating Adjustments Consolidated Operating activities Net cash (used in) provided by operating activities $ — $ (372 ) $ 5,909 $ (1,703 ) $ (295 ) $ 3,539 Investing activities Purchases of property and equipment — — (3,666 ) (54 ) — (3,720 ) Purchases of spectrum licenses and other intangible assets, including deposits — — (850 ) — — (850 ) Proceeds related to beneficial interests in securitization transactions — — 17 1,979 — 1,996 Other, net — — (7 ) — — (7 ) Net cash (used in) provided by investing activities — — (4,506 ) 1,925 — (2,581 ) Financing activities Proceeds from borrowing on revolving credit facility, net — 1,765 — — — 1,765 Repayments of revolving credit facility — — (1,765 ) — — (1,765 ) Repayments of financing lease obligations — — (314 ) (1 ) — (315 ) Repayments of long-term debt — — (600 ) — — (600 ) Intercompany advances, net — (1,392 ) 1,310 82 — — Tax withholdings on share-based awards — — (104 ) — — (104 ) Cash payments for debt prepayment or debt extinguishment costs — — (28 ) — — (28 ) Intercompany dividend paid — — — (295 ) 295 — Other, net 2 — (11 ) — — (9 ) Net cash provided (used in) by financing activities 2 373 (1,512 ) (214 ) 295 (1,056 ) Change in cash and cash equivalents 2 1 (109 ) 8 — (98 ) Cash and cash equivalents Beginning of period 2 1 1,079 121 — 1,203 End of period $ 4 $ 2 $ 970 $ 129 $ — $ 1,105 Condensed Consolidating Statement of Cash Flows Information Six Months Ended June 30, 2018 (in millions) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Consolidating and Eliminating Adjustments Consolidated Operating activities Net cash (used in) provided by operating activities $ — $ (662 ) $ 5,306 $ (2,483 ) $ (130 ) $ 2,031 Investing activities Purchases of property and equipment — — (2,990 ) (5 ) — (2,995 ) Purchases of spectrum licenses and other intangible assets, including deposits — — (79 ) — — (79 ) Proceeds related to beneficial interests in securitization transactions — — 25 2,593 — 2,618 Acquisition of companies, net of cash — — (338 ) — — (338 ) Equity investment in subsidiary — — (26 ) — 26 — Other, net — — 26 — — 26 Net cash (used in) provided by investing activities — — (3,382 ) 2,588 26 (768 ) Financing activities Proceeds from issuance of long-term debt — 2,494 — — — 2,494 Payments of consent fees related to long-term debt — — (38 ) — — (38 ) Proceeds from borrowing on revolving credit facility, net — 4,240 — — — 4,240 Repayments of revolving credit facility — — (3,920 ) — — (3,920 ) Repayments of financing lease obligations — — (326 ) (1 ) — (327 ) Repayments of long-term debt — — (3,349 ) — — (3,349 ) Repurchases of common stock (1,071 ) — — — — (1,071 ) Intercompany advances, net 995 (6,070 ) 5,085 (10 ) — — Equity investment from parent — — — 26 (26 ) — Tax withholdings on share-based awards — — (84 ) — — (84 ) Cash payments for debt prepayment or debt extinguishment costs — — (212 ) — — (212 ) Intercompany dividend paid — — — (130 ) 130 — Other, net 3 — (3 ) — — — Net cash (used in) provided by financing activities (73 ) 664 (2,847 ) (115 ) 104 (2,267 ) Change in cash and cash equivalents (73 ) 2 (923 ) (10 ) — (1,004 ) Cash and cash equivalents Beginning of period 74 1 1,086 58 — 1,219 End of period $ 1 $ 3 $ 163 $ 48 $ — $ 215

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	The unaudited condensed consolidated financial statements of T-Mobile US, Inc. (“T-Mobile,” “we,” “our,” “us” or “the Company”) include all adjustments of a normal recurring nature necessary for the fair presentation of the results for the interim periods presented. The results for the interim periods are not necessarily indicative of those for the full year. The condensed consolidated financial statements should be read in conjunction with our consolidated financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2018. The condensed consolidated financial statements include the balances and results of operations of T-Mobile and our consolidated subsidiaries. We consolidate majority-owned subsidiaries over which we exercise control, as well as variable interest entities (“VIE”) where we are deemed to be the primary beneficiary and VIEs which cannot be deconsolidated, such as those related to Tower obligations (Tower obligations are included in VIEs related to the 2012 Tower Transaction. See Note 8 - Tower Obligations for further information). Intercompany transactions and balances have been eliminated in consolidation.
Basis of Accounting	The preparation of financial statements in conformity with United States (“U.S.”) generally accepted accounting principles (“GAAP”) requires our management to make estimates and assumptions which affect the financial statements and accompanying notes.
Use of Estimates	Estimates are based on historical experience, where applicable, and other assumptions which our management believes are reasonable under the circumstances. These estimates are inherently subject to judgment and actual results could differ from those estimates.
Accounting Pronouncements Adopted During the Current Year/Accounting Pronouncements Not Yet Adopted	Accounting Pronouncements Adopted During the Current Year Leases In February 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2016-02, “Leases (Topic 842),” and has since modified the standard with several ASUs (collectively, the “new lease standard”). The new lease standard is effective for us, and we adopted the standard, on January 1, 2019. We adopted the standard by recognizing and measuring leases at the adoption date with a cumulative effect of initially applying the guidance recognized at the date of initial application and as a result did not restate the prior periods presented in the Condensed Consolidated Financial Statements. The new lease standard provides for a number of optional practical expedients in transition. We did not elect the “package of practical expedients” and as a result reassessed under the new lease standard our prior accounting conclusions about lease identification, lease classification and initial direct costs. We elected to use hindsight for determining the reasonably certain lease term. We did not elect the practical expedient pertaining to land easements as it is not applicable to us. The new lease standard provides practical expedients and policy elections for an entity’s ongoing accounting. Generally, we elected the practical expedient to not separate lease and non-lease components in arrangements whereby we are the lessee. For arrangements in which we are lessor we did not elect this practical expedient. We did not elect the short-term lease recognition exemption, which includes the recognition of right-of-use assets and lease liabilities for existing short-term leases at transition. We have also applied this election to all active leases at transition. The most significant judgments and impacts upon adoption of the standard include the following: • In evaluating contracts to determine if they qualify as a lease, we consider factors such as if we have obtained or transferred substantially all of the rights to the underlying asset through exclusivity, if we can or if we have transferred the ability to direct the use of the asset by making decisions about how and for what purpose the asset will be used and if the lessor has substantive substitution rights. • We recognized right-of-use assets and operating lease liabilities for operating leases that have not previously been recorded. The lease liability for operating leases is based on the net present value of future minimum lease payments. The right-of-use asset for operating leases is based on the lease liability adjusted for the reclassification of certain balance sheet amounts such as prepaid rent and deferred rent, which we remeasured at adoption due to the application of hindsight to our lease term estimates. Deferred and prepaid rent will no longer be presented separately. • Capital lease assets previously included within Property and equipment, net were reclassified to financing lease right-of-use assets, and capital lease liabilities previously included in Short-term debt and Long-term debt were reclassified to financing lease liabilities in our Condensed Consolidated Balance Sheet. • Certain line items in the Condensed Consolidated Statements of Cash Flows and the “Supplementary disclosure of cash flow information” have been renamed to align with the new terminology presented in the new lease standard; “Repayment of capital lease obligations” is now presenting as “ Repayments of financing lease obligations ” and “Assets acquired under capital lease obligations” is now presenting as “Financing lease right-of-use assets obtained in exchange for lease obligations.” In the “Operating Activities” section of the Condensed Consolidated Statements of Cash Flows we have added “Operating lease right-of-use assets” and “Short and long-term operating lease liabilities” which represent the change in the operating lease asset and liability, respectively. Additionally, in the “Supplemental disclosure of cash flow information” section of the Condensed Consolidated Statements of Cash Flows we have added “Operating lease payments,” and in the “Noncash investing and financing activities” section we have added “Operating lease right-of-use assets obtained in exchange for lease obligations.” • In determining the discount rate used to measure the right-of-use asset and lease liability, we use rates implicit in the lease, or if not readily available, we use our incremental borrowing rate. Our incremental borrowing rate is based on an estimated secured rate comprised of a risk-free LIBOR rate plus a credit spread as secured by our assets. • Certain of our lease agreements include rental payments based on changes in the consumer price index (“CPI”). Lease liabilities are not remeasured as a result of changes in the CPI; instead, changes in the CPI are treated as variable lease payments and are excluded from the measurement of the right-of-use asset and lease liability. These payments are recognized in the period in which the related obligation was incurred. Our lease agreements do not contain any material residual value guarantees or material restrictive covenants. • We elected the use of hindsight whereby we applied current lease term assumptions that are applied to new leases in determining the expected lease term period for all cell sites. Upon adoption of the new lease standard and application of hindsight, our expected lease term has shortened to reflect payments due for the initial non-cancelable lease term only. This assessment corresponds to our lease term assessment for new leases and aligns with the payments that have been disclosed as lease commitments in prior years. As a result, the average remaining lease term for cell sites has decreased from approximately nine to five years based on lease contracts in effect at transition on January 1, 2019. The aggregate impact of using the hindsight is an estimated decrease in Total operating expense of $240 million in fiscal year 2019. • We were also required to reassess the previously failed sale-leasebacks of certain T-Mobile-owned wireless communication tower sites and determine whether the transfer of the assets to the tower operator under the arrangement met the transfer of control criteria in the revenue standard and whether a sale should be recognized. • We concluded that a sale has not occurred for the 6,200 tower sites transferred to Crown Castle International Corp. (“CCI”) pursuant to a master prepaid lease arrangement; therefore, these sites will continue to be accounted for as failed sale-leasebacks. • We concluded that a sale should be recognized for the 900 tower sites transferred to CCI pursuant to the sale of a subsidiary and for the 500 tower sites transferred to Phoenix Tower International (“PTI”). Upon adoption on January 1, 2019, we derecognized our existing long-term financial obligation and the tower-related property and equipment associated with these 1,400 previously failed sale-leaseback tower sites and recognized a lease liability and right-of-use asset for the leaseback of the tower sites. The estimated impacts from the change in accounting conclusion are primarily a decrease in Other revenues of $44 million and a decrease in Interest expense of $34 million in fiscal year 2019. • Rental revenues and expenses associated with co-location tower sites are presented on a net basis under the new lease standard. These revenues and expenses were presented on a gross basis under the former lease standard. Including the impacts from a change in the accounting conclusion on the 1,400 previously failed sale-leaseback tower sites, the cumulative effect of initially applying the new lease standard on January 1, 2019 is as follows: January 1, 2019 (in millions) Beginning Balance Cumulative Effect Adjustment Beginning Balance, As Adjusted Assets Other current assets $ 1,676 $ (78 ) $ 1,598 Property and equipment, net 23,359 (2,339 ) 21,020 Operating lease right-of-use assets — 9,251 9,251 Financing lease right-of-use assets — 2,271 2,271 Other intangible assets, net 198 (12 ) 186 Other assets 1,623 (71 ) 1,552 Liabilities and Stockholders’ Equity Accounts payable and accrued liabilities 7,741 (65 ) 7,676 Other current liabilities 787 28 815 Short-term and long-term debt 12,965 (2,015 ) 10,950 Tower obligations 2,557 (345 ) 2,212 Deferred tax liabilities 4,472 231 4,703 Deferred rent expense 2,781 (2,781 ) — Short-term and long-term operating lease liabilities — 11,364 11,364 Short-term and long-term financing lease liabilities — 2,016 2,016 Other long-term liabilities 967 (64 ) 903 Accumulated deficit $ (12,954 ) $ 653 $ (12,301 ) Including the impacts from the change in the accounting conclusion on the 1,400 previously failed sale-leaseback tower sites and the change in presentation on the income statement of the 6,200 tower sites for which a sale did not occur, the cumulative effects of initially applying the new lease standard for fiscal year 2019 are estimated as follows: • The aggregate impact is a decrease in Other revenues of $185 million , a decrease in Total operating expense s of $380 million , a decrease in Interest expense of $34 million and an increase to Net income of $175 million . • The expected impact on our Condensed Consolidated Statements of Cash Flows is a decrease in Net cash provided by operating activities of $10 million and a decrease in Net cash used in financing activities of $10 million . For arrangements where we are the lessor, including arrangements to lease devices to our service customers, the adoption of the new lease standard did not have a material impact on our financial statements as these leases are classified as operating leases. Device lease payments are presented as Equipment revenues and recognized as earned on a straight-line basis over the lease term. Recognition of equipment revenue on lease contracts that are determined to not be probable of collection are limited to the amount of payments received. We have made an accounting policy election to exclude from the consideration in the contract all taxes assessed by a governmental authority that are both imposed on and concurrent with a specific revenue-producing transaction and collected by us from a customer (for example, sales, use, value added, and some excise taxes). At operating lease inception, leased wireless devices are transferred from Inventory to Property and equipment, net. Leased wireless devices are depreciated to their estimated residual value over the period expected to provide utility to us, which is generally shorter than the lease term and considers expected losses. Returned devices transferred from Property and equipment, net, are recorded as Inventory and are valued at the lower of cost or market with any write-down to market recognized as Cost of equipment sales in our Consolidated Statements of Comprehensive Income. We do not have any leasing transactions with related parties. See Note 11 - Leases for further information. We have implemented significant new lease accounting systems, processes and internal controls over lease accounting to assist us in the application of the new lease standard. Accounting Pronouncements Not Yet Adopted Financial Instruments In June 2016, the FASB issued ASU 2016-13, “Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments,” and has since modified the standard with several ASUs (collectively, the “new credit loss standard”). The new credit loss standard requires a financial asset (or a group of financial assets) measured at amortized cost basis to be presented at the net amount expected to be collected. The measurement of expected credit losses is based on relevant information about past events, including historical experience, current conditions and reasonable and supportable forecasts that affect the collectibility of the reported amount. The new credit loss standard will become effective for us beginning January 1, 2020, and will require a cumulative-effect adjustment to Accumulated deficit as of the beginning of the first reporting period in which the guidance is effective (that is, a modified-retrospective approach). We are in the process of developing an expected credit loss model, identifying forward-looking loss indicators and assessing the impact on our receivables portfolio. We will adopt the new credit loss standard on January 1, 2020. Cloud Computing Arrangements In August 2018, the FASB issued ASU 2018-15, “Intangibles - Goodwill and Other - Internal-Use Software (Topic 350): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement that is a Service Contract.” The standard aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software. The standard will become effective for us beginning January 1, 2020, and can be applied either retrospectively or prospectively to all implementation costs incurred after the date of adoption. We are currently evaluating the impact this guidance will have on our Consolidated Financial Statements. We will adopt the standard on January 1, 2020. Other recent accounting pronouncements issued by the FASB (including its Emerging Issues Task Force), the American Institute of Certified Public Accountants, and the Securities and Exchange Commission (the “SEC”) did not have, or are not expected to have, a significant impact on our present or future Consolidated Financial Statements.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	6 Months Ended
	Jun. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Financial Statement Impacts of Applying New Accounting Standard	Including the impacts from a change in the accounting conclusion on the 1,400 previously failed sale-leaseback tower sites, the cumulative effect of initially applying the new lease standard on January 1, 2019 is as follows: January 1, 2019 (in millions) Beginning Balance Cumulative Effect Adjustment Beginning Balance, As Adjusted Assets Other current assets $ 1,676 $ (78 ) $ 1,598 Property and equipment, net 23,359 (2,339 ) 21,020 Operating lease right-of-use assets — 9,251 9,251 Financing lease right-of-use assets — 2,271 2,271 Other intangible assets, net 198 (12 ) 186 Other assets 1,623 (71 ) 1,552 Liabilities and Stockholders’ Equity Accounts payable and accrued liabilities 7,741 (65 ) 7,676 Other current liabilities 787 28 815 Short-term and long-term debt 12,965 (2,015 ) 10,950 Tower obligations 2,557 (345 ) 2,212 Deferred tax liabilities 4,472 231 4,703 Deferred rent expense 2,781 (2,781 ) — Short-term and long-term operating lease liabilities — 11,364 11,364 Short-term and long-term financing lease liabilities — 2,016 2,016 Other long-term liabilities 967 (64 ) 903 Accumulated deficit $ (12,954 ) $ 653 $ (12,301 )

Receivables and Allowance for_2

Receivables and Allowance for Credit Losses (Tables)	6 Months Ended
	Jun. 30, 2019
Receivables [Abstract]
Schedule of Equipment Installment Plan Receivables	The following table summarizes the EIP receivables, including imputed discounts and related allowance for credit losses: (in millions) June 30, December 31, EIP receivables, gross $ 4,490 $ 4,534 Unamortized imputed discount (335 ) (330 ) EIP receivables, net of unamortized imputed discount 4,155 4,204 Allowance for credit losses (105 ) (119 ) EIP receivables, net $ 4,050 $ 4,085 Classified on the balance sheet as: Equipment installment plan receivables, net $ 2,446 $ 2,538 Equipment installment plan receivables due after one year, net 1,604 1,547 EIP receivables, net $ 4,050 $ 4,085
Schedule of Unamortized Imputed Discount and Allowance for Credit Losses for Equipment Installment Plan Receivables	Activity for the six months ended June 30, 2019 and 2018 , in the allowance for credit losses and unamortized imputed discount balances for the accounts receivable and EIP receivables segments were as follows: June 30, 2019 June 30, 2018 (in millions) Accounts Receivable Allowance EIP Receivables Allowance Total Accounts Receivable Allowance EIP Receivables Allowance Total Allowance for credit losses and imputed discount, beginning of period $ 67 $ 449 $ 516 $ 86 $ 396 $ 482 Bad debt expense 31 113 144 25 103 128 Write-offs, net of recoveries (37 ) (127 ) (164 ) (41 ) (119 ) (160 ) Change in imputed discount on short-term and long-term EIP receivables N/A 89 89 N/A 102 102 Impact on the imputed discount from sales of EIP receivables N/A (84 ) (84 ) N/A (98 ) (98 ) Allowance for credit losses and imputed discount, end of period $ 61 $ 440 $ 501 $ 70 $ 384 $ 454
Schedule of Equipment Installment Plan Receivables by Credit Category	The following table provides delinquency status for the unpaid principal balance for receivables within the EIP portfolio segment, which we actively monitor as part of our current credit risk management practices and policies: June 30, 2019 December 31, 2018 (in millions) Prime Subprime Total EIP Receivables, gross Prime Subprime Total EIP Receivables, gross Current - 30 days past due $ 2,222 $ 2,177 $ 4,399 $ 1,987 $ 2,446 $ 4,433 31 - 60 days past due 14 30 44 15 32 47 61 - 90 days past due 6 17 23 6 19 25 More than 90 days past due 7 17 24 7 22 29 Total receivables, gross $ 2,249 $ 2,241 $ 4,490 $ 2,015 $ 2,519 $ 4,534

Sales of Certain Receivables (T

Sales of Certain Receivables (Tables)	6 Months Ended
	Jun. 30, 2019
Transfers and Servicing [Abstract]
Schedule of Variable Interest Entities	The following table summarizes the carrying amounts and classification of assets, which consists primarily of the deferred purchase price and liabilities included in our Condensed Consolidated Balance Sheets that relate to our variable interest in the Service VIE: (in millions) June 30, December 31, Other current assets $ 351 $ 339 Accounts payable and accrued liabilities — 59 Other current liabilities 293 149
Schedule of variable interest entities - EIP	The following table summarizes the carrying amounts and classification of assets, which consists primarily of the deferred purchase price and liabilities included in our Condensed Consolidated Balance Sheets that relate to the EIP BRE: (in millions) June 30, December 31, Other current assets $ 340 $ 321 Other assets 74 88 Other long-term liabilities 23 22
Schedule of Factoring Arrangement	The following table summarizes the impact of the sale of certain service receivables and EIP receivables in our Condensed Consolidated Balance Sheets : (in millions) June 30, December 31, Derecognized net service receivables and EIP receivables $ 2,616 $ 2,577 Other current assets 691 660 of which, deferred purchase price 689 658 Other long-term assets 74 88 of which, deferred purchase price 74 88 Accounts payable and accrued liabilities — 59 Other current liabilities 293 149 Other long-term liabilities 23 22 Net cash proceeds since inception 1,956 1,879 Of which: Change in net cash proceeds during the year-to-date period 77 (179 ) Net cash proceeds funded by reinvested collections 1,879 2,058

Spectrum License Transactions (

Spectrum License Transactions (Tables)	6 Months Ended
	Jun. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Spectrum Licenses	The following table summarizes our spectrum license activity for the six months ended June 30, 2019 : (in millions) 2019 Balance at December 31, 2018 $ 35,559 Spectrum license acquisitions 857 Spectrum licenses transferred to held for sale — Costs to clear spectrum 14 Balance at June 30, 2019 $ 36,430

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2019
Fair Value Disclosures [Abstract]
Schedule of Carrying Values and Fair Values of Long-term Debt	The carrying amounts and fair values of our assets measured at fair value on a recurring basis included in our Condensed Consolidated Balance Sheets were as follows: Level within the Fair Value Hierarchy June 30, 2019 December 31, 2018 (in millions) Carrying Amount Fair Value Carrying Amount Fair Value Assets: Deferred purchase price assets 3 $ 763 $ 763 $ 746 $ 746 The carrying amounts and fair values of our short-term and long-term debt included in our Condensed Consolidated Balance Sheets were as follows: Level within the Fair Value Hierarchy June 30, 2019 December 31, 2018 (in millions) Carrying Amount Fair Value Carrying Amount Fair Value Liabilities: Senior Notes to third parties 1 $ 10,954 $ 11,485 $ 10,950 $ 10,945 Senior Notes to affiliates 2 9,985 10,344 9,984 9,802 Incremental Term Loan Facility to affiliates 2 4,000 4,000 4,000 3,976 Senior Reset Notes to affiliates 2 — — 598 640

Tower Obligations (Tables)

Tower Obligations (Tables)	6 Months Ended
	Jun. 30, 2019
Leases [Abstract]
Summary of Impacts to Consolidated Balance Sheets	The following table summarizes the balances of the failed sale-leasebacks in the Condensed Consolidated Balance Sheets : (in millions) June 30, December 31, Property and equipment, net $ 224 $ 329 Tower obligations 2,247 2,557

Revenue from Contracts with C_2

Revenue from Contracts with Customers (Tables)	6 Months Ended
	Jun. 30, 2019
Revenue from Contract with Customer [Abstract]
Schedule of Disaggregation of Revenue	Branded postpaid service revenues, including branded postpaid phone revenues and branded postpaid other revenues, were as follows: Three Months Ended June 30, Six Months Ended June 30, (in millions) 2019 2018 2019 2018 Branded postpaid service revenues Branded postpaid phone revenues $ 5,287 $ 4,892 $ 10,470 $ 9,703 Branded postpaid other revenues 326 272 636 531 Total branded postpaid service revenues $ 5,613 $ 5,164 $ 11,106 $ 10,234 Equipment revenues from the lease of mobile communication devices were as follows: Three Months Ended June 30, Six Months Ended June 30, (in millions) 2019 2018 2019 2018 Equipment revenues from the lease of mobile communication devices $ 143 $ 177 $ 304 $ 348
Schedule of Contract Liability and Receivable Balances	The opening and closing balances of our contract asset and contract liability balances from contracts with customers as of December 31, 2018 and June 30, 2019 , were as follows: (in millions) Contract Assets Included in Other Current Assets Contract Liabilities Included in Deferred Revenue Balance as of December 31, 2018 $ 51 $ 645 Balance as of June 30, 2019 42 571 Change $ (9 ) $ (74 ) Revenues for the three and six months ended June 30, 2019 and 2018, include the following: Three Months Ended June 30, Six Months Ended June 30, (in millions) 2019 2018 2019 2018 Amounts included in the beginning of period contract liability balance $ 43 $ 31 $ 603 $ 559

Earnings Per Share (Tables)

Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 2019
Earnings Per Share [Abstract]
Schedule of Earnings Per Share	The computation of basic and diluted earnings per share was as follows: Three Months Ended June 30, Six Months Ended June 30, (in millions, except shares and per share amounts) 2019 2018 2019 2018 Net income $ 939 $ 782 $ 1,847 $ 1,453 Weighted average shares outstanding - basic 854,368,443 847,660,488 852,796,369 851,420,686 Effect of dilutive securities: Outstanding stock options and unvested stock awards 5,767,150 4,380,182 8,094,501 7,308,146 Weighted average shares outstanding - diluted 860,135,593 852,040,670 860,890,870 858,728,832 Earnings per share - basic $ 1.10 $ 0.92 $ 2.16 $ 1.71 Earnings per share - diluted $ 1.09 $ 0.92 $ 2.14 $ 1.69 Potentially dilutive securities: Outstanding stock options and unvested stock awards 67,856 797,948 39,342 487,133

Leases (Tables)

Leases (Tables)	6 Months Ended
	Jun. 30, 2019
Leases [Abstract]
Components of Lease Expense	The components of lease expense were as follows: (in millions) Three Months Ended June 30, 2019 Six Months Ended June 30, 2019 Operating lease expense $ 634 $ 1,236 Financing lease expense: Amortization of right-of-use assets 117 230 Interest on lease liabilities 20 40 Total financing lease expense 137 270 Variable lease expense 58 123 Total lease expense $ 829 $ 1,629
Schedule of Information Relating to Lease Term and Discount Rate	Information relating to the lease term and discount rate is as follows: June 30, 2019 Weighted Average Remaining Lease Term (Years) Operating leases 6 Financing leases 3 Weighted Average Discount Rate Operating leases 5.2 % Financing leases 3.9 %
Maturity Schedule of Operating Lease Liabilities	Maturities of lease liabilities as of June 30, 2019, were as follows: (in millions) Operating Leases Finance Leases Twelve Months Ending June 30, 2020 $ 2,403 $ 1,021 2021 2,761 713 2022 2,503 430 2023 2,088 126 2024 1,449 58 Thereafter 3,543 91 Total lease payments 14,747 2,439 Less imputed interest 2,334 162 Total $ 12,413 $ 2,277
Maturity Schedule of Finance Lease Liabilities	Maturities of lease liabilities as of June 30, 2019, were as follows: (in millions) Operating Leases Finance Leases Twelve Months Ending June 30, 2020 $ 2,403 $ 1,021 2021 2,761 713 2022 2,503 430 2023 2,088 126 2024 1,449 58 Thereafter 3,543 91 Total lease payments 14,747 2,439 Less imputed interest 2,334 162 Total $ 12,413 $ 2,277
Schedule of Leased Wireless Devices	The components of leased wireless devices under our JUMP! On Demand program were as follows: (in millions) June 30, December 31, Leased wireless devices, gross $ 988 $ 1,159 Accumulated depreciation (570 ) (622 ) Leased wireless devices, net $ 418 $ 537
Schedule of Future Minimum Payments Expected to be Received (under 842)	Future minimum payments expected to be received over the lease term related to the leased wireless devices, which exclude optional residual buy-out amounts at the end of the lease term, are summarized below: (in millions) Total Twelve Months Ending June 30, 2020 $ 318 2021 47 Total $ 365
Schedule of Future Minimum Payments Expected to be Received (under 840)	As of December 31, 2018, the future minimum payments expected to be received over the lease term related to the leased wireless devices, which exclude optional residual buy-out amounts at the end of the lease term, are summarized below: (in millions) Total Year Ended December 31, 2019 $ 419 2020 59 Total $ 478
Schedule of Future Minimum Lease Payments for Capital Leases	As of December 31, 2018, the future minimum payments required under capital leases, including interest and maintenance, over their remaining terms are summarized below: (in millions) Future Minimum Payments Year Ended December 31, 2019 $ 909 2020 631 2021 389 2022 102 2023 66 Thereafter 106 Total $ 2,203 Included in Total Interest $ 143 Maintenance 45

Guarantor Financial Informati_2

Guarantor Financial Information (Tables)	6 Months Ended
	Jun. 30, 2019
Condensed Financial Information Disclosure [Abstract]
Schedule of Condensed Consolidating Balance Sheet Information	Condensed Consolidating Balance Sheet Information June 30, 2019 (in millions) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Consolidating and Eliminating Adjustments Consolidated Assets Current assets Cash and cash equivalents $ 4 $ 2 $ 970 $ 129 $ — $ 1,105 Accounts receivable, net — — 1,526 291 — 1,817 Equipment installment plan receivables, net — — 2,446 — — 2,446 Accounts receivable from affiliates — — 18 — — 18 Inventory — — 998 — — 998 Other current assets — — 1,052 678 — 1,730 Total current assets 4 2 7,010 1,098 — 8,114 Property and equipment, net (1) — — 21,535 312 — 21,847 Operating lease right-of-use assets — — 10,436 3 — 10,439 Financing lease right-of-use assets — — 2,589 — — 2,589 Goodwill — — 1,683 218 — 1,901 Spectrum licenses — — 36,430 — — 36,430 Other intangible assets, net — — 85 72 — 157 Investments in subsidiaries, net 27,332 49,416 — — (76,748 ) — Intercompany receivables and note receivables — 4,618 — — (4,618 ) — Equipment installment plan receivables due after one year, net — — 1,604 — — 1,604 Other assets — 8 1,637 226 (164 ) 1,707 Total assets $ 27,336 $ 54,044 $ 83,009 $ 1,929 $ (81,530 ) $ 84,788 Liabilities and Stockholders' Equity Current liabilities Accounts payable and accrued liabilities $ — $ 229 $ 6,736 $ 295 $ — $ 7,260 Payables to affiliates — 147 51 — — 198 Short-term debt — 300 — — — 300 Deferred revenue — — 619 1 — 620 Short-term operating lease liabilities — — 2,265 3 — 2,268 Short-term financing lease liabilities — — 963 — — 963 Other current liabilities — 1,097 154 313 — 1,564 Total current liabilities — 1,773 10,788 612 — 13,173 Long-term debt — 10,954 — — — 10,954 Long-term debt to affiliates — 13,985 — — — 13,985 Tower obligations (1) — — 76 2,171 — 2,247 Deferred tax liabilities — — 5,254 — (164 ) 5,090 Operating lease liabilities — — 10,145 — — 10,145 Financing lease liabilities — — 1,314 — — 1,314 Negative carrying value of subsidiaries, net — — 815 — (815 ) — Intercompany payables and debt 369 — 3,872 377 (4,618 ) — Other long-term liabilities — — 890 23 — 913 Total long-term liabilities 369 24,939 22,366 2,571 (5,597 ) 44,648 Total stockholders' equity (deficit) 26,967 27,332 49,855 (1,254 ) (75,933 ) 26,967 Total liabilities and stockholders' equity $ 27,336 $ 54,044 $ 83,009 $ 1,929 $ (81,530 ) $ 84,788 (1) Assets and liabilities for Non-Guarantor Subsidiaries are primarily included in VIEs related to the 2012 Tower Transaction. See Note 8 – Tower Obligations for further information. Condensed Consolidating Balance Sheet Information December 31, 2018 (in millions) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Consolidating and Eliminating Adjustments Consolidated Assets Current assets Cash and cash equivalents $ 2 $ 1 $ 1,079 $ 121 $ — $ 1,203 Accounts receivable, net — — 1,510 259 — 1,769 Equipment installment plan receivables, net — — 2,538 — — 2,538 Accounts receivable from affiliates — — 11 — — 11 Inventory — — 1,084 — — 1,084 Other current assets — — 1,031 645 — 1,676 Total current assets 2 1 7,253 1,025 — 8,281 Property and equipment, net (1) — — 23,062 297 — 23,359 Goodwill — — 1,683 218 — 1,901 Spectrum licenses — — 35,559 — — 35,559 Other intangible assets, net — — 116 82 — 198 Investments in subsidiaries, net 25,314 46,516 — — (71,830 ) — Intercompany receivables and note receivables — 5,174 — — (5,174 ) — Equipment installment plan receivables due after one year, net — — 1,547 — — 1,547 Other assets — 7 1,540 221 (145 ) 1,623 Total assets $ 25,316 $ 51,698 $ 70,760 $ 1,843 $ (77,149 ) $ 72,468 Liabilities and Stockholders' Equity Current liabilities Accounts payable and accrued liabilities $ — $ 228 $ 7,240 $ 273 $ — $ 7,741 Payables to affiliates — 157 43 — — 200 Short-term debt — — 841 — — 841 Deferred revenue — — 698 — — 698 Other current liabilities — 447 164 176 — 787 Total current liabilities — 832 8,986 449 — 10,267 Long-term debt — 10,950 1,174 — — 12,124 Long-term debt to affiliates — 14,582 — — — 14,582 Tower obligations (1) — — 384 2,173 — 2,557 Deferred tax liabilities — — 4,617 — (145 ) 4,472 Deferred rent expense — — 2,781 — — 2,781 Negative carrying value of subsidiaries, net — — 676 — (676 ) — Intercompany payables and debt 598 — 4,234 342 (5,174 ) — Other long-term liabilities — 20 926 21 — 967 Total long-term liabilities 598 25,552 14,792 2,536 (5,995 ) 37,483 Total stockholders' equity (deficit) 24,718 25,314 46,982 (1,142 ) (71,154 ) 24,718 Total liabilities and stockholders' equity $ 25,316 $ 51,698 $ 70,760 $ 1,843 $ (77,149 ) $ 72,468 (1) Assets and liabilities for Non-Guarantor Subsidiaries are primarily included in VIEs related to the 2012 Tower Transaction. See Note 8 – Tower Obligations for further information.
Schedule of Condensed Consolidating Statement of Comprehensive Income Information	Condensed Consolidating Statement of Comprehensive Income Information Three Months Ended June 30, 2019 (in millions) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Consolidating and Eliminating Adjustments Consolidated Revenues Service revenues $ — $ — $ 7,992 $ 767 $ (333 ) $ 8,426 Equipment revenues — — 2,320 2 (59 ) 2,263 Other revenues — 3 276 51 (40 ) 290 Total revenues — 3 10,588 820 (432 ) 10,979 Operating expenses Cost of services, exclusive of depreciation and amortization shown separately below — — 1,668 9 (28 ) 1,649 Cost of equipment sales, exclusive of depreciation and amortization shown separately below — — 2,418 302 (59 ) 2,661 Selling, general and administrative — — 3,595 293 (345 ) 3,543 Depreciation and amortization — — 1,564 21 — 1,585 Total operating expense — — 9,245 625 (432 ) 9,438 Operating income — 3 1,343 195 — 1,541 Other income (expense) Interest expense — (114 ) (21 ) (47 ) — (182 ) Interest expense to affiliates — (102 ) (4 ) — 5 (101 ) Interest income — 5 3 1 (5 ) 4 Other expense, net — (19 ) (3 ) — — (22 ) Total other expense, net — (230 ) (25 ) (46 ) — (301 ) Income (loss) before income taxes — (227 ) 1,318 149 — 1,240 Income tax expense — — (270 ) (31 ) — (301 ) Earnings of subsidiaries 939 1,166 10 — (2,115 ) — Net income $ 939 $ 939 $ 1,058 $ 118 $ (2,115 ) $ 939 Net income $ 939 $ 939 $ 1,058 $ 118 $ (2,115 ) $ 939 Other comprehensive (loss) income, net of tax Other comprehensive (loss) income, net of tax (292 ) (292 ) 103 — 189 (292 ) Total comprehensive income $ 647 $ 647 $ 1,161 $ 118 $ (1,926 ) $ 647 Condensed Consolidating Statement of Comprehensive Income Information Three Months Ended June 30, 2018 (in millions) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Consolidating and Eliminating Adjustments Consolidated Revenues Service revenues $ — $ — $ 7,609 $ 551 $ (229 ) $ 7,931 Equipment revenues — — 2,370 1 (46 ) 2,325 Other revenues — 2 267 55 (9 ) 315 Total revenues — 2 10,246 607 (284 ) 10,571 Operating expenses Cost of services, exclusive of depreciation and amortization shown separately below — — 1,522 8 — 1,530 Cost of equipment sales, exclusive of depreciation and amortization shown separately below — — 2,556 262 (46 ) 2,772 Selling, general and administrative — 6 3,201 216 (238 ) 3,185 Depreciation and amortization — — 1,611 23 — 1,634 Total operating expenses — 6 8,890 509 (284 ) 9,121 Operating income (loss) — (4 ) 1,356 98 — 1,450 Other income (expense) Interest expense — (120 ) (28 ) (48 ) — (196 ) Interest expense to affiliates — (129 ) (4 ) — 5 (128 ) Interest income — 6 4 1 (5 ) 6 Other expense, net — (59 ) (5 ) — — (64 ) Total other expense, net — (302 ) (33 ) (47 ) — (382 ) Income (loss) before income taxes — (306 ) 1,323 51 — 1,068 Income tax expense — — (277 ) (9 ) — (286 ) Earnings of subsidiaries 782 1,088 23 — (1,893 ) — Net income $ 782 $ 782 $ 1,069 $ 42 $ (1,893 ) $ 782 Other comprehensive income (loss), net of tax Other comprehensive income, net of tax 3 3 3 — (6 ) 3 Total comprehensive income $ 785 $ 785 $ 1,072 $ 42 $ (1,899 ) $ 785 Condensed Consolidating Statement of Comprehensive Income Information Six Months Ended June 30, 2019 (in millions) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Consolidating and Eliminating Adjustments Consolidated Revenues Service revenues $ — $ — $ 15,851 $ 1,499 $ (647 ) $ 16,703 Equipment revenues — — 4,890 2 (113 ) 4,779 Other revenues — 9 549 101 (82 ) 577 Total revenues — 9 21,290 1,602 (842 ) 22,059 Operating expenses Cost of services, exclusive of depreciation and amortization shown separately below — — 3,236 15 (56 ) 3,195 Cost of equipment sales, exclusive of depreciation and amortization shown separately below — — 5,216 574 (113 ) 5,677 Selling, general and administrative — 1 7,089 568 (673 ) 6,985 Depreciation and amortization — — 3,142 43 — 3,185 Total operating expense — 1 18,683 1,200 (842 ) 19,042 Operating income — 8 2,607 402 — 3,017 Other income (expense) Interest expense — (226 ) (41 ) (94 ) — (361 ) Interest expense to affiliates — (211 ) (9 ) — 10 (210 ) Interest income — 10 10 2 (10 ) 12 Other expense, net — (11 ) (4 ) — — (15 ) Total other expense, net — (438 ) (44 ) (92 ) — (574 ) Income (loss) before income taxes — (430 ) 2,563 310 — 2,443 Income tax expense — — (531 ) (65 ) — (596 ) Earnings of subsidiaries 1,847 2,277 17 — (4,141 ) — Net income $ 1,847 $ 1,847 $ 2,049 $ 245 $ (4,141 ) $ 1,847 Net income $ 1,847 $ 1,847 $ 2,049 $ 245 $ (4,141 ) $ 1,847 Other comprehensive (loss) income, net of tax Other comprehensive (loss) income, net of tax (481 ) (481 ) 168 — 313 (481 ) Total comprehensive income $ 1,366 $ 1,366 $ 2,217 $ 245 $ (3,828 ) $ 1,366 Condensed Consolidating Statement of Comprehensive Income Information Six Months Ended June 30, 2018 (in millions) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Consolidating and Eliminating Adjustments Consolidated Revenues Service revenues $ — $ — $ 15,096 $ 1,091 $ (450 ) $ 15,737 Equipment revenues — — 4,777 1 (100 ) 4,678 Other revenues — 3 516 110 (18 ) 611 Total revenues — 3 20,389 1,202 (568 ) 21,026 Operating expenses Cost of services, exclusive of depreciation and amortization shown separately below — — 3,102 17 — 3,119 Cost of equipment sales, exclusive of depreciation and amortization shown separately below — — 5,220 498 (101 ) 5,617 Selling, general and administrative — 6 6,358 452 (467 ) 6,349 Depreciation and amortization — — 3,165 44 — 3,209 Total operating expenses — 6 17,845 1,011 (568 ) 18,294 Operating income (loss) — (3 ) 2,544 191 — 2,732 Other income (expense) Interest expense — (294 ) (57 ) (96 ) — (447 ) Interest expense to affiliates — (295 ) (9 ) — 10 (294 ) Interest income — 12 9 1 (10 ) 12 Other (expense) income, net — (91 ) 37 — — (54 ) Total other expense, net — (668 ) (20 ) (95 ) — (783 ) Income (loss) before income taxes — (671 ) 2,524 96 — 1,949 Income tax expense — — (476 ) (20 ) — (496 ) Earnings of subsidiaries 1,453 2,124 17 — (3,594 ) — Net income $ 1,453 $ 1,453 $ 2,065 $ 76 $ (3,594 ) $ 1,453 Net income $ 1,453 $ 1,453 $ 2,065 $ 76 $ (3,594 ) $ 1,453 Other comprehensive loss, net of tax Other comprehensive loss, net of tax — — — — — — Total comprehensive income $ 1,453 $ 1,453 $ 2,065 $ 76 $ (3,594 ) $ 1,453
Schedule of Condensed Consolidating Statement of Cash Flows Information	Condensed Consolidating Statement of Cash Flows Information Three Months Ended June 30, 2019 (in millions) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Consolidating and Eliminating Adjustments Consolidated Operating activities Net cash (used in) provided by operating activities $ — $ (124 ) $ 3,112 $ (686 ) $ (155 ) $ 2,147 Investing activities Purchases of property and equipment — — (1,740 ) (49 ) — (1,789 ) Purchases of spectrum licenses and other intangible assets, including deposits — — (665 ) — — (665 ) Proceeds related to beneficial interests in securitization transactions — — 8 831 — 839 Net cash (used in) provided by investing activities — — (2,397 ) 782 — (1,615 ) Financing activities Proceeds from borrowing on revolving credit facility, net — 880 — — — 880 Repayments of revolving credit facility — — (880 ) — — (880 ) Repayments of financing lease obligations — — (229 ) — — (229 ) Repayments of long-term debt — — (600 ) — — (600 ) Intercompany advances, net — (756 ) 688 68 — — Tax withholdings on share-based awards — — (4 ) — — (4 ) Cash payments for debt prepayment or debt extinguishment costs — — (28 ) — — (28 ) Intercompany dividend paid — — — (155 ) 155 — Other, net 1 — (6 ) — — (5 ) Net cash provided (used in) by financing activities 1 124 (1,059 ) (87 ) 155 (866 ) Change in cash and cash equivalents 1 — (344 ) 9 — (334 ) Cash and cash equivalents Beginning of period 3 2 1,314 120 — 1,439 End of period $ 4 $ 2 $ 970 $ 129 $ — $ 1,105 Condensed Consolidating Statement of Cash Flows Information Three Months Ended June 30, 2018 (in millions) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Consolidating and Eliminating Adjustments Consolidated Operating activities Net cash (used in) provided by operating activities $ (1 ) $ (258 ) $ 2,932 $ (1,282 ) $ (130 ) $ 1,261 Investing activities Purchases of property and equipment — — (1,624 ) (5 ) — (1,629 ) Purchases of spectrum licenses and other intangible assets, including deposits — — (28 ) — — (28 ) Proceeds related to beneficial interests in securitization transactions — — 12 1,311 — 1,323 Acquisition of companies, net of cash acquired — — (5 ) — — (5 ) Equity investment in subsidiary — — (26 ) — 26 — Other, net — — 33 — — 33 Net cash (used in) provided by investing activities — — (1,638 ) 1,306 26 (306 ) Financing activities Payments of consent fees related to long-term debt — — (38 ) — — (38 ) Proceeds from borrowing on revolving credit facility, net — 2,070 — — — 2,070 Repayments of revolving credit facility — — (2,195 ) — — (2,195 ) Repayments of financing lease obligations — — (154 ) (1 ) — (155 ) Repayments of long-term debt — — (2,350 ) — — (2,350 ) Repurchases of common stock (405 ) — — — — (405 ) Intercompany advances, net 405 (1,810 ) 1,406 (1 ) — — Equity investment from parent — — — 26 (26 ) — Tax withholdings on share-based awards — — (10 ) — — (10 ) Cash payments for debt prepayment or debt extinguishment costs — — (181 ) — — (181 ) Intercompany dividend paid — — — (130 ) 130 — Other, net 1 — (4 ) — — (3 ) Net cash provided (used in) by financing activities 1 260 (3,526 ) (106 ) 104 (3,267 ) Change in cash and cash equivalents — 2 (2,232 ) (82 ) — (2,312 ) Cash and cash equivalents Beginning of period 1 1 2,395 130 — 2,527 End of period $ 1 $ 3 $ 163 $ 48 $ — $ 215 Condensed Consolidating Statement of Cash Flows Information Six Months Ended June 30, 2019 (in millions) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Consolidating and Eliminating Adjustments Consolidated Operating activities Net cash (used in) provided by operating activities $ — $ (372 ) $ 5,909 $ (1,703 ) $ (295 ) $ 3,539 Investing activities Purchases of property and equipment — — (3,666 ) (54 ) — (3,720 ) Purchases of spectrum licenses and other intangible assets, including deposits — — (850 ) — — (850 ) Proceeds related to beneficial interests in securitization transactions — — 17 1,979 — 1,996 Other, net — — (7 ) — — (7 ) Net cash (used in) provided by investing activities — — (4,506 ) 1,925 — (2,581 ) Financing activities Proceeds from borrowing on revolving credit facility, net — 1,765 — — — 1,765 Repayments of revolving credit facility — — (1,765 ) — — (1,765 ) Repayments of financing lease obligations — — (314 ) (1 ) — (315 ) Repayments of long-term debt — — (600 ) — — (600 ) Intercompany advances, net — (1,392 ) 1,310 82 — — Tax withholdings on share-based awards — — (104 ) — — (104 ) Cash payments for debt prepayment or debt extinguishment costs — — (28 ) — — (28 ) Intercompany dividend paid — — — (295 ) 295 — Other, net 2 — (11 ) — — (9 ) Net cash provided (used in) by financing activities 2 373 (1,512 ) (214 ) 295 (1,056 ) Change in cash and cash equivalents 2 1 (109 ) 8 — (98 ) Cash and cash equivalents Beginning of period 2 1 1,079 121 — 1,203 End of period $ 4 $ 2 $ 970 $ 129 $ — $ 1,105 Condensed Consolidating Statement of Cash Flows Information Six Months Ended June 30, 2018 (in millions) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Consolidating and Eliminating Adjustments Consolidated Operating activities Net cash (used in) provided by operating activities $ — $ (662 ) $ 5,306 $ (2,483 ) $ (130 ) $ 2,031 Investing activities Purchases of property and equipment — — (2,990 ) (5 ) — (2,995 ) Purchases of spectrum licenses and other intangible assets, including deposits — — (79 ) — — (79 ) Proceeds related to beneficial interests in securitization transactions — — 25 2,593 — 2,618 Acquisition of companies, net of cash — — (338 ) — — (338 ) Equity investment in subsidiary — — (26 ) — 26 — Other, net — — 26 — — 26 Net cash (used in) provided by investing activities — — (3,382 ) 2,588 26 (768 ) Financing activities Proceeds from issuance of long-term debt — 2,494 — — — 2,494 Payments of consent fees related to long-term debt — — (38 ) — — (38 ) Proceeds from borrowing on revolving credit facility, net — 4,240 — — — 4,240 Repayments of revolving credit facility — — (3,920 ) — — (3,920 ) Repayments of financing lease obligations — — (326 ) (1 ) — (327 ) Repayments of long-term debt — — (3,349 ) — — (3,349 ) Repurchases of common stock (1,071 ) — — — — (1,071 ) Intercompany advances, net 995 (6,070 ) 5,085 (10 ) — — Equity investment from parent — — — 26 (26 ) — Tax withholdings on share-based awards — — (84 ) — — (84 ) Cash payments for debt prepayment or debt extinguishment costs — — (212 ) — — (212 ) Intercompany dividend paid — — — (130 ) 130 — Other, net 3 — (3 ) — — — Net cash (used in) provided by financing activities (73 ) 664 (2,847 ) (115 ) 104 (2,267 ) Change in cash and cash equivalents (73 ) 2 (923 ) (10 ) — (1,004 ) Cash and cash equivalents Beginning of period 74 1 1,086 58 — 1,219 End of period $ 1 $ 3 $ 163 $ 48 $ — $ 215

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Narrative (Details) $ in Millions	Jan. 01, 2019tower_site	Jun. 30, 2019USD ($)	Jun. 30, 2018USD ($)	Jun. 30, 2019USD ($)	Jun. 30, 2018USD ($)	Dec. 31, 2019USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Average remaining lease term for cell sites		6 years		6 years
Total operating expense		$ 9,438	$ 9,121	$ 19,042	$ 18,294
Revenues		10,979	10,571	22,059	21,026
Interest expense		182	196	361	447
Net income		939	782	1,847	1,453
Net cash provided by (used in) operating activities		2,147	1,261	3,539	2,031
Net cash (used in) provided by financing activities		(866)	(3,267)	(1,056)	(2,267)
Tower Transaction
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property subject to failed sale leaseback transaction, number of units | tower_site	6,200
Other revenues
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues		$ 290	$ 315	$ 577	$ 611
CCI | Tower Transaction
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property subject to failed sale leaseback transaction, number of units | tower_site	900
PTI | Tower Transaction
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property subject to failed sale leaseback transaction, number of units | tower_site	500
CCI and PTI | Tower Transaction
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property subject to failed sale leaseback transaction, number of units | tower_site	1,400
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Average remaining lease term, operating lease	9 years
Average remaining lease term for cell sites	5 years
Accounting Standards Update 2016-02 | Scenario, Forecast | Impact Excluding Failed Sale-Leaseback Transaction
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total operating expense						$ (240)
Accounting Standards Update 2016-02 | Scenario, Forecast | Tower Transaction
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Interest expense						(34)
Accounting Standards Update 2016-02 | Scenario, Forecast | Impact Including Failed Sale-Leaseback Transaction
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total operating expense						(380)
Net income						175
Net cash provided by (used in) operating activities						(10)
Net cash (used in) provided by financing activities						(10)
Accounting Standards Update 2016-02 | Scenario, Forecast | Other revenues | Tower Transaction
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues						(44)
Accounting Standards Update 2016-02 | Scenario, Forecast | Other revenues | Impact Including Failed Sale-Leaseback Transaction
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues						$ (185)

Summary of Significant Accoun_5

Summary of Significant Accounting Policies - Schedule of Cumulative Impact of Adoption (Details) - USD ($) $ in Millions	Jun. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Assets
Other current assets	$ 1,730	$ 1,598	$ 1,676
Property and equipment, net	21,847	21,020	23,359
Operating lease right-of-use assets	10,439	9,251
Financing lease right-of-use assets	2,589	2,271
Other intangible assets, net	157	186	198
Other assets	1,707	1,552	1,623
Liabilities and Stockholders' Equity
Accounts payable and accrued liabilities	7,260	7,676	7,741
Other current liabilities	1,564	815	787
Short-term and long-term debt		10,950	12,965
Tower obligations	2,247	2,212	2,557
Deferred tax liabilities	5,090	4,703	4,472
Deferred rent expense		0	2,781
Short-term and long-term operating lease liabilities	12,413	11,364
Short-term and long-term financing lease liabilities	2,277	2,016
Other long-term liabilities	913	903	967
Accumulated deficit	$ (10,454)	(12,301)	$ (12,954)
Accounting Standards Update 2016-02
Assets
Other current assets		(78)
Property and equipment, net		(2,339)
Operating lease right-of-use assets		9,251
Financing lease right-of-use assets		2,271
Other intangible assets, net		(12)
Other assets		(71)
Liabilities and Stockholders' Equity
Accounts payable and accrued liabilities		(65)
Other current liabilities		28
Short-term and long-term debt		(2,015)
Tower obligations		(345)
Deferred tax liabilities		231
Deferred rent expense		(2,781)
Short-term and long-term operating lease liabilities		11,364
Short-term and long-term financing lease liabilities		2,016
Other long-term liabilities		(64)
Accumulated deficit		$ 653

Significant Transactions - Narr

Significant Transactions - Narrative (Details) - USD ($) $ in Millions	Apr. 29, 2019	Jun. 30, 2019	Apr. 28, 2019
Significant Transactions [Line Items]
Gain on write-off of embedded derivatives		$ 11
9.332% Senior Reset Notes to affiliates due 2023 | Affiliated Entity
Significant Transactions [Line Items]
Principal Amount			$ 600
Interest rate, stated percentage			9.332%
Redemption price (as a percent)	104.666%
Redemption premium		$ 28

Business Combinations - Narrati

Business Combinations - Narrative (Details) - USD ($)	Jul. 26, 2019	May 18, 2018	Apr. 29, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Business Acquisition [Line Items]
Payments of consent fees				$ 0	$ 38,000,000	$ 0	$ 38,000,000
DISH | Subsequent Event | T-Mobile and Sprint | Prepaid Business
Business Acquisition [Line Items]
Payments for asset acquisition	$ 1,400,000,000
DISH | Subsequent Event | T-Mobile and Sprint | Prepaid Business | Transition Services Agreement
Business Acquisition [Line Items]
Transition period (up to)	3 years
DISH | Subsequent Event | T-Mobile and Sprint | Prepaid Business | Master Network Services Agreement
Business Acquisition [Line Items]
Transition period (up to)	7 years
DISH | Subsequent Event | T-Mobile and Sprint | Spectrum Licenses
Business Acquisition [Line Items]
Payments for asset acquisition	$ 3,600,000,000
Additional lease period	2 years
T-Mobile and Sprint | Subsequent Event | DISH | Decommissioned Towers and Retail Locations
Business Acquisition [Line Items]
Option period (up to)	5 years
Sprint
Business Acquisition [Line Items]
Exchange ratio			0.10256
Exchange ratio (in shares)			9.75
Fully-diluted shares of combined company held by public stockholders (percent)								30.90%
Required fees by acquirer upon consummation				0		0
Required reimbursement by acquiree upon termination, percentage		33.00%
Accrued required reimbursement by acquiree upon termination				0		0
Required reimbursement by acquirer upon termination, percentage		67.00%
Required reimbursement by acquirer upon termination		$ 162,000,000
Accrued required reimbursement by acquirer upon termination				0		0
Costs recognized associated with merger transaction				222,000,000	$ 41,000,000	335,000,000
Required payment resulting from failure to satisfy closing condition of business combination agreement (up to)			$ 600,000,000
Sprint | Senior Notes
Business Acquisition [Line Items]
Payments of consent fees		$ 14,000,000
Sprint | Secured Term Loan Facility
Business Acquisition [Line Items]
Financing commitment, amount				7,000,000,000		7,000,000,000
Sprint | Deutsche Telekom AG
Business Acquisition [Line Items]
Fully-diluted shares expected to be held immediately following merger (percent)								41.70%
Required fees by acquirer upon consummation				$ 0		$ 0
Sprint | SoftBank
Business Acquisition [Line Items]
Fully-diluted shares expected to be held immediately following merger (percent)								27.40%

Receivables and Allowance for_3

Receivables and Allowance for Credit Losses - EIP Receivables (Details) $ in Millions	6 Months Ended
	Jun. 30, 2019USD ($)classsegment	Dec. 31, 2018USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio segments | segment	2
Customer classes | class	2
EIP receivables, gross	$ 4,490	$ 4,534
Unamortized imputed discount	(335)	(330)
EIP receivables, net of unamortized imputed discount	4,155	4,204
Allowance for credit losses	(105)	(119)
Equipment installment plan receivables, net	4,050	4,085
Equipment installment plan receivables, net
Accounts, Notes, Loans and Financing Receivable [Line Items]
Equipment installment plan receivables, net	2,446	2,538
Equipment installment plan receivables due after one year, net
Accounts, Notes, Loans and Financing Receivable [Line Items]
Equipment installment plan receivables, net	$ 1,604	$ 1,547

Receivables and Allowance for_4

Receivables and Allowance for Credit Losses - Unamortized Imputed Discount and Allowance for Credit Losses (Details) - USD ($) $ in Millions	6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses and imputed discount, beginning of period	$ 516	$ 482	$ 482
Bad debt expense	144	128
Write-offs, net of recoveries	(164)	(160)
Change in imputed discount on short-term and long-term EIP receivables	89	102
Impact on the imputed discount from sales of EIP receivables	(84)	(98)
Allowance for credit losses and imputed discount, end of period	501	454	516
Accounts Receivable Allowance
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses and imputed discount, beginning of period	67	86	86
Bad debt expense	31	25
Write-offs, net of recoveries	(37)	(41)
Allowance for credit losses and imputed discount, end of period	$ 61	70	$ 67
EIP Receivables Allowance
Financing Receivable, Allowance for Credit Losses [Line Items]
Weighted average effective imputed interest rate	9.60%		10.00%
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses and imputed discount, beginning of period	$ 449	396	$ 396
Bad debt expense	113	103
Write-offs, net of recoveries	(127)	(119)
Change in imputed discount on short-term and long-term EIP receivables	89	102
Impact on the imputed discount from sales of EIP receivables	(84)	(98)
Allowance for credit losses and imputed discount, end of period	$ 440	$ 384	$ 449

Receivables and Allowance for_5

Receivables and Allowance for Credit Losses - Gross EIP Receivables by Credit Category (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Financing Receivable, Recorded Investment [Line Items]
EIP receivables, gross	$ 4,490	$ 4,534
Prime
Financing Receivable, Recorded Investment [Line Items]
EIP receivables, gross	2,249	2,015
Subprime
Financing Receivable, Recorded Investment [Line Items]
EIP receivables, gross	2,241	2,519
Current - 30 days past due
Financing Receivable, Recorded Investment [Line Items]
EIP receivables, gross	4,399	4,433
Current - 30 days past due | Prime
Financing Receivable, Recorded Investment [Line Items]
EIP receivables, gross	2,222	1,987
Current - 30 days past due | Subprime
Financing Receivable, Recorded Investment [Line Items]
EIP receivables, gross	2,177	2,446
31 - 60 days past due
Financing Receivable, Recorded Investment [Line Items]
EIP receivables, gross	44	47
31 - 60 days past due | Prime
Financing Receivable, Recorded Investment [Line Items]
EIP receivables, gross	14	15
31 - 60 days past due | Subprime
Financing Receivable, Recorded Investment [Line Items]
EIP receivables, gross	30	32
61 - 90 days past due
Financing Receivable, Recorded Investment [Line Items]
EIP receivables, gross	23	25
61 - 90 days past due | Prime
Financing Receivable, Recorded Investment [Line Items]
EIP receivables, gross	6	6
61 - 90 days past due | Subprime
Financing Receivable, Recorded Investment [Line Items]
EIP receivables, gross	17	19
More than 90 days past due
Financing Receivable, Recorded Investment [Line Items]
EIP receivables, gross	24	29
More than 90 days past due | Prime
Financing Receivable, Recorded Investment [Line Items]
EIP receivables, gross	7	7
More than 90 days past due | Subprime
Financing Receivable, Recorded Investment [Line Items]
EIP receivables, gross	$ 17	$ 22

Sales of Certain Receivables -

Sales of Certain Receivables - Sales of Service Receivables (Details) - USD ($)	Jun. 30, 2019	Jan. 01, 2019	Dec. 31, 2018	Dec. 31, 2014
Variable Interest Entity [Line Items]
Other current assets	$ 1,730,000,000	$ 1,598,000,000	$ 1,676,000,000
Accounts payable and accrued liabilities	7,260,000,000	7,676,000,000	7,741,000,000
Other current liabilities	1,564,000,000	$ 815,000,000	787,000,000
Factoring Arrangement | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Revolving receivables facility, maximum borrowing capacity				$ 950,000,000
Revolving receivables facility, outstanding borrowings	950,000,000		774,000,000
Other current assets	351,000,000		339,000,000
Accounts payable and accrued liabilities	0		59,000,000
Other current liabilities	$ 293,000,000		$ 149,000,000

Sales of Certain Receivables _2

Sales of Certain Receivables - Sales of EIP Receivables (Details) - USD ($)	Jun. 30, 2019	Jan. 01, 2019	Dec. 31, 2018	Dec. 31, 2015
Variable Interest Entity [Line Items]
Other current assets	$ 1,730,000,000	$ 1,598,000,000	$ 1,676,000,000
Other assets	1,707,000,000	$ 1,552,000,000	1,623,000,000
EIP Securitization Arrangement
Variable Interest Entity [Line Items]
Revolving receivables facility, maximum borrowing capacity				$ 1,300,000,000
Revolving receivables facility, outstanding borrowings	1,300,000,000		1,300,000,000
Other current assets	340,000,000		321,000,000
Other assets	74,000,000		88,000,000
Other long-term liabilities	$ 23,000,000		$ 22,000,000

Sales of Certain Receivables _3

Sales of Certain Receivables - Sales of Receivables and Continuing Involvement (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Jan. 01, 2019
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Other current assets	$ 1,730		$ 1,730		$ 1,676	$ 1,598
Other long-term assets	1,707		1,707		1,623	1,552
Accounts payable and accrued liabilities	7,260		7,260		7,741	7,676
Other current liabilities	1,564		1,564		787	815
Other long-term liabilities	913		913		967	$ 903
Of which:
Losses from sales of receivables	28	$ 27	63	$ 79
Factoring and EIP Securitization Arrangement | Variable Interest Entity, Primary Beneficiary
Of which:
Maximum exposure to loss, Factoring VIE	1,100		1,100
Factoring and EIP Securitization Arrangement
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Derecognized net service receivables and EIP receivables	2,616		2,616		2,577
Other current assets	691		691		660
Deferred purchase price assets	763		763		746
Other long-term assets	74		74		88
Accounts payable and accrued liabilities	0		0		59
Other current liabilities	293		293		149
Other long-term liabilities	23		23		22
Net cash proceeds since inception			1,956		1,879
Of which:
Change in net cash proceeds during the year-to-date period			77		(179)
Net cash proceeds funded by reinvested collections			1,879		2,058
Losses from sales of receivables	28	$ 27	63	$ 79
Factoring and EIP Securitization Arrangement | Other current assets - of which, deferred purchase price
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Deferred purchase price assets	689		689		658
Factoring and EIP Securitization Arrangement | Other long-term assets - of which, deferred purchase price
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Deferred purchase price assets	$ 74		$ 74		$ 88

Spectrum License Transactions -

Spectrum License Transactions - Schedule of Spectrum License Activity (Details) $ in Millions	1 Months Ended		3 Months Ended		6 Months Ended
	Jun. 30, 2019USD ($)license	Feb. 28, 2019USD ($)	Jun. 30, 2019USD ($)	Jun. 30, 2018USD ($)	Jun. 30, 2019USD ($)	Jun. 30, 2018USD ($)	Oct. 31, 2018USD ($)
Indefinite-lived Intangible Assets [Roll Forward]
Purchase of spectrum licenses			$ 665	$ 28	$ 850	$ 79
Licensing Agreements
Indefinite-lived Intangible Assets [Roll Forward]
Beginning balance					35,559
Spectrum license acquisitions					857
Indefinite-lived Intangible Assets, Written off Related to Sale of Business Unit					0
Costs to clear spectrum					14
Ending balance	$ 36,430		$ 36,430		$ 36,430
Number of licenses | license	2,211
Purchase of spectrum licenses	$ 842
Licensing Agreements | 28 GHz Auction
Indefinite-lived Intangible Assets [Roll Forward]
Purchase of spectrum licenses		$ 19
Asset purchase deposit							$ 20
Licensing Agreements | 24 GHz Auction
Indefinite-lived Intangible Assets [Roll Forward]
Purchase of spectrum licenses	$ 656
Asset purchase deposit		$ 147

Fair Value Measurements - Narra

Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions	Apr. 29, 2019	Jun. 30, 2019	Apr. 28, 2019	Dec. 31, 2018	Oct. 31, 2018
Derivative [Line Items]
Accumulated other comprehensive loss		$ (813)		$ (332)
Guarantee liabilities		71		73
EIP receivables, gross		4,490		4,534
Equipment installment plan receivables, net
Derivative [Line Items]
EIP receivables, gross		3,000
Affiliated Entity | 9.332% Senior Reset Notes to affiliates due 2023
Derivative [Line Items]
Principal Amount			$ 600
Interest rate, stated percentage			9.332%
Redemption price (as a percent)	104.666%
Interest Rate Contract | Cash Flow Hedging
Derivative [Line Items]
Aggregate notional amount					$ 9,600
Fair value of derivative instrument		$ 1,100		$ (447)

Fair Value Measurements - Fair

Fair Value Measurements - Fair Value of Short-term Investments and Long-term Debt (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Level 3 | Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deferred purchase price assets	$ 763	$ 746
Level 3 | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deferred purchase price assets	763	746
Level 1 | Carrying Amount | Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	10,954	10,950
Level 1 | Fair Value | Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	11,485	10,945
Level 2 | Carrying Amount | Secured Term Loan
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Term loans	4,000	4,000
Level 2 | Carrying Amount | Affiliated Entity
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	0	598
Level 2 | Carrying Amount | Senior Notes | Affiliated Entity
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	9,985	9,984
Level 2 | Fair Value | Secured Term Loan
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Term loans	4,000	3,976
Level 2 | Fair Value | Affiliated Entity
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	0	640
Level 2 | Fair Value | Senior Notes | Affiliated Entity
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	$ 10,344	$ 9,802

Tower Obligations - Narrative (

Tower Obligations - Narrative (Details) $ in Millions	Jan. 01, 2019tower_site	Jun. 30, 2019tower_site	Dec. 31, 2015USD ($)	Dec. 31, 2012USD ($)tower_site	Dec. 31, 2018
Minimum
Sale Leaseback Transaction [Line Items]
Lessee leasing arrangements, operating leases, term of contract		5 years			5 years
Maximum
Sale Leaseback Transaction [Line Items]
Lessee leasing arrangements, operating leases, term of contract		10 years			10 years
Tower Transaction
Sale Leaseback Transaction [Line Items]
Property subject to sale, number of units | tower_site				7,100
Net proceeds, financing activities | $				$ 2,500
Property subject to failed sale leaseback transaction, number of units | tower_site	6,200
Lessee leasing arrangements, operating leases, term of contract		10 years		10 years
Sale leaseback transaction, fixed-price purchase options | $				$ 2,000
Imputed interest rate, financial obligation				8.00%
Tower Transaction | Minimum
Sale Leaseback Transaction [Line Items]
Lessee leasing arrangements, operating leases, term of contract				23 years
Tower Transaction | Maximum
Sale Leaseback Transaction [Line Items]
Lessee leasing arrangements, operating leases, term of contract				37 years
Tower Transaction PTI
Sale Leaseback Transaction [Line Items]
Net proceeds, financing activities | $			$ 140
Property subject to failed sale leaseback transaction, number of units | tower_site		150
Imputed interest rate, financial obligation			5.00%

Tower Obligations - Sale Leaseb

Tower Obligations - Sale Leaseback Transaction (Details) - USD ($) $ in Millions	Jun. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Leases [Abstract]
Property and equipment, net	$ 224		$ 329
Tower obligations	$ 2,247	$ 2,212	$ 2,557

Tower Obligations - Future Mini

Tower Obligations - Future Minimum Payments (Details) $ in Millions	Jun. 30, 2019USD ($)
Leases [Abstract]
Tower obligation payments, due 2020	$ 157
Tower obligation payments, due 2021 and 2022	315
Tower obligations payments, due 2023 and 2024	315
Tower obligation payments due thereafter	$ 537

Revenue from Contracts with C_3

Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Revenues	$ 10,979	$ 10,571	$ 22,059	$ 21,026
Branded postpaid phone revenue
Disaggregation of Revenue [Line Items]
Revenues	5,287	4,892	10,470	9,703
Branded postpaid other revenue
Disaggregation of Revenue [Line Items]
Revenues	326	272	636	531
Branded postpaid revenues
Disaggregation of Revenue [Line Items]
Revenues	5,613	5,164	11,106	10,234
Lease of mobile communication devices and accessories
Disaggregation of Revenue [Line Items]
Revenues	$ 143	$ 177	$ 304	$ 348

Revenue from Contracts with C_4

Revenue from Contracts with Customers - Contract Balances (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Change in Contract with Customer, Asset and Liability [Abstract]
Contract assets included in other current assets	$ 42		$ 42		$ 51
Contract liabilities included in deferred revenue	571		571		$ 645
Change in contract assets included in other current assets			(9)
Change in contracts liabilities included in deferred revenue			(74)
Amounts included in the beginning of period contract liability balance	$ 43	$ 31	$ 603	$ 559

Revenue from Contracts with C_5

Revenue from Contracts with Customers - Remaining Performance Obligations, Branded Postpaid Contracts (Details) $ in Millions	6 Months Ended
	Jun. 30, 2019USD ($)
Branded postpaid contracts
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 234
Remaining contract duration	24 months
Minimum
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining contract duration	1 year
Maximum
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining contract duration	11 years

Revenue from Contracts with C_6

Revenue from Contracts with Customers - Remaining Performance Obligations (Details) $ in Millions	Jun. 30, 2019USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 652
Remaining performance obligation, expected timing of satisfaction, period	9 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 1,100
Remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 1,600
Remaining performance obligation, expected timing of satisfaction, period

Revenue from Contracts with C_7

Revenue from Contracts with Customers - Contract Costs (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Capitalized Contract Cost [Abstract]
Total deferred incremental costs to obtain contracts	$ 765,000,000		$ 765,000,000		$ 644,000,000
Average amortization period, deferred contract costs	24 months		24 months
Amortization of deferred costs	$ 137,000,000	$ 57,000,000	$ 253,000,000	$ 92,000,000
Impairment losses recognized on deferred contract cost assets	$ 0	$ 0	$ 0	$ 0

Earnings Per Share - Computatio

Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share [Abstract]
Net income	$ 939	$ 782	$ 1,847	$ 1,453
Weighted average shares outstanding - basic (in shares)	854,368,443	847,660,488	852,796,369	851,420,686
Effect of dilutive securities:
Outstanding stock options and unvested stock awards (in shares)	5,767,150	4,380,182	8,094,501	7,308,146
Weighted average shares outstanding - diluted (in shares)	860,135,593	852,040,670	860,890,870	858,728,832
Earnings per share - basic (in USD per share)	$ 1.10	$ 0.92	$ 2.16	$ 1.71
Earnings per share - diluted (in USD per share)	$ 1.09	$ 0.92	$ 2.14	$ 1.69
Outstanding stock options and unvested stock awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities (in shares)	67,856	797,948	39,342	487,133

Earnings Per Share - Narrative

Earnings Per Share - Narrative (Details) - Mandatory Convertible Preferred Stock Series A - $ / shares	Jun. 30, 2019	Jun. 30, 2018
Class of Stock [Line Items]
Preferred shares authorized (in shares)	100,000,000
Preferred stock, par value (in USD per share)	$ 0.00001
Preferred shares outstanding (in shares)	0	0

Leases - Narrative (Details)

Leases - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Lessee, Lease, Description [Line Items]
Interest payments for financing leases	$ 21		$ 41
Additional operating leases not yet commenced, payments due	$ 300		$ 300
Device upgrade period			18 months
Due in 2019					$ 2,700
Due in 2020 and 2021					4,700
Due in 2022 and 2023					3,300
Due thereafter					3,800
Rent expense under operating leases		$ 765		$ 1,500
Capital leased assets, gross					3,100
Capital leased assets, accumulated amortization					$ 867
Minimum
Lessee, Lease, Description [Line Items]
Lessee leasing arrangements, operating leases, term of contract	5 years		5 years		5 years
Option to extend lease term			P5Y
Lessee leasing arrangements, finance leases, term of contract	2 years		2 years
Maximum
Lessee, Lease, Description [Line Items]
Lessee leasing arrangements, operating leases, term of contract	10 years		10 years		10 years
Option to extend lease term			P35Y
Lessee leasing arrangements, finance leases, term of contract	5 years		5 years

Leases - Schedule of Lease Expe

Leases - Schedule of Lease Expense (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Leases [Abstract]
Operating lease expense	$ 634	$ 1,236
Financing lease expense:
Amortization of right-of-use assets	117	230
Interest on lease liabilities	20	40
Total financing lease expense	137	270
Variable lease expense	58	123
Total lease expense	$ 829	$ 1,629

Leases - Schedule of Informatio

Leases - Schedule of Information Related to Lease Term and Discount Rate (Details)	Jun. 30, 2019
Weighted Average Remaining Lease Term
Average remaining lease term for cell sites	6 years
Weighted Average Remaining Lease Term, Financing leases	3 years
Weighted Average Discount Rate
Weighted Average Discount Rate, Operating leases	5.20%
Weighted Average Discount Rate, Financing leases	3.90%

Leases - Schedule of Future Min

Leases - Schedule of Future Minimum Operating and Finance Lease Maturities (Details) - USD ($) $ in Millions	Jun. 30, 2019	Jan. 01, 2019
Operating Leases
2020	$ 2,403
2021	2,761
2022	2,503
2023	2,088
2024	1,449
Thereafter	3,543
Total lease payments	14,747
Less imputed interest	2,334
Total	12,413	$ 11,364
Finance Leases
2020	1,021
2021	713
2022	430
2023	126
2024	58
Thereafter	91
Total lease payments	2,439
Less imputed interest	162
Total	$ 2,277	$ 2,016

Leases - Leased Wireless Device

Leases - Leased Wireless Devices (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Leases [Abstract]
Leased wireless devices, gross	$ 988	$ 1,159
Accumulated depreciation	(570)	(622)
Leased wireless devices, net	$ 418	$ 537

Leases - Schedule of Future M_2

Leases - Schedule of Future Minimum Payments Expected to be Received (under 842) (Details) $ in Millions	Jun. 30, 2019USD ($)
Leases [Abstract]
2020	$ 318
2021	47
Total	$ 365

Leases - Schedule of Future M_3

Leases - Schedule of Future Minimum Payments Expected to be Received (under 840) (Details) $ in Millions	Dec. 31, 2018USD ($)
Leases [Abstract]
2019	$ 419
2020	59
Total	$ 478

Leases - Schedule of Future M_4

Leases - Schedule of Future Minimum Payments Required Under Capital Leases (Details) $ in Millions	Dec. 31, 2018USD ($)
Leases [Abstract]
2019	$ 909
2020	631
2021	389
2022	102
2023	66
Thereafter	106
Total	2,203
Interest	143
Maintenance	$ 45

Commitments and Contingencies -

Commitments and Contingencies - Narrative (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018	Oct. 31, 2018
Operating Leased Assets [Line Items]
Commitments due 2020	$ 147
Commitments due 2021 and 2022	242
Commitments due 2023 and 2024	160
Commitments due thereafter	188
Interest Rate Contract | Cash Flow Hedging
Operating Leased Assets [Line Items]
Aggregate notional amount			$ 9,600
Fair value of derivative instrument	1,100	$ (447)
Sprint
Operating Leased Assets [Line Items]
Total long-term lease commitment	$ 509

Guarantor Financial Informati_3

Guarantor Financial Information - Condensed Consolidating Balance Sheet Information (Details) - USD ($) $ in Millions	Jun. 30, 2019	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 1,105			$ 1,203
Accounts receivable, net	1,817			1,769
Equipment installment plan receivables, net	2,446			2,538
Accounts receivable from affiliates	18			11
Inventory	998			1,084
Other current assets	1,730		$ 1,598	1,676
Total current assets	8,114			8,281
Property and equipment, net	21,847		21,020	23,359
Operating lease right-of-use assets	10,439		9,251
Financing lease right-of-use assets	2,589		2,271
Goodwill	1,901			1,901
Spectrum licenses	36,430			35,559
Other intangible assets, net	157		186	198
Investments in subsidiaries, net	0			0
Intercompany receivables and note receivables	0			0
Equipment installment plan receivables due after one year, net	1,604			1,547
Other assets	1,707		1,552	1,623
Total assets	84,788			72,468
Current liabilities
Accounts payable and accrued liabilities	7,260		7,676	7,741
Payables to affiliates	198			200
Short-term debt	300			841
Deferred revenue	620			698
Short-term operating lease liabilities	2,268
Short-term financing lease liabilities	963
Other current liabilities	1,564		815	787
Total current liabilities	13,173			10,267
Long-term debt	10,954			12,124
Long-term debt to affiliates	13,985			14,582
Tower obligations	2,247		2,212	2,557
Deferred tax liabilities	5,090		4,703	4,472
Operating lease liabilities	10,145
Financing lease liabilities	1,314
Deferred rent expense			0	2,781
Negative carrying value of subsidiaries, net	0			0
Intercompany payables and debt	0			0
Other long-term liabilities	913		$ 903	967
Total long-term liabilities	44,648			37,483
Total stockholders' equity (deficit)	26,967	$ 26,181		24,718	$ 23,390	$ 22,876	$ 22,559
Total liabilities and stockholders' equity	84,788			72,468
Consolidating and Eliminating Adjustments
Current assets
Cash and cash equivalents	0			0
Accounts receivable, net	0			0
Equipment installment plan receivables, net	0			0
Accounts receivable from affiliates	0			0
Inventory	0			0
Other current assets	0			0
Total current assets	0			0
Property and equipment, net	0			0
Operating lease right-of-use assets	0
Financing lease right-of-use assets	0
Goodwill	0			0
Spectrum licenses	0			0
Other intangible assets, net	0			0
Investments in subsidiaries, net	(76,748)			(71,830)
Intercompany receivables and note receivables	(4,618)			(5,174)
Equipment installment plan receivables due after one year, net	0			0
Other assets	(164)			(145)
Total assets	(81,530)			(77,149)
Current liabilities
Accounts payable and accrued liabilities	0			0
Payables to affiliates	0			0
Short-term debt	0			0
Deferred revenue	0			0
Short-term operating lease liabilities	0
Short-term financing lease liabilities	0
Other current liabilities	0			0
Total current liabilities	0			0
Long-term debt	0			0
Long-term debt to affiliates	0			0
Tower obligations	0			0
Deferred tax liabilities	(164)			(145)
Operating lease liabilities	0
Financing lease liabilities	0
Deferred rent expense				0
Negative carrying value of subsidiaries, net	(815)			(676)
Intercompany payables and debt	(4,618)			(5,174)
Other long-term liabilities	0			0
Total long-term liabilities	(5,597)			(5,995)
Total stockholders' equity (deficit)	(75,933)			(71,154)
Total liabilities and stockholders' equity	(81,530)			(77,149)
Parent | Reportable Legal Entities
Current assets
Cash and cash equivalents	4			2
Accounts receivable, net	0			0
Equipment installment plan receivables, net	0			0
Accounts receivable from affiliates	0			0
Inventory	0			0
Other current assets	0			0
Total current assets	4			2
Property and equipment, net	0			0
Operating lease right-of-use assets	0
Financing lease right-of-use assets	0
Goodwill	0			0
Spectrum licenses	0			0
Other intangible assets, net	0			0
Investments in subsidiaries, net	27,332			25,314
Intercompany receivables and note receivables	0			0
Equipment installment plan receivables due after one year, net	0			0
Other assets	0			0
Total assets	27,336			25,316
Current liabilities
Accounts payable and accrued liabilities	0			0
Payables to affiliates	0			0
Short-term debt	0			0
Deferred revenue	0			0
Short-term operating lease liabilities	0
Short-term financing lease liabilities	0
Other current liabilities	0			0
Total current liabilities	0			0
Long-term debt	0			0
Long-term debt to affiliates	0			0
Tower obligations	0			0
Deferred tax liabilities	0			0
Operating lease liabilities	0
Financing lease liabilities	0
Deferred rent expense				0
Negative carrying value of subsidiaries, net	0			0
Intercompany payables and debt	369			598
Other long-term liabilities	0			0
Total long-term liabilities	369			598
Total stockholders' equity (deficit)	26,967			24,718
Total liabilities and stockholders' equity	27,336			25,316
Issuer | Reportable Legal Entities
Current assets
Cash and cash equivalents	2			1
Accounts receivable, net	0			0
Equipment installment plan receivables, net	0			0
Accounts receivable from affiliates	0			0
Inventory	0			0
Other current assets	0			0
Total current assets	2			1
Property and equipment, net	0			0
Operating lease right-of-use assets	0
Financing lease right-of-use assets	0
Goodwill	0			0
Spectrum licenses	0			0
Other intangible assets, net	0			0
Investments in subsidiaries, net	49,416			46,516
Intercompany receivables and note receivables	4,618			5,174
Equipment installment plan receivables due after one year, net	0			0
Other assets	8			7
Total assets	54,044			51,698
Current liabilities
Accounts payable and accrued liabilities	229			228
Payables to affiliates	147			157
Short-term debt	300			0
Deferred revenue	0			0
Short-term operating lease liabilities	0
Short-term financing lease liabilities	0
Other current liabilities	1,097			447
Total current liabilities	1,773			832
Long-term debt	10,954			10,950
Long-term debt to affiliates	13,985			14,582
Tower obligations	0			0
Deferred tax liabilities	0			0
Operating lease liabilities	0
Financing lease liabilities	0
Deferred rent expense				0
Negative carrying value of subsidiaries, net	0			0
Intercompany payables and debt	0			0
Other long-term liabilities	0			20
Total long-term liabilities	24,939			25,552
Total stockholders' equity (deficit)	27,332			25,314
Total liabilities and stockholders' equity	54,044			51,698
Guarantor Subsidiaries | Reportable Legal Entities
Current assets
Cash and cash equivalents	970			1,079
Accounts receivable, net	1,526			1,510
Equipment installment plan receivables, net	2,446			2,538
Accounts receivable from affiliates	18			11
Inventory	998			1,084
Other current assets	1,052			1,031
Total current assets	7,010			7,253
Property and equipment, net	21,535			23,062
Operating lease right-of-use assets	10,436
Financing lease right-of-use assets	2,589
Goodwill	1,683			1,683
Spectrum licenses	36,430			35,559
Other intangible assets, net	85			116
Investments in subsidiaries, net	0			0
Intercompany receivables and note receivables	0			0
Equipment installment plan receivables due after one year, net	1,604			1,547
Other assets	1,637			1,540
Total assets	83,009			70,760
Current liabilities
Accounts payable and accrued liabilities	6,736			7,240
Payables to affiliates	51			43
Short-term debt	0			841
Deferred revenue	619			698
Short-term operating lease liabilities	2,265
Short-term financing lease liabilities	963
Other current liabilities	154			164
Total current liabilities	10,788			8,986
Long-term debt	0			1,174
Long-term debt to affiliates	0			0
Tower obligations	76			384
Deferred tax liabilities	5,254			4,617
Operating lease liabilities	10,145
Financing lease liabilities	1,314
Deferred rent expense				2,781
Negative carrying value of subsidiaries, net	815			676
Intercompany payables and debt	3,872			4,234
Other long-term liabilities	890			926
Total long-term liabilities	22,366			14,792
Total stockholders' equity (deficit)	49,855			46,982
Total liabilities and stockholders' equity	83,009			70,760
Non-Guarantor Subsidiaries | Reportable Legal Entities
Current assets
Cash and cash equivalents	129			121
Accounts receivable, net	291			259
Equipment installment plan receivables, net	0			0
Accounts receivable from affiliates	0			0
Inventory	0			0
Other current assets	678			645
Total current assets	1,098			1,025
Property and equipment, net	312			297
Operating lease right-of-use assets	3
Financing lease right-of-use assets	0
Goodwill	218			218
Spectrum licenses	0			0
Other intangible assets, net	72			82
Investments in subsidiaries, net	0			0
Intercompany receivables and note receivables	0			0
Equipment installment plan receivables due after one year, net	0			0
Other assets	226			221
Total assets	1,929			1,843
Current liabilities
Accounts payable and accrued liabilities	295			273
Payables to affiliates	0			0
Short-term debt	0			0
Deferred revenue	1			0
Short-term operating lease liabilities	3
Short-term financing lease liabilities	0
Other current liabilities	313			176
Total current liabilities	612			449
Long-term debt	0			0
Long-term debt to affiliates	0			0
Tower obligations	2,171			2,173
Deferred tax liabilities	0			0
Operating lease liabilities	0
Financing lease liabilities	0
Deferred rent expense				0
Negative carrying value of subsidiaries, net	0			0
Intercompany payables and debt	377			342
Other long-term liabilities	23			21
Total long-term liabilities	2,571			2,536
Total stockholders' equity (deficit)	(1,254)			(1,142)
Total liabilities and stockholders' equity	$ 1,929			$ 1,843

Guarantor Financial Informati_4

Guarantor Financial Information - Condensed Consolidating Statement of Comprehensive Income Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenues
Revenues	$ 10,979	$ 10,571	$ 22,059	$ 21,026
Operating expenses
Selling, general and administrative	3,543	3,185	6,985	6,349
Depreciation and amortization	1,585	1,634	3,185	3,209
Total operating expense	9,438	9,121	19,042	18,294
Operating income	1,541	1,450	3,017	2,732
Other income (expense)
Interest expense	(182)	(196)	(361)	(447)
Interest expense to affiliates	(101)	(128)	(210)	(294)
Interest income	4	6	12	12
Other expense, net	(22)	(64)	(15)	(54)
Total other expense, net	(301)	(382)	(574)	(783)
Income before income taxes	1,240	1,068	2,443	1,949
Income tax expense	(301)	(286)	(596)	(496)
Earnings of subsidiaries	0	0	0	0
Net income	939	782	1,847	1,453
Net income	939	782	1,847	1,453
Other comprehensive income (loss), net of tax	(292)	3	(481)	0
Total comprehensive income	647	785	1,366	1,453
Service
Revenues
Revenues	8,426	7,931	16,703	15,737
Operating expenses
Cost of services and equipment sales	1,649	1,530	3,195	3,119
Product
Revenues
Revenues	2,263	2,325	4,779	4,678
Operating expenses
Cost of services and equipment sales	2,661	2,772	5,677	5,617
Other revenues
Revenues
Revenues	290	315	577	611
Consolidating and Eliminating Adjustments
Revenues
Revenues	(432)	(284)		(568)
Operating expenses
Selling, general and administrative	(345)	(238)	(673)	(467)
Depreciation and amortization	0	0	0	0
Total operating expense	(432)	(284)	(842)	(568)
Operating income	0	0	0	0
Other income (expense)
Interest expense	0	0	0	0
Interest expense to affiliates	5	5	10	10
Interest income	(5)	(5)	(10)	(10)
Other expense, net	0	0	0	0
Total other expense, net	0	0	0	0
Income before income taxes	0	0	0	0
Income tax expense	0	0	0	0
Earnings of subsidiaries	(2,115)	(1,893)	(4,141)	(3,594)
Net income	(2,115)	(1,893)	(4,141)	(3,594)
Net income	(2,115)	(1,893)	(4,141)	(3,594)
Other comprehensive income (loss), net of tax	189	(6)	313	0
Total comprehensive income	(1,926)	(1,899)	(3,828)	(3,594)
Consolidating and Eliminating Adjustments | Service
Revenues
Revenues	(333)	(229)	(647)	(450)
Operating expenses
Cost of services and equipment sales	(28)	0	(56)	0
Consolidating and Eliminating Adjustments | Product
Revenues
Revenues	(59)	(46)	(113)	(100)
Operating expenses
Cost of services and equipment sales	(59)	(46)	(113)	(101)
Consolidating and Eliminating Adjustments | Other revenues
Revenues
Revenues	(40)	(9)	(82)	(18)
Parent | Reportable Legal Entities
Revenues
Revenues	0	0		0
Operating expenses
Selling, general and administrative	0	0	0	0
Depreciation and amortization	0	0	0	0
Total operating expense	0	0	0	0
Operating income	0	0	0	0
Other income (expense)
Interest expense	0	0	0	0
Interest expense to affiliates	0	0	0	0
Interest income	0	0	0	0
Other expense, net	0	0	0	0
Total other expense, net	0	0	0	0
Income before income taxes	0	0	0	0
Income tax expense	0	0	0	0
Earnings of subsidiaries	939	782	1,847	1,453
Net income	939	782	1,847	1,453
Net income	939	782	1,847	1,453
Other comprehensive income (loss), net of tax	(292)	3	(481)	0
Total comprehensive income	647	785	1,366	1,453
Parent | Reportable Legal Entities | Service
Revenues
Revenues	0	0	0	0
Operating expenses
Cost of services and equipment sales	0	0	0	0
Parent | Reportable Legal Entities | Product
Revenues
Revenues	0	0	0	0
Operating expenses
Cost of services and equipment sales	0	0	0	0
Parent | Reportable Legal Entities | Other revenues
Revenues
Revenues	0	0	0	0
Issuer | Reportable Legal Entities
Revenues
Revenues	3	2		3
Operating expenses
Selling, general and administrative	0	6	1	6
Depreciation and amortization	0	0	0	0
Total operating expense	0	6	1	6
Operating income	3	(4)	8	(3)
Other income (expense)
Interest expense	(114)	(120)	(226)	(294)
Interest expense to affiliates	(102)	(129)	(211)	(295)
Interest income	5	6	10	12
Other expense, net	(19)	(59)	(11)	(91)
Total other expense, net	(230)	(302)	(438)	(668)
Income before income taxes	(227)	(306)	(430)	(671)
Income tax expense	0	0	0	0
Earnings of subsidiaries	1,166	1,088	2,277	2,124
Net income	939	782	1,847	1,453
Net income	939	782	1,847	1,453
Other comprehensive income (loss), net of tax	(292)	3	(481)	0
Total comprehensive income	647	785	1,366	1,453
Issuer | Reportable Legal Entities | Service
Revenues
Revenues	0	0	0	0
Operating expenses
Cost of services and equipment sales	0	0	0	0
Issuer | Reportable Legal Entities | Product
Revenues
Revenues	0	0	0	0
Operating expenses
Cost of services and equipment sales	0	0	0	0
Issuer | Reportable Legal Entities | Other revenues
Revenues
Revenues	3	2	9	3
Guarantor Subsidiaries | Reportable Legal Entities
Revenues
Revenues	10,588	10,246		20,389
Operating expenses
Selling, general and administrative	3,595	3,201	7,089	6,358
Depreciation and amortization	1,564	1,611	3,142	3,165
Total operating expense	9,245	8,890	18,683	17,845
Operating income	1,343	1,356	2,607	2,544
Other income (expense)
Interest expense	(21)	(28)	(41)	(57)
Interest expense to affiliates	(4)	(4)	(9)	(9)
Interest income	3	4	10	9
Other expense, net	(3)	(5)	(4)	37
Total other expense, net	(25)	(33)	(44)	(20)
Income before income taxes	1,318	1,323	2,563	2,524
Income tax expense	(270)	(277)	(531)	(476)
Earnings of subsidiaries	10	23	17	17
Net income	1,058	1,069	2,049	2,065
Net income	1,058	1,069	2,049	2,065
Other comprehensive income (loss), net of tax	103	3	168	0
Total comprehensive income	1,161	1,072	2,217	2,065
Guarantor Subsidiaries | Reportable Legal Entities | Service
Revenues
Revenues	7,992	7,609	15,851	15,096
Operating expenses
Cost of services and equipment sales	1,668	1,522	3,236	3,102
Guarantor Subsidiaries | Reportable Legal Entities | Product
Revenues
Revenues	2,320	2,370	4,890	4,777
Operating expenses
Cost of services and equipment sales	2,418	2,556	5,216	5,220
Guarantor Subsidiaries | Reportable Legal Entities | Other revenues
Revenues
Revenues	276	267	549	516
Non-Guarantor Subsidiaries | Reportable Legal Entities
Revenues
Revenues	820	607		1,202
Operating expenses
Selling, general and administrative	293	216	568	452
Depreciation and amortization	21	23	43	44
Total operating expense	625	509	1,200	1,011
Operating income	195	98	402	191
Other income (expense)
Interest expense	(47)	(48)	(94)	(96)
Interest expense to affiliates	0	0	0	0
Interest income	1	1	2	1
Other expense, net	0	0	0	0
Total other expense, net	(46)	(47)	(92)	(95)
Income before income taxes	149	51	310	96
Income tax expense	(31)	(9)	(65)	(20)
Earnings of subsidiaries	0	0	0	0
Net income	118	42	245	76
Net income	118	42	245	76
Other comprehensive income (loss), net of tax	0	0	0	0
Total comprehensive income	118	42	245	76
Non-Guarantor Subsidiaries | Reportable Legal Entities | Service
Revenues
Revenues	767	551	1,499	1,091
Operating expenses
Cost of services and equipment sales	9	8	15	17
Non-Guarantor Subsidiaries | Reportable Legal Entities | Product
Revenues
Revenues	2	1	2	1
Operating expenses
Cost of services and equipment sales	302	262	574	498
Non-Guarantor Subsidiaries | Reportable Legal Entities | Other revenues
Revenues
Revenues	$ 51	$ 55	$ 101	$ 110

Guarantor Financial Informati_5

Guarantor Financial Information - Condensed Consolidating Statement of Cash Flows Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Operating activities
Net cash provided by (used in) operating activities	$ 2,147	$ 1,261	$ 3,539	$ 2,031
Investing activities
Purchases of property and equipment	(1,789)	(1,629)	(3,720)	(2,995)
Purchases of spectrum licenses and other intangible assets, including deposits	(665)	(28)	(850)	(79)
Proceeds related to beneficial interests in securitization transactions	839	1,323	1,996	2,618
Acquisition of companies, net of cash acquired	0	(5)	0	(338)
Equity investment in subsidiary		0		0
Other, net	0	33	(7)	26
Net cash used in investing activities	(1,615)	(306)	(2,581)	(768)
Financing activities
Proceeds from issuance of long-term debt	0	0	0	2,494
Payments of consent fees related to long-term debt	0	(38)	0	(38)
Proceeds from borrowing on revolving credit facility	880	2,070	1,765	4,240
Repayments of revolving credit facility	(880)	(2,195)	(1,765)	(3,920)
Repayments of financing lease obligations	(229)	(155)	(315)	(327)
Repayments of long-term debt	(600)	(2,350)	(600)	(3,349)
Repurchases of common stock	0	(405)	0	(1,071)
Intercompany advances, net	0	0	0	0
Equity investment from parent		0		0
Tax withholdings on share-based awards	(4)	(10)	(104)	(84)
Cash payments for debt prepayment or debt extinguishment costs	(28)	(181)	(28)	(212)
Intercompany dividend paid	0	0	0	0
Other, net	(5)	(3)	(9)	0
Net cash used in financing activities	(866)	(3,267)	(1,056)	(2,267)
Change in cash and cash equivalents	(334)	(2,312)	(98)	(1,004)
Beginning of period	1,439	2,527	1,203	1,219
End of period	1,105	215	1,105	215
Consolidating and Eliminating Adjustments
Operating activities
Net cash provided by (used in) operating activities	(155)	(130)	(295)	(130)
Investing activities
Purchases of property and equipment	0	0	0	0
Purchases of spectrum licenses and other intangible assets, including deposits	0	0	0	0
Proceeds related to beneficial interests in securitization transactions	0	0	0	0
Acquisition of companies, net of cash acquired		0		0
Equity investment in subsidiary		26		26
Other, net		0	0	0
Net cash used in investing activities	0	26	0	26
Financing activities
Proceeds from issuance of long-term debt				0
Payments of consent fees related to long-term debt		0		0
Proceeds from borrowing on revolving credit facility	0	0	0	0
Repayments of revolving credit facility	0	0	0	0
Repayments of financing lease obligations	0	0	0	0
Repayments of long-term debt	0	0	0	0
Repurchases of common stock		0		0
Intercompany advances, net	0	0	0	0
Equity investment from parent		(26)		(26)
Tax withholdings on share-based awards	0	0	0	0
Cash payments for debt prepayment or debt extinguishment costs	0	0	0	0
Intercompany dividend paid	155	130	295	130
Other, net	0	0	0	0
Net cash used in financing activities	155	104	295	104
Change in cash and cash equivalents	0	0	0	0
Beginning of period	0	0	0	0
End of period	0	0	0	0
Parent | Reportable Legal Entities
Operating activities
Net cash provided by (used in) operating activities	0	(1)	0	0
Investing activities
Purchases of property and equipment	0	0	0	0
Purchases of spectrum licenses and other intangible assets, including deposits	0	0	0	0
Proceeds related to beneficial interests in securitization transactions	0	0	0	0
Acquisition of companies, net of cash acquired		0		0
Equity investment in subsidiary		0		0
Other, net		0	0	0
Net cash used in investing activities	0	0	0	0
Financing activities
Proceeds from issuance of long-term debt				0
Payments of consent fees related to long-term debt		0		0
Proceeds from borrowing on revolving credit facility	0	0	0	0
Repayments of revolving credit facility	0	0	0	0
Repayments of financing lease obligations	0	0	0	0
Repayments of long-term debt	0	0	0	0
Repurchases of common stock		(405)		(1,071)
Intercompany advances, net	0	405	0	995
Equity investment from parent		0		0
Tax withholdings on share-based awards	0	0	0	0
Cash payments for debt prepayment or debt extinguishment costs	0	0	0	0
Intercompany dividend paid	0	0	0	0
Other, net	1	1	2	3
Net cash used in financing activities	1	1	2	(73)
Change in cash and cash equivalents	1	0	2	(73)
Beginning of period	3	1	2	74
End of period	4	1	4	1
Issuer | Reportable Legal Entities
Operating activities
Net cash provided by (used in) operating activities	(124)	(258)	(372)	(662)
Investing activities
Purchases of property and equipment	0	0	0	0
Purchases of spectrum licenses and other intangible assets, including deposits	0	0	0	0
Proceeds related to beneficial interests in securitization transactions	0	0	0	0
Acquisition of companies, net of cash acquired		0		0
Equity investment in subsidiary		0		0
Other, net		0	0	0
Net cash used in investing activities	0	0	0	0
Financing activities
Proceeds from issuance of long-term debt				2,494
Payments of consent fees related to long-term debt		0		0
Proceeds from borrowing on revolving credit facility	880	2,070	1,765	4,240
Repayments of revolving credit facility	0	0	0	0
Repayments of financing lease obligations	0	0	0	0
Repayments of long-term debt	0	0	0	0
Repurchases of common stock		0		0
Intercompany advances, net	(756)	(1,810)	(1,392)	(6,070)
Equity investment from parent		0		0
Tax withholdings on share-based awards	0	0	0	0
Cash payments for debt prepayment or debt extinguishment costs	0	0	0	0
Intercompany dividend paid	0	0	0	0
Other, net	0	0	0	0
Net cash used in financing activities	124	260	373	664
Change in cash and cash equivalents	0	2	1	2
Beginning of period	2	1	1	1
End of period	2	3	2	3
Guarantor Subsidiaries | Reportable Legal Entities
Operating activities
Net cash provided by (used in) operating activities	3,112	2,932	5,909	5,306
Investing activities
Purchases of property and equipment	(1,740)	(1,624)	(3,666)	(2,990)
Purchases of spectrum licenses and other intangible assets, including deposits	(665)	(28)	(850)	(79)
Proceeds related to beneficial interests in securitization transactions	8	12	17	25
Acquisition of companies, net of cash acquired		(5)		(338)
Equity investment in subsidiary		(26)		(26)
Other, net		33	(7)	26
Net cash used in investing activities	(2,397)	(1,638)	(4,506)	(3,382)
Financing activities
Proceeds from issuance of long-term debt				0
Payments of consent fees related to long-term debt		(38)		(38)
Proceeds from borrowing on revolving credit facility	0	0	0	0
Repayments of revolving credit facility	(880)	(2,195)	(1,765)	(3,920)
Repayments of financing lease obligations	(229)	(154)	(314)	(326)
Repayments of long-term debt	(600)	(2,350)	(600)	(3,349)
Repurchases of common stock		0		0
Intercompany advances, net	688	1,406	1,310	5,085
Equity investment from parent		0		0
Tax withholdings on share-based awards	(4)	(10)	(104)	(84)
Cash payments for debt prepayment or debt extinguishment costs	(28)	(181)	(28)	(212)
Intercompany dividend paid	0	0	0	0
Other, net	(6)	(4)	(11)	(3)
Net cash used in financing activities	(1,059)	(3,526)	(1,512)	(2,847)
Change in cash and cash equivalents	(344)	(2,232)	(109)	(923)
Beginning of period	1,314	2,395	1,079	1,086
End of period	970	163	970	163
Non-Guarantor Subsidiaries | Reportable Legal Entities
Operating activities
Net cash provided by (used in) operating activities	(686)	(1,282)	(1,703)	(2,483)
Investing activities
Purchases of property and equipment	(49)	(5)	(54)	(5)
Purchases of spectrum licenses and other intangible assets, including deposits	0	0	0	0
Proceeds related to beneficial interests in securitization transactions	831	1,311	1,979	2,593
Acquisition of companies, net of cash acquired		0		0
Equity investment in subsidiary		0		0
Other, net		0	0	0
Net cash used in investing activities	782	1,306	1,925	2,588
Financing activities
Proceeds from issuance of long-term debt				0
Payments of consent fees related to long-term debt		0		0
Proceeds from borrowing on revolving credit facility	0	0	0	0
Repayments of revolving credit facility	0	0	0	0
Repayments of financing lease obligations	0	(1)	(1)	(1)
Repayments of long-term debt	0	0	0	0
Repurchases of common stock		0		0
Intercompany advances, net	68	(1)	82	(10)
Equity investment from parent		26		26
Tax withholdings on share-based awards	0	0	0	0
Cash payments for debt prepayment or debt extinguishment costs	0	0	0	0
Intercompany dividend paid	(155)	(130)	(295)	(130)
Other, net	0	0	0	0
Net cash used in financing activities	(87)	(106)	(214)	(115)
Change in cash and cash equivalents	9	(82)	8	(10)
Beginning of period	120	130	121	58
End of period	$ 129	$ 48	$ 129	$ 48