$TMUS
T-Mobile US, Inc. Stock $tmus

$tmus Overview Financials Valuation SEC Filings Company Website

2020 Q3 Form 10-Q Financial Statement

#000128369920000193 Filed on November 05, 2020

Income Statement

Concept	2020 Q3	2019 Q3	2019 Q2
Revenue	$19.27B	$11.06B	$10.98B
YoY Change	74.23%	2.05%	3.86%
Cost Of Revenue	$7.602B	$4.437B	$4.310B
YoY Change	71.33%	-0.25%	181.7%
Gross Profit	$11.67B	$6.624B	$6.669B
YoY Change	76.18%	3.65%	-26.24%
Gross Profit Margin	60.55%	59.89%	60.74%
Selling, General & Admin	$4.876B	$3.498B	$3.543B
YoY Change	39.39%	5.55%	11.24%
% of Gross Profit	41.78%	52.81%	53.13%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$4.150B	$1.655B	$1.585B
YoY Change	150.76%	1.1%	-3.0%
% of Gross Profit	35.56%	24.98%	23.77%
Operating Expenses	$4.876B	$3.498B	$3.543B
YoY Change	39.39%	5.55%	11.24%
Operating Profit	$2.565B	$1.471B	$1.541B
YoY Change	74.37%	2.15%	6.28%
Interest Expense	-$806.0M	$184.0M	$182.0M
YoY Change	-538.04%	-5.15%	-7.14%
% of Operating Profit	-31.42%	12.51%	11.81%
Other Income/Expense, Net	-$905.0M	-$276.0M	-$301.0M
YoY Change	227.9%	-10.97%	-21.2%
Pretax Income	$1.660B	$1.195B	$1.240B
YoY Change	38.91%	5.75%	16.1%
Income Tax	$407.0M	$325.0M	$301.0M
% Of Pretax Income	24.52%	27.2%	24.27%
Net Earnings	$1.253B	$870.0M	$939.0M
YoY Change	44.02%	9.43%	20.08%
Net Earnings / Revenue	6.5%	7.87%	8.55%
Basic Earnings Per Share	$1.01	$1.02	$1.10
Diluted Earnings Per Share	$1.00	$1.01	$1.09
COMMON SHARES
Basic Shares Outstanding	1.238B shares	854.6M shares	854.4M shares
Diluted Shares Outstanding	1.250B shares	862.7M shares	860.1M shares

Balance Sheet

Concept	2020 Q3	2019 Q3	2019 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments	$6.571B	$1.653B	$1.105B
YoY Change	297.52%	402.43%	413.95%
Cash & Equivalents	$6.571B	$1.653B	$1.105B
Short-Term Investments
Other Short-Term Assets	$2.889B	$1.737B	$1.730B
YoY Change	66.32%	-11.78%	-10.32%
Inventory	$1.931B	$801.0M	$998.0M
Prepaid Expenses	$659.0M
Receivables	$4.313B	$1.822B	$1.817B
Other Receivables	$3.102B	$2.445B	$2.464B
Total Short-Term Assets	$19.47B	$8.458B	$8.114B
YoY Change	130.14%	16.09%	14.43%
LONG-TERM ASSETS
Property, Plant & Equipment	$38.57B	$22.10B	$21.85B
YoY Change	74.53%	-1.8%	-2.36%
Goodwill	$10.91B	$1.930B	$1.901B
YoY Change	465.08%	1.53%	0.0%
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets	$2.519B	$1.799B	$1.707B
YoY Change	40.02%	20.9%	30.21%
Total Long-Term Assets	$173.0B	$77.65B	$76.67B
YoY Change	122.76%	23.46%	22.48%
TOTAL ASSETS
Total Short-Term Assets	$19.47B	$8.458B	$8.114B
Total Long-Term Assets	$173.0B	$77.65B	$76.67B
Total Assets	$192.4B	$86.11B	$84.79B
YoY Change	123.49%	22.69%	21.66%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$3.862B	$6.406B	$7.260B
YoY Change	-39.71%	-1.45%	8.59%
Accrued Expenses	$8.185B	$2.232B	$2.268B
YoY Change	266.71%
Deferred Revenue	$1.078B	$608.0M	$620.0M
YoY Change	77.3%	-12.64%	-14.13%
Short-Term Debt	$3.713B	$475.0M	$300.0M
YoY Change	681.68%	-39.34%	-77.34%
Long-Term Debt Due	$1.050B	$1.013B	$963.0M
YoY Change	3.65%
Total Short-Term Liabilities	$19.84B	$12.87B	$13.17B
YoY Change	54.17%	50.13%	41.94%
LONG-TERM LIABILITIES
Long-Term Debt	$58.35B	$10.96B	$10.95B
YoY Change	432.54%	-8.65%	-9.21%
Other Long-Term Liabilities	$3.577B	$936.0M	$913.0M
YoY Change	282.16%	-4.97%	-5.68%
Total Long-Term Liabilities	$108.1B	$45.47B	$44.65B
YoY Change	137.78%	22.05%	20.6%
TOTAL LIABILITIES
Total Short-Term Liabilities	$19.84B	$12.87B	$13.17B
Total Long-Term Liabilities	$108.1B	$45.47B	$44.65B
Total Liabilities	$128.0B	$58.34B	$57.82B
YoY Change	119.34%	27.3%	24.88%
SHAREHOLDERS EQUITY
Retained Earnings	-$6.586B	-$9.584B	-$10.45B
YoY Change	-31.28%	-29.5%	-27.35%
Common Stock	$72.71B	$38.43B	$38.24B
YoY Change	89.17%	1.26%	1.21%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$11.00M	$8.000M	$8.000M
YoY Change	37.5%	14.29%	14.29%
Treasury Stock Shares	1.545M shares	1.514M shares	1.518M shares
Shareholders Equity	$64.49B	$27.77B	$26.97B
YoY Change
Total Liabilities & Shareholders Equity	$192.4B	$86.11B	$84.79B
YoY Change	123.49%	22.69%	21.66%

Cashflow Statement

Concept	2020 Q3	2019 Q3	2019 Q2
OPERATING ACTIVITIES
Net Income	$1.253B	$870.0M	$939.0M
YoY Change	44.02%	9.43%	20.08%
Depreciation, Depletion And Amortization	$4.150B	$1.655B	$1.585B
YoY Change	150.76%	1.1%	-3.0%
Cash From Operating Activities	$2.772B	$1.748B	$2.147B
YoY Change	58.58%	91.25%	70.26%
INVESTING ACTIVITIES
Capital Expenditures	$3.217B	$1.514B	$1.789B
YoY Change	112.48%	11.16%	9.82%
Acquisitions	$0.00	$31.00M	$0.00
YoY Change	-100.0%		-100.0%
Other Investing Activities	$25.00M	-$1.000M	$0.00
YoY Change	-2600.0%	-75.0%	-100.0%
Cash From Investing Activities	-$1.132B	-$657.0M	-$1.615B
YoY Change	72.3%	1464.29%	427.78%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net	-$4.000M	$0.00	$0.00
YoY Change			-100.0%
Debt Paid & Issued, Net	$5.678B	$0.00	$600.0M
YoY Change			-74.47%
Cash From Financing Activities	-$6.144B	-$543.0M	-$866.0M
YoY Change	1031.49%	-28.36%	-73.49%
NET CHANGE
Cash From Operating Activities	$2.772B	$1.748B	$2.147B
Cash From Investing Activities	-$1.132B	-$657.0M	-$1.615B
Cash From Financing Activities	-$6.144B	-$543.0M	-$866.0M
Net Change In Cash	-$4.504B	$548.0M	-$334.0M
YoY Change	-921.9%	380.7%	-85.55%
FREE CASH FLOW
Cash From Operating Activities	$2.772B	$1.748B	$2.147B
Capital Expenditures	$3.217B	$1.514B	$1.789B
Free Cash Flow	-$445.0M	$234.0M	$358.0M
YoY Change	-290.17%	-152.23%	-197.28%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
	dei	Entity Central Index Key EntityCentralIndexKey	0001283699
	dei	Amendment Flag AmendmentFlag	false
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2020
	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q3
	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2020Q3	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P1Y
CY2020Q3	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P1Y
CY2020Q3	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1
	dei	Document Type DocumentType	10-Q
	dei	Document Quarterly Report DocumentQuarterlyReport	true
	dei	Document Period End Date DocumentPeriodEndDate	2020-09-30
	dei	Document Transition Report DocumentTransitionReport	false
	dei	Entity Shell Company EntityShellCompany	false
	dei	Entity File Number EntityFileNumber	1-33409
	dei	Entity Registrant Name EntityRegistrantName	T-MOBILE US, INC.
	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	20-0836269
	dei	Entity Address Address Line1 EntityAddressAddressLine1	12920 SE 38th Street
	dei	Entity Address City Or Town EntityAddressCityOrTown	Bellevue
	dei	Entity Address State Or Province EntityAddressStateOrProvince	WA
	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	98006-1350
	dei	City Area Code CityAreaCode	(425)
	dei	Local Phone Number LocalPhoneNumber	378-4000
	dei	Security12b Title Security12bTitle	Common Stock, par value $0.00001 per share
	dei	Trading Symbol TradingSymbol	TMUS
	dei	Security Exchange Name SecurityExchangeName	NASDAQ
	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
	dei	Entity Small Business EntitySmallBusiness	false
	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2020Q4	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	1241186776	shares
CY2020Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	6571000000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1528000000	USD
CY2020Q3	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	208000000	USD
CY2019Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	61000000	USD
CY2020Q3	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	4313000000	USD
CY2019Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	1888000000	USD
CY2020Q3	tmus	Financing Receivable Allowance For Credit Loss And Imputed Discount Current FinancingReceivableAllowanceForCreditLossAndImputedDiscountCurrent	450000000	USD
CY2019Q4	tmus	Financing Receivable Allowance For Credit Loss And Imputed Discount Current FinancingReceivableAllowanceForCreditLossAndImputedDiscountCurrent	333000000	USD
CY2020Q3	us-gaap	Notes And Loans Receivable Net Current NotesAndLoansReceivableNetCurrent	3083000000	USD
CY2019Q4	us-gaap	Notes And Loans Receivable Net Current NotesAndLoansReceivableNetCurrent	2600000000	USD
CY2020Q3	us-gaap	Due From Affiliate Current DueFromAffiliateCurrent	19000000	USD
CY2019Q4	us-gaap	Due From Affiliate Current DueFromAffiliateCurrent	20000000	USD
CY2020Q3	us-gaap	Inventory Net InventoryNet	1931000000	USD
CY2019Q4	us-gaap	Inventory Net InventoryNet	964000000	USD
CY2020Q3	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	659000000	USD
CY2019Q4	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	333000000	USD
CY2020Q3	us-gaap	Other Assets Current OtherAssetsCurrent	2889000000	USD
CY2019Q4	us-gaap	Other Assets Current OtherAssetsCurrent	1972000000	USD
CY2020Q3	us-gaap	Assets Current AssetsCurrent	19465000000	USD
CY2019Q4	us-gaap	Assets Current AssetsCurrent	9305000000	USD
CY2020Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	38567000000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	21984000000	USD
CY2020Q3	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	27999000000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	10933000000	USD
CY2020Q3	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	3038000000	USD
CY2019Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	2715000000	USD
CY2020Q3	us-gaap	Goodwill Goodwill	10906000000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	1930000000	USD
CY2020Q3	us-gaap	Indefinite Lived License Agreements IndefiniteLivedLicenseAgreements	82891000000	USD
CY2019Q4	us-gaap	Indefinite Lived License Agreements IndefiniteLivedLicenseAgreements	36465000000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	5660000000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	115000000	USD
CY2020Q3	tmus	Financing Receivable Allowance For Credit Loss And Imputed Discount Noncurrent FinancingReceivableAllowanceForCreditLossAndImputedDiscountNoncurrent	87000000	USD
CY2019Q4	tmus	Financing Receivable Allowance For Credit Loss And Imputed Discount Noncurrent FinancingReceivableAllowanceForCreditLossAndImputedDiscountNoncurrent	66000000	USD
CY2020Q3	us-gaap	Notes And Loans Receivable Net Noncurrent NotesAndLoansReceivableNetNoncurrent	1398000000	USD
CY2019Q4	us-gaap	Notes And Loans Receivable Net Noncurrent NotesAndLoansReceivableNetNoncurrent	1583000000	USD
CY2020Q3	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	2519000000	USD
CY2019Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	1891000000	USD
CY2020Q3	us-gaap	Assets Assets	192443000000	USD
CY2019Q4	us-gaap	Assets Assets	86921000000	USD
CY2020Q3	us-gaap	Accounts Payable And Accrued Liabilities Current AccountsPayableAndAccruedLiabilitiesCurrent	8389000000	USD
CY2019Q4	us-gaap	Accounts Payable And Accrued Liabilities Current AccountsPayableAndAccruedLiabilitiesCurrent	6746000000	USD
CY2020Q3	us-gaap	Accounts Payable Related Parties Current AccountsPayableRelatedPartiesCurrent	135000000	USD
CY2019Q4	us-gaap	Accounts Payable Related Parties Current AccountsPayableRelatedPartiesCurrent	187000000	USD
CY2020Q3	us-gaap	Short Term Borrowings ShortTermBorrowings	3713000000	USD
CY2019Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	25000000	USD
CY2020Q3	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	1078000000	USD
CY2019Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	631000000	USD
CY2020Q3	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	3658000000	USD
CY2019Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	2287000000	USD
CY2020Q3	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	1050000000	USD
CY2019Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	957000000	USD
CY2020Q3	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	1817000000	USD
CY2019Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	1673000000	USD
CY2020Q3	us-gaap	Liabilities Current LiabilitiesCurrent	19840000000	USD
CY2019Q4	us-gaap	Liabilities Current LiabilitiesCurrent	12506000000	USD
CY2020Q3	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	58345000000	USD
CY2019Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	10958000000	USD
CY2020Q3	us-gaap	Due To Affiliate Noncurrent DueToAffiliateNoncurrent	4711000000	USD
CY2019Q4	us-gaap	Due To Affiliate Noncurrent DueToAffiliateNoncurrent	13986000000	USD
CY2020Q3	tmus	Sale Leaseback Transaction Tower Obligation SaleLeasebackTransactionTowerObligation	3079000000	USD
CY2019Q4	tmus	Sale Leaseback Transaction Tower Obligation SaleLeasebackTransactionTowerObligation	2236000000	USD
CY2020Q3	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	10373000000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	5607000000	USD
CY2020Q3	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	26658000000	USD
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	10539000000	USD
CY2020Q3	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	1373000000	USD
CY2019Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	1346000000	USD
CY2020Q3	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	3577000000	USD
CY2019Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	954000000	USD
CY2020Q3	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	108116000000	USD
CY2019Q4	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	45626000000	USD
CY2020Q3	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2019Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2020Q3	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.00001
CY2019Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.00001
CY2020Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	2000000000	shares
CY2019Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	2000000000	shares
CY2020Q3	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	1242003310	shares
CY2019Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	858418615	shares
CY2020Q3	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	1240458618	shares
CY2019Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	856905400	shares
CY2020Q3	us-gaap	Common Stock Value CommonStockValue	0	USD
CY2019Q4	us-gaap	Common Stock Value CommonStockValue	0	USD
CY2020Q3	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	72705000000	USD
CY2019Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	38498000000	USD
CY2020Q3	us-gaap	Treasury Stock Shares TreasuryStockShares	1544692	shares
CY2019Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	1513215	shares
CY2020Q3	us-gaap	Treasury Stock Value TreasuryStockValue	11000000	USD
CY2019Q4	us-gaap	Treasury Stock Value TreasuryStockValue	8000000	USD
CY2020Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-1621000000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-868000000	USD
CY2020Q3	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-6586000000	USD
CY2019Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-8833000000	USD
CY2020Q3	us-gaap	Stockholders Equity StockholdersEquity	64487000000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	28789000000	USD
CY2020Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	192443000000	USD
CY2019Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	86921000000	USD
CY2020Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	19272000000	USD
CY2019Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	11061000000	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	48056000000	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	33120000000	USD
CY2020Q3	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	4876000000	USD
CY2019Q3	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	3498000000	USD
	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	14168000000	USD
	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	10483000000	USD
CY2020Q3	us-gaap	Asset Impairment Charges AssetImpairmentCharges	0	USD
CY2019Q3	us-gaap	Asset Impairment Charges AssetImpairmentCharges	0	USD
	us-gaap	Asset Impairment Charges AssetImpairmentCharges	418000000	USD
	us-gaap	Asset Impairment Charges AssetImpairmentCharges	0	USD
CY2020Q3	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	4150000000	USD
CY2019Q3	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	1655000000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	9932000000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	4840000000	USD
CY2020Q3	us-gaap	Costs And Expenses CostsAndExpenses	16707000000	USD
CY2019Q3	us-gaap	Costs And Expenses CostsAndExpenses	9590000000	USD
	us-gaap	Costs And Expenses CostsAndExpenses	43132000000	USD
	us-gaap	Costs And Expenses CostsAndExpenses	28632000000	USD
CY2020Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	2565000000	USD
CY2019Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	1471000000	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	4924000000	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	4488000000	USD
CY2020Q3	us-gaap	Interest Expense Debt InterestExpenseDebt	765000000	USD
CY2019Q3	us-gaap	Interest Expense Debt InterestExpenseDebt	184000000	USD
	us-gaap	Interest Expense Debt InterestExpenseDebt	1726000000	USD
	us-gaap	Interest Expense Debt InterestExpenseDebt	545000000	USD
CY2020Q3	us-gaap	Interest Expense Related Party InterestExpenseRelatedParty	44000000	USD
CY2019Q3	us-gaap	Interest Expense Related Party InterestExpenseRelatedParty	100000000	USD
	us-gaap	Interest Expense Related Party InterestExpenseRelatedParty	206000000	USD
	us-gaap	Interest Expense Related Party InterestExpenseRelatedParty	310000000	USD
CY2020Q3	us-gaap	Interest Income Other InterestIncomeOther	3000000	USD
CY2019Q3	us-gaap	Interest Income Other InterestIncomeOther	5000000	USD
	us-gaap	Interest Income Other InterestIncomeOther	21000000	USD
	us-gaap	Interest Income Other InterestIncomeOther	17000000	USD
CY2020Q3	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-99000000	USD
CY2019Q3	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	3000000	USD
	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-304000000	USD
	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-12000000	USD
CY2020Q3	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-905000000	USD
CY2019Q3	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-276000000	USD
	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-2215000000	USD
	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-850000000	USD
CY2020Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	1660000000	USD
CY2019Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	1195000000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	2709000000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	3638000000	USD
CY2020Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	407000000	USD
CY2019Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	325000000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	715000000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	921000000	USD
CY2020Q3	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	1253000000	USD
CY2019Q3	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	870000000	USD
	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	1994000000	USD
	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	2717000000	USD
CY2020Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	0	USD
CY2019Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	0	USD
	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	320000000	USD
	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	0	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	1253000000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	870000000	USD
	us-gaap	Net Income Loss NetIncomeLoss	2314000000	USD
	us-gaap	Net Income Loss NetIncomeLoss	2717000000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	1253000000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	870000000	USD
	us-gaap	Net Income Loss NetIncomeLoss	2314000000	USD
	us-gaap	Net Income Loss NetIncomeLoss	2717000000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTaxParent	12000000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTaxParent	-88000000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTaxParent	-261000000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTaxParent	-256000000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	33000000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	-257000000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	-757000000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	-738000000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	1000000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	0	USD
	us-gaap	Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	1000000	USD
	us-gaap	Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	0	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	4000000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	0	USD
	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	4000000	USD
	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	0	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	37000000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-257000000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-753000000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-738000000	USD
CY2020Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	1290000000	USD
CY2019Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	613000000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	1561000000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	1979000000	USD
CY2020Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.01
CY2019Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.02
	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.79
	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	3.18
CY2020Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0
CY2019Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0
	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.29
	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0
CY2020Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.01
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.02
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.08
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.18
CY2020Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.00
CY2019Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.01
	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.78
	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	3.15
CY2020Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0
CY2019Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0
	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.28
	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0
CY2020Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.00
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.01
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.06
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.15
CY2020Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	1238450665	shares
CY2019Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	854578241	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	1111511964	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	853391370	shares
CY2020Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	1249798740	shares
CY2019Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	862690751	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	1122040528	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	862854654	shares
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	1253000000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	870000000	USD
	us-gaap	Net Income Loss NetIncomeLoss	2314000000	USD
	us-gaap	Net Income Loss NetIncomeLoss	2717000000	USD
CY2020Q3	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	4150000000	USD
CY2019Q3	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	1655000000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	9932000000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	4840000000	USD
CY2020Q3	us-gaap	Share Based Compensation ShareBasedCompensation	161000000	USD
CY2019Q3	us-gaap	Share Based Compensation ShareBasedCompensation	126000000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	558000000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	366000000	USD
CY2020Q3	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	335000000	USD
CY2019Q3	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	294000000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	743000000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	849000000	USD
CY2020Q3	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	143000000	USD
CY2019Q3	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	74000000	USD
	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	489000000	USD
	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	218000000	USD
CY2020Q3	us-gaap	Securitization Financial Asset For Which Transfer Is Accounted As Sale Gain Loss On Sale SecuritizationFinancialAssetForWhichTransferIsAccountedAsSaleGainLossOnSale	18000000	USD
CY2019Q3	us-gaap	Securitization Financial Asset For Which Transfer Is Accounted As Sale Gain Loss On Sale SecuritizationFinancialAssetForWhichTransferIsAccountedAsSaleGainLossOnSale	-28000000	USD
	us-gaap	Securitization Financial Asset For Which Transfer Is Accounted As Sale Gain Loss On Sale SecuritizationFinancialAssetForWhichTransferIsAccountedAsSaleGainLossOnSale	-37000000	USD
	us-gaap	Securitization Financial Asset For Which Transfer Is Accounted As Sale Gain Loss On Sale SecuritizationFinancialAssetForWhichTransferIsAccountedAsSaleGainLossOnSale	-91000000	USD
CY2020Q3	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-108000000	USD
CY2019Q3	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-271000000	USD
	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-19000000	USD
CY2020Q3	us-gaap	Asset Impairment Charges AssetImpairmentCharges	0	USD
CY2019Q3	us-gaap	Asset Impairment Charges AssetImpairmentCharges	0	USD
	us-gaap	Asset Impairment Charges AssetImpairmentCharges	418000000	USD
	us-gaap	Asset Impairment Charges AssetImpairmentCharges	0	USD
CY2020Q3	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	1538000000	USD
CY2019Q3	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	745000000	USD
	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	2784000000	USD
	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	2693000000	USD
CY2020Q3	us-gaap	Increase Decrease In Finance Receivables IncreaseDecreaseInFinanceReceivables	306000000	USD
CY2019Q3	us-gaap	Increase Decrease In Finance Receivables IncreaseDecreaseInFinanceReceivables	78000000	USD
	us-gaap	Increase Decrease In Finance Receivables IncreaseDecreaseInFinanceReceivables	110000000	USD
	us-gaap	Increase Decrease In Finance Receivables IncreaseDecreaseInFinanceReceivables	478000000	USD
CY2020Q3	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	549000000	USD
CY2019Q3	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	36000000	USD
	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	1613000000	USD
	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	139000000	USD
CY2020Q3	tmus	Increase Decreasein Operating Lease Rightof Use Asset IncreaseDecreaseinOperatingLeaseRightofUseAsset	-1062000000	USD
CY2019Q3	tmus	Increase Decreasein Operating Lease Rightof Use Asset IncreaseDecreaseinOperatingLeaseRightofUseAsset	-491000000	USD
	tmus	Increase Decreasein Operating Lease Rightof Use Asset IncreaseDecreaseinOperatingLeaseRightofUseAsset	-2526000000	USD
	tmus	Increase Decreasein Operating Lease Rightof Use Asset IncreaseDecreaseinOperatingLeaseRightofUseAsset	-1395000000	USD
CY2020Q3	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	8000000	USD
CY2019Q3	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	118000000	USD
	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	106000000	USD
	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	288000000	USD
CY2020Q3	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-964000000	USD
CY2019Q3	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-395000000	USD
	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-2630000000	USD
	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-339000000	USD
CY2020Q3	tmus	Increase Decreasein Operating Lease Liability IncreaseDecreaseinOperatingLeaseLiability	-1145000000	USD
CY2019Q3	tmus	Increase Decreasein Operating Lease Liability IncreaseDecreaseinOperatingLeaseLiability	-549000000	USD
	tmus	Increase Decreasein Operating Lease Liability IncreaseDecreaseinOperatingLeaseLiability	-2947000000	USD
	tmus	Increase Decreasein Operating Lease Liability IncreaseDecreaseinOperatingLeaseLiability	-1592000000	USD
CY2020Q3	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-51000000	USD
CY2019Q3	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	42000000	USD
	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-2162000000	USD
	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	136000000	USD
CY2020Q3	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	139000000	USD
CY2019Q3	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	89000000	USD
	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	230000000	USD
	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	185000000	USD
CY2020Q3	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	2772000000	USD
CY2019Q3	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1748000000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	5166000000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	5287000000	USD
CY2020Q3	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	108000000	USD
CY2019Q3	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	118000000	USD
	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	339000000	USD
	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	361000000	USD
CY2020Q3	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	3217000000	USD
CY2019Q3	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	1514000000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	7227000000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	5234000000	USD
CY2020Q3	us-gaap	Proceeds From Sale Of Intangible Assets ProceedsFromSaleOfIntangibleAssets	17000000	USD
CY2019Q3	us-gaap	Payments To Acquire Intangible Assets PaymentsToAcquireIntangibleAssets	13000000	USD
	us-gaap	Payments To Acquire Intangible Assets PaymentsToAcquireIntangibleAssets	827000000	USD
	us-gaap	Payments To Acquire Intangible Assets PaymentsToAcquireIntangibleAssets	863000000	USD
CY2020Q3	us-gaap	Proceeds From Collection Of Retained Interest In Securitized Receivables ProceedsFromCollectionOfRetainedInterestInSecuritizedReceivables	855000000	USD
CY2019Q3	us-gaap	Proceeds From Collection Of Retained Interest In Securitized Receivables ProceedsFromCollectionOfRetainedInterestInSecuritizedReceivables	900000000	USD
	us-gaap	Proceeds From Collection Of Retained Interest In Securitized Receivables ProceedsFromCollectionOfRetainedInterestInSecuritizedReceivables	2325000000	USD
	us-gaap	Proceeds From Collection Of Retained Interest In Securitized Receivables ProceedsFromCollectionOfRetainedInterestInSecuritizedReceivables	2896000000	USD
CY2020Q3	us-gaap	Proceeds From Hedge Investing Activities ProceedsFromHedgeInvestingActivities	0	USD
CY2019Q3	us-gaap	Proceeds From Hedge Investing Activities ProceedsFromHedgeInvestingActivities	0	USD
	us-gaap	Proceeds From Hedge Investing Activities ProceedsFromHedgeInvestingActivities	632000000	USD
	us-gaap	Proceeds From Hedge Investing Activities ProceedsFromHedgeInvestingActivities	0	USD
CY2020Q3	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	0	USD
CY2019Q3	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	31000000	USD
	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	5000000000	USD
	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	31000000	USD
CY2020Q3	us-gaap	Proceeds From Divestiture Of Businesses Net Of Cash Divested ProceedsFromDivestitureOfBusinessesNetOfCashDivested	1238000000	USD
CY2019Q3	us-gaap	Proceeds From Divestiture Of Businesses Net Of Cash Divested ProceedsFromDivestitureOfBusinessesNetOfCashDivested	0	USD
	us-gaap	Proceeds From Divestiture Of Businesses Net Of Cash Divested ProceedsFromDivestitureOfBusinessesNetOfCashDivested	1238000000	USD
	us-gaap	Proceeds From Divestiture Of Businesses Net Of Cash Divested ProceedsFromDivestitureOfBusinessesNetOfCashDivested	0	USD
CY2020Q3	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	25000000	USD
CY2019Q3	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-1000000	USD
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	209000000	USD
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	6000000	USD
CY2020Q3	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1132000000	USD
CY2019Q3	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-657000000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-9068000000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-3238000000	USD
CY2020Q3	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	0	USD
CY2019Q3	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	0	USD
	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	26694000000	USD
	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	0	USD
CY2020Q3	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	0	USD
CY2019Q3	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	0	USD
	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	109000000	USD
	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	0	USD
CY2020Q3	us-gaap	Proceeds From Secured Lines Of Credit ProceedsFromSecuredLinesOfCredit	0	USD
CY2019Q3	us-gaap	Proceeds From Secured Lines Of Credit ProceedsFromSecuredLinesOfCredit	575000000	USD
	us-gaap	Proceeds From Secured Lines Of Credit ProceedsFromSecuredLinesOfCredit	0	USD
	us-gaap	Proceeds From Secured Lines Of Credit ProceedsFromSecuredLinesOfCredit	2340000000	USD
CY2020Q3	tmus	Repayments Of Revolving Credit Facility RepaymentsOfRevolvingCreditFacility	0	USD
CY2019Q3	tmus	Repayments Of Revolving Credit Facility RepaymentsOfRevolvingCreditFacility	575000000	USD
	tmus	Repayments Of Revolving Credit Facility RepaymentsOfRevolvingCreditFacility	0	USD
	tmus	Repayments Of Revolving Credit Facility RepaymentsOfRevolvingCreditFacility	2340000000	USD
CY2020Q3	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	246000000	USD
CY2019Q3	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	235000000	USD
	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	764000000	USD
	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	550000000	USD
CY2020Q3	tmus	Repayments Of Short Term Debt For Purchases Of Inventory Property And Equipment Net RepaymentsOfShortTermDebtForPurchasesOfInventoryPropertyAndEquipmentNet	231000000	USD
CY2019Q3	tmus	Repayments Of Short Term Debt For Purchases Of Inventory Property And Equipment Net RepaymentsOfShortTermDebtForPurchasesOfInventoryPropertyAndEquipmentNet	300000000	USD
	tmus	Repayments Of Short Term Debt For Purchases Of Inventory Property And Equipment Net RepaymentsOfShortTermDebtForPurchasesOfInventoryPropertyAndEquipmentNet	407000000	USD
	tmus	Repayments Of Short Term Debt For Purchases Of Inventory Property And Equipment Net RepaymentsOfShortTermDebtForPurchasesOfInventoryPropertyAndEquipmentNet	300000000	USD
CY2020Q3	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	5678000000	USD
CY2019Q3	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	0	USD
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	16207000000	USD
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	600000000	USD
CY2020Q3	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	2550000000	USD
CY2019Q3	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	0	USD
	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	19840000000	USD
	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	0	USD
CY2020Q3	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	2546000000	USD
CY2019Q3	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	0	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	19536000000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	19536000000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	0	USD
CY2020Q3	us-gaap	Proceeds From Short Term Debt ProceedsFromShortTermDebt	0	USD
CY2019Q3	us-gaap	Proceeds From Short Term Debt ProceedsFromShortTermDebt	0	USD
	us-gaap	Proceeds From Short Term Debt ProceedsFromShortTermDebt	18743000000	USD
	us-gaap	Proceeds From Short Term Debt ProceedsFromShortTermDebt	0	USD
CY2020Q3	us-gaap	Repayments Of Short Term Debt RepaymentsOfShortTermDebt	0	USD
CY2019Q3	us-gaap	Repayments Of Short Term Debt RepaymentsOfShortTermDebt	0	USD
	us-gaap	Repayments Of Short Term Debt RepaymentsOfShortTermDebt	18929000000	USD
	us-gaap	Repayments Of Short Term Debt RepaymentsOfShortTermDebt	0	USD
CY2020Q3	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	72000000	USD
CY2019Q3	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	4000000	USD
	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	351000000	USD
	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	108000000	USD
CY2020Q3	us-gaap	Payments Of Debt Extinguishment Costs PaymentsOfDebtExtinguishmentCosts	58000000	USD
CY2019Q3	us-gaap	Payments Of Debt Extinguishment Costs PaymentsOfDebtExtinguishmentCosts	0	USD
	us-gaap	Payments Of Debt Extinguishment Costs PaymentsOfDebtExtinguishmentCosts	82000000	USD
	us-gaap	Payments Of Debt Extinguishment Costs PaymentsOfDebtExtinguishmentCosts	28000000	USD
CY2020Q3	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	137000000	USD
CY2019Q3	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-4000000	USD
	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	139000000	USD
	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-13000000	USD
CY2020Q3	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-6144000000	USD
CY2019Q3	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-543000000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	9031000000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-1599000000	USD
CY2020Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-4504000000	USD
CY2019Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	548000000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	5129000000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	450000000	USD
CY2020Q2	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	11161000000	USD
CY2019Q2	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1105000000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1528000000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1203000000	USD
CY2020Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	6657000000	USD
CY2019Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1653000000	USD
CY2020Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	6657000000	USD
CY2019Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1653000000	USD
CY2020Q2	us-gaap	Stockholders Equity StockholdersEquity	62996000000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	1253000000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	37000000	USD
CY2020Q3	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	177000000	USD
CY2020Q3	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	27000000	USD
CY2020Q3	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	65000000	USD
CY2020Q3	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	72000000	USD
CY2020Q3	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	2550000000	USD
CY2020Q3	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	24750000	shares
CY2020Q3	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	2546000000	USD
CY2020Q3	us-gaap	Stockholders Equity StockholdersEquity	64487000000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	28789000000	USD
	us-gaap	Net Income Loss NetIncomeLoss	2314000000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-753000000	USD
	tmus	Adjustments To Additional Paid In Capital Executive Put Option AdjustmentsToAdditionalPaidInCapitalExecutivePutOption	1000000	USD
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	601000000	USD
	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	42000000	USD
	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	148000000	USD
	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	351000000	USD
	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	19766000000	USD
	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	198314426	shares
	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	19536000000	USD
	tmus	Adjustment To Additional Paid In Capital Purchase Price Consideration AdjustmentToAdditionalPaidInCapitalPurchasePriceConsideration	33533000000	USD
	tmus	Prior Year Retained Earnings PriorYearRetainedEarnings	-67000000	USD
CY2020Q3	us-gaap	Stockholders Equity StockholdersEquity	64487000000	USD
CY2019Q2	us-gaap	Stockholders Equity StockholdersEquity	26967000000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	870000000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-257000000	USD
CY2019Q3	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	140000000	USD
CY2019Q3	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	55000000	USD
CY2019Q3	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	4000000	USD
CY2019Q3	tmus	Stock Issued During Period Shares Distribution From Ndqc Plan StockIssuedDuringPeriodSharesDistributionFromNDQCPlan	3755	shares
CY2019Q3	us-gaap	Stockholders Equity StockholdersEquity	27771000000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	24718000000	USD
	us-gaap	Net Income Loss NetIncomeLoss	2717000000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-738000000	USD
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	404000000	USD
	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	1000000	USD
	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	124000000	USD
	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	108000000	USD
	tmus	Prior Year Retained Earnings PriorYearRetainedEarnings	653000000	USD
CY2019Q3	us-gaap	Stockholders Equity StockholdersEquity	27771000000	USD
	us-gaap	Use Of Estimates UseOfEstimates	Estimates are based on historical experience, where applicable, and other assumptions which our management believes are reasonable under the circumstances, including but not limited to the valuation of assets acquired and liabilities assumed through the Merger with Sprint and the potential impacts arising from the COVID-19 pandemic. These estimates are inherently subject to judgment and actual results could differ from those estimates.
	tmus	Device Upgrade Period DeviceUpgradePeriod	P18M
CY2020Q3	tmus	Receivable With Imputed Interest Discount And Allowances Percentage Of Gross Accounts Receivable ReceivableWithImputedInterestDiscountAndAllowancesPercentageOfGrossAccountsReceivable	0.078
CY2019Q4	tmus	Receivable With Imputed Interest Discount And Allowances Percentage Of Gross Accounts Receivable ReceivableWithImputedInterestDiscountAndAllowancesPercentageOfGrossAccountsReceivable	0.070
CY2020Q1	us-gaap	Share Price SharePrice	83.90
	tmus	Numberof Portfolio Segments NumberofPortfolioSegments	2	segment
	tmus	Numberof Customer Classes NumberofCustomerClasses	2	class
CY2020Q3	us-gaap	Notes Receivable Gross NotesReceivableGross	5018000000	USD
CY2019Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	4582000000	USD
CY2020Q3	us-gaap	Receivable With Imputed Interest Discount ReceivableWithImputedInterestDiscount	248000000	USD
CY2019Q4	us-gaap	Receivable With Imputed Interest Discount ReceivableWithImputedInterestDiscount	299000000	USD
CY2020Q3	us-gaap	Receivable With Imputed Interest Net Amount ReceivableWithImputedInterestNetAmount	4770000000	USD
CY2019Q4	us-gaap	Receivable With Imputed Interest Net Amount ReceivableWithImputedInterestNetAmount	4283000000	USD
CY2020Q3	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	289000000	USD
CY2019Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	100000000	USD
CY2020Q3	us-gaap	Notes Receivable Net NotesReceivableNet	4481000000	USD
CY2019Q4	us-gaap	Notes Receivable Net NotesReceivableNet	4183000000	USD
CY2020Q3	us-gaap	Notes Receivable Net NotesReceivableNet	4481000000	USD
CY2019Q4	us-gaap	Notes Receivable Net NotesReceivableNet	4183000000	USD
CY2020Q3	us-gaap	Receivable With Imputed Interest Net Amount ReceivableWithImputedInterestNetAmount	4770000000	USD
CY2019Q4	tmus	Unamortized Imputed Discountand Allowancefor Credit Losses UnamortizedImputedDiscountandAllowanceforCreditLosses	460000000	USD
CY2018Q4	tmus	Unamortized Imputed Discountand Allowancefor Credit Losses UnamortizedImputedDiscountandAllowanceforCreditLosses	516000000	USD
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	489000000	USD
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	218000000	USD
	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	244000000	USD
	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	242000000	USD
	tmus	Receivable With Imputed Interest Discount Increase Decrease ReceivableWithImputedInterestDiscountIncreaseDecrease	60000000	USD
	tmus	Receivable With Imputed Interest Discount Increase Decrease ReceivableWithImputedInterestDiscountIncreaseDecrease	91000000	USD
	us-gaap	Financing Receivable Significant Sales FinancingReceivableSignificantSales	111000000	USD
	us-gaap	Financing Receivable Significant Sales FinancingReceivableSignificantSales	127000000	USD
CY2020Q3	tmus	Unamortized Imputed Discountand Allowancefor Credit Losses UnamortizedImputedDiscountandAllowanceforCreditLosses	745000000	USD
CY2019Q3	tmus	Unamortized Imputed Discountand Allowancefor Credit Losses UnamortizedImputedDiscountandAllowanceforCreditLosses	456000000	USD
CY2020Q3	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	40276000000	USD
CY2019Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	33118000000	USD
CY2020Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	38567000000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	21984000000	USD
CY2020Q3	us-gaap	Depreciation Depreciation	3800000000	USD
CY2019Q3	us-gaap	Depreciation Depreciation	1700000000	USD
	us-gaap	Depreciation Depreciation	9200000000	USD
	us-gaap	Depreciation Depreciation	4800000000	USD
CY2020Q3	tmus	Depreciation Expensefor Leased Wireless Devices DepreciationExpenseforLeasedWirelessDevices	1000000000.0	USD
CY2019Q3	tmus	Depreciation Expensefor Leased Wireless Devices DepreciationExpenseforLeasedWirelessDevices	108000000	USD
	tmus	Depreciation Expensefor Leased Wireless Devices DepreciationExpenseforLeasedWirelessDevices	2100000000	USD
	tmus	Depreciation Expensefor Leased Wireless Devices DepreciationExpenseforLeasedWirelessDevices	417000000	USD
CY2020Q3	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	108000000	USD
CY2019Q3	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	118000000	USD
	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	339000000	USD
	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	361000000	USD
CY2019Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	659000000	USD
CY2018Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	609000000	USD
	tmus	Asset Retirement Obligation Liabilities Assumed In Business Combination AssetRetirementObligationLiabilitiesAssumedInBusinessCombination	1062000000	USD
CY2019	tmus	Asset Retirement Obligation Liabilities Assumed In Business Combination AssetRetirementObligationLiabilitiesAssumedInBusinessCombination	0	USD
	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	9000000	USD
CY2019	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	35000000	USD
	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	16000000	USD
CY2019	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	2000000	USD
	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	37000000	USD
CY2019	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	32000000	USD
	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	0	USD
CY2019	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	-15000000	USD
CY2020Q3	us-gaap	Asset Retirement Obligation AssetRetirementObligation	1751000000	USD
CY2019Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	659000000	USD
CY2020Q3	us-gaap	Capitalized Costs Asset Retirement Costs CapitalizedCostsAssetRetirementCosts	965000000	USD
CY2019Q4	us-gaap	Capitalized Costs Asset Retirement Costs CapitalizedCostsAssetRetirementCosts	159000000	USD
	us-gaap	Capitalized Computer Software Impairments1 CapitalizedComputerSoftwareImpairments1	200000000	USD
	us-gaap	Capitalized Computer Software Impairments1 CapitalizedComputerSoftwareImpairments1	0	USD
CY2019Q3	us-gaap	Capitalized Computer Software Impairments1 CapitalizedComputerSoftwareImpairments1	0	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	7866000000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	2206000000	USD
CY2019Q4	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	10766000000	USD
CY2019Q4	us-gaap	Goodwill Gross GoodwillGross	1901000000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	1930000000	USD
	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	218000000	USD
CY2020Q3	us-gaap	Goodwill Goodwill	10906000000	USD
CY2020Q3	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	10985000000	USD
	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	218000000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	5660000000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	1527000000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	1412000000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	115000000	USD
CY2020Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	383000000	USD
CY2019Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	18000000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	794000000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	53000000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Rolling Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextRollingTwelveMonths	1318000000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Rolling Year Two FiniteLivedIntangibleAssetsAmortizationExpenseRollingYearTwo	1040000000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Rolling Year Three FiniteLivedIntangibleAssetsAmortizationExpenseRollingYearThree	866000000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Rolling Year Four FiniteLivedIntangibleAssetsAmortizationExpenseRollingYearFour	709000000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Rolling Year Five FiniteLivedIntangibleAssetsAmortizationExpenseRollingYearFive	551000000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Rolling After Year Five FiniteLivedIntangibleAssetsAmortizationExpenseRollingAfterYearFive	1176000000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	5660000000	USD
CY2020Q1	us-gaap	Payments For Proceeds From Hedge Investing Activities PaymentsForProceedsFromHedgeInvestingActivities	-580000000	USD
CY2019Q4	us-gaap	Payments For Proceeds From Hedge Investing Activities PaymentsForProceedsFromHedgeInvestingActivities	-632000000	USD
CY2020Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-1600000000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-868000000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	44000000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	83000000	USD
	us-gaap	Cash Flow Hedge Gain Loss To Be Reclassified Within Twelve Months CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths	185000000	USD
CY2020Q3	us-gaap	Guarantee Obligations Current Carrying Value GuaranteeObligationsCurrentCarryingValue	45000000	USD
CY2019Q4	us-gaap	Guarantee Obligations Current Carrying Value GuaranteeObligationsCurrentCarryingValue	62000000	USD
CY2020Q3	us-gaap	Debt Instrument Face Amount DebtInstrumentFaceAmount	46000000000	USD
CY2020Q3	us-gaap	Deferred Finance Costs Gross DeferredFinanceCostsGross	567000000	USD
	us-gaap	Proceeds From Issuance Of Senior Long Term Debt ProceedsFromIssuanceOfSeniorLongTermDebt	45433000000	USD
CY2020Q3	us-gaap	Debt Instrument Repurchased Face Amount DebtInstrumentRepurchasedFaceAmount	4665000000	USD
	tmus	Writeoffof Premiums Discountsand Issuance Costs WriteoffofPremiumsDiscountsandIssuanceCosts	0	USD
	tmus	Reimbursement Of Commitment Letter Fees ReimbursementOfCommitmentLetterFees	0	USD
CY2020Q3	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	546000000	USD
CY2019Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	113000000	USD
CY2020Q3	tmus	Minimum Lease Payments Failed Sale Leaseback Transaction Next Twelve Months MinimumLeasePaymentsFailedSaleLeasebackTransactionNextTwelveMonths	393000000	USD
CY2020Q3	tmus	Minimum Lease Payments Failed Sale Leaseback Transactions Within Two And Three Years MinimumLeasePaymentsFailedSaleLeasebackTransactionsWithinTwoAndThreeYears	738000000	USD
CY2020Q3	tmus	Minimum Lease Payments Failed Sale Leaseback Transactions Within Four And Five Years MinimumLeasePaymentsFailedSaleLeasebackTransactionsWithinFourAndFiveYears	591000000	USD
CY2020Q3	tmus	Minimum Lease Payments Failed Sale Leaseback Transactions Thereafter MinimumLeasePaymentsFailedSaleLeasebackTransactionsThereafter	694000000	USD
CY2019Q4	us-gaap	Contract With Customer Asset Net ContractWithCustomerAssetNet	63000000	USD
CY2019Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	560000000	USD
CY2020Q3	us-gaap	Contract With Customer Asset Net ContractWithCustomerAssetNet	243000000	USD
CY2020Q3	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	783000000	USD
	us-gaap	Increase Decrease In Contract With Customer Asset IncreaseDecreaseInContractWithCustomerAsset	180000000	USD
	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	223000000	USD
CY2020Q3	us-gaap	Contract With Customer Asset Net Current ContractWithCustomerAssetNetCurrent	187000000	USD
CY2019Q4	us-gaap	Contract With Customer Asset Net Current ContractWithCustomerAssetNetCurrent	50000000	USD
CY2020Q3	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	5000000	USD
CY2019Q3	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	39000000	USD
	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	543000000	USD
	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	642000000	USD
CY2020Q3	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	382000000	USD
CY2020Q3	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	1300000000	USD
CY2020Q3	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	1400000000	USD
CY2020Q3	us-gaap	Capitalized Contract Cost Net CapitalizedContractCostNet	1000000000.0	USD
CY2019Q4	us-gaap	Capitalized Contract Cost Net CapitalizedContractCostNet	906000000	USD
CY2020Q3	us-gaap	Capitalized Contract Cost Amortization Period CapitalizedContractCostAmortizationPeriod	P24M
CY2020Q3	us-gaap	Capitalized Contract Cost Amortization CapitalizedContractCostAmortization	221000000	USD
CY2019Q3	us-gaap	Capitalized Contract Cost Amortization CapitalizedContractCostAmortization	162000000	USD
	us-gaap	Capitalized Contract Cost Amortization CapitalizedContractCostAmortization	631000000	USD
	us-gaap	Capitalized Contract Cost Amortization CapitalizedContractCostAmortization	415000000	USD
	us-gaap	Capitalized Contract Cost Impairment Loss CapitalizedContractCostImpairmentLoss	0	USD
	us-gaap	Capitalized Contract Cost Impairment Loss CapitalizedContractCostImpairmentLoss	0	USD
CY2019Q3	us-gaap	Capitalized Contract Cost Impairment Loss CapitalizedContractCostImpairmentLoss	0	USD
CY2020Q3	us-gaap	Capitalized Contract Cost Impairment Loss CapitalizedContractCostImpairmentLoss	0	USD
CY2020Q3	us-gaap	Share Based Compensation ShareBasedCompensation	161000000	USD
CY2019Q3	us-gaap	Share Based Compensation ShareBasedCompensation	126000000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	558000000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	366000000	USD
CY2020Q3	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	34000000	USD
CY2019Q3	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	25000000	USD
	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	105000000	USD
	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	70000000	USD
CY2020Q3	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	72000000	USD
CY2019Q3	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	4000000	USD
	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	351000000	USD
	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	108000000	USD
CY2020Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Maximum Employee Subscription Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate	0.15
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Discount From Market Price Purchase Date ShareBasedCompensationArrangementByShareBasedPaymentAwardDiscountFromMarketPricePurchaseDate	0.15
	tmus	Employee Stock Purchase Plan Offering Period EmployeeStockPurchasePlanOfferingPeriod	P6M
	tmus	Employee Stock Purchase Plans Number Of Securities Remaining For Future Sale And Issuance EmployeeStockPurchasePlansNumberOfSecuritiesRemainingForFutureSaleAndIssuance	4253858	shares
	tmus	Aggregate Number Of Shares Annual Increase Employee Stock Purchase Plans AggregateNumberOfSharesAnnualIncreaseEmployeeStockPurchasePlans	5000000	shares
CY2020Q1	tmus	Additional Shares Of Common Stock Employee Stock Purchase Plan AdditionalSharesOfCommonStockEmployeeStockPurchasePlan	5000000	shares
	tmus	Share Based Compensation Arrangement By Share Based Payment Award Incentive Compensation Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardIncentiveCompensationGrantDateFairValue	163000000	USD
CY2020Q3	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	18000000	USD
	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	35000000	USD
CY2020Q3	us-gaap	Defined Benefit Plan Expected Return On Plan Assets DefinedBenefitPlanExpectedReturnOnPlanAssets	15000000	USD
	us-gaap	Defined Benefit Plan Expected Return On Plan Assets DefinedBenefitPlanExpectedReturnOnPlanAssets	30000000	USD
CY2020Q3	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	3000000	USD
	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	5000000	USD
CY2020Q2	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	1200000000	USD
CY2020Q3	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	1200000000	USD
CY2020Q2	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	2100000000	USD
CY2020Q3	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	2100000000	USD
CY2020Q3	us-gaap	Defined Benefit Plan Funded Status Of Plan DefinedBenefitPlanFundedStatusOfPlan	-900000000	USD
CY2020Q2	us-gaap	Defined Benefit Plan Funded Status Of Plan DefinedBenefitPlanFundedStatusOfPlan	-900000000	USD
CY2020Q3	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	26000000	USD
	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	42000000	USD
CY2020Q3	us-gaap	Defined Benefit Plan Expected Future Employer Contributions Remainder Of Fiscal Year DefinedBenefitPlanExpectedFutureEmployerContributionsRemainderOfFiscalYear	16000000	USD
CY2020Q3	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	49000000	USD
CY2019Q3	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	24000000	USD
	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	128000000	USD
	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	88000000	USD
	us-gaap	Cash Provided By Used In Operating Activities Discontinued Operations CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations	611000000	USD
CY2020Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	407000000	USD
CY2019Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	325000000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	715000000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	921000000	USD
CY2020Q3	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.245
CY2019Q3	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.271
	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.264
	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.253
CY2020Q3	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	1253000000	USD
CY2019Q3	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	870000000	USD
	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	1994000000	USD
	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	2717000000	USD
CY2020Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	0	USD
CY2019Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	0	USD
	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	320000000	USD
	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	0	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	1253000000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	870000000	USD
	us-gaap	Net Income Loss NetIncomeLoss	2314000000	USD
	us-gaap	Net Income Loss NetIncomeLoss	2717000000	USD
CY2020Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	1238450665	shares
CY2019Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	854578241	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	1111511964	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	853391370	shares
CY2020Q3	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	11348075	shares
CY2019Q3	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	8112510	shares
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	10528564	shares
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	9463284	shares
CY2020Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	1249798740	shares
CY2019Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	862690751	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	1122040528	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	862854654	shares
CY2020Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.01
CY2019Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.02
	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.79
	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	3.18
CY2020Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0
CY2019Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0
	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.29
	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0
CY2020Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.01
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.02
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.08
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.18
CY2020Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.00
CY2019Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.01
	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.78
	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	3.15
CY2020Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0
CY2019Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0
	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.28
	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0
CY2020Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.00
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.01
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.06
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.15
CY2020Q2	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	2000000000	shares
CY2020Q3	us-gaap	Operating Lease Expense OperatingLeaseExpense	1259000000	USD
CY2019Q3	us-gaap	Operating Lease Expense OperatingLeaseExpense	657000000	USD
	us-gaap	Operating Lease Expense OperatingLeaseExpense	3082000000	USD
	us-gaap	Operating Lease Expense OperatingLeaseExpense	1893000000	USD
CY2020Q3	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	183000000	USD
CY2019Q3	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	146000000	USD
	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	508000000	USD
	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	376000000	USD
CY2020Q3	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	20000000	USD
CY2019Q3	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	21000000	USD
	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	60000000	USD
	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	61000000	USD
CY2020Q3	tmus	Finance Lease Expense FinanceLeaseExpense	203000000	USD
CY2019Q3	tmus	Finance Lease Expense FinanceLeaseExpense	167000000	USD
	tmus	Finance Lease Expense FinanceLeaseExpense	568000000	USD
	tmus	Finance Lease Expense FinanceLeaseExpense	437000000	USD
CY2020Q3	us-gaap	Variable Lease Cost VariableLeaseCost	106000000	USD
CY2019Q3	us-gaap	Variable Lease Cost VariableLeaseCost	62000000	USD
	us-gaap	Variable Lease Cost VariableLeaseCost	239000000	USD
	us-gaap	Variable Lease Cost VariableLeaseCost	185000000	USD
CY2020Q3	us-gaap	Lease Cost LeaseCost	1568000000	USD
CY2019Q3	us-gaap	Lease Cost LeaseCost	886000000	USD
	us-gaap	Lease Cost LeaseCost	3889000000	USD
	us-gaap	Lease Cost LeaseCost	2515000000	USD
CY2020Q3	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P10Y
CY2020Q3	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P3Y
CY2020Q3	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.040
CY2020Q3	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.035
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Due Next Rolling Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextRollingTwelveMonths	4717000000	USD
CY2020Q3	us-gaap	Finance Lease Liability Payments Due In Next Rolling Twelve Months FinanceLeaseLiabilityPaymentsDueInNextRollingTwelveMonths	1100000000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Due In Rolling Year Two LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearTwo	4361000000	USD
CY2020Q3	us-gaap	Finance Lease Liability Payments Due In Rolling Year Two FinanceLeaseLiabilityPaymentsDueInRollingYearTwo	792000000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Due In Rolling Year Three LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearThree	3754000000	USD
CY2020Q3	us-gaap	Finance Lease Liability Payments Due In Rolling Year Three FinanceLeaseLiabilityPaymentsDueInRollingYearThree	426000000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Due In Rolling Year Four LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFour	3301000000	USD
CY2020Q3	us-gaap	Finance Lease Liability Payments Due In Rolling Year Four FinanceLeaseLiabilityPaymentsDueInRollingYearFour	89000000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Due In Rolling Year Five LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFive	2785000000	USD
CY2020Q3	us-gaap	Finance Lease Liability Payments Due In Rolling Year Five FinanceLeaseLiabilityPaymentsDueInRollingYearFive	61000000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Due After Rolling Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterRollingYearFive	19184000000	USD
CY2020Q3	us-gaap	Finance Lease Liability Payments Due In Rolling After Year Five FinanceLeaseLiabilityPaymentsDueInRollingAfterYearFive	72000000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	38102000000	USD
CY2020Q3	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	2540000000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	7786000000	USD
CY2020Q3	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	117000000	USD
CY2020Q3	us-gaap	Operating Lease Liability OperatingLeaseLiability	30316000000	USD
CY2020Q3	us-gaap	Finance Lease Liability FinanceLeaseLiability	2423000000	USD
CY2020Q3	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	19000000	USD
CY2019Q3	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	20000000	USD
	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	59000000	USD
	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	61000000	USD
CY2020Q3	tmus	Lessee Operating Lease Lease Notyet Commenced Payments Due LesseeOperatingLeaseLeaseNotyetCommencedPaymentsDue	283000000	USD
	tmus	Device Upgrade Period DeviceUpgradePeriod	P18M
CY2020Q3	us-gaap	Lessor Operating Lease Payments To Be Received Next Rolling Twelve Months LessorOperatingLeasePaymentsToBeReceivedNextRollingTwelveMonths	2315000000	USD
CY2020Q3	us-gaap	Lessor Operating Lease Payments To Be Received Rolling Year Two LessorOperatingLeasePaymentsToBeReceivedRollingYearTwo	156000000	USD
CY2020Q3	us-gaap	Lessor Operating Lease Payments To Be Received LessorOperatingLeasePaymentsToBeReceived	2471000000	USD
CY2020Q3	tmus	Purchase Obligation Due In Next Rolling Twelve Months PurchaseObligationDueInNextRollingTwelveMonths	4200000000	USD
CY2020Q3	tmus	Purchase Obligation Due In Rolling Year Two And Three PurchaseObligationDueInRollingYearTwoAndThree	3400000000	USD
CY2020Q3	tmus	Purchase Obligation Due In Rolling Year Four And Five PurchaseObligationDueInRollingYearFourAndFive	1600000000	USD
CY2020Q3	tmus	Purchase Obligation Due In Rolling After Year Five PurchaseObligationDueInRollingAfterYearFive	1500000000	USD
CY2020Q3	tmus	Lease And Service Credit Commitment Due In Next Rolling Twelve Months LeaseAndServiceCreditCommitmentDueInNextRollingTwelveMonths	328000000	USD
CY2020Q3	tmus	Lease And Service Credit Commitment Due In Rolling Year Two And Three LeaseAndServiceCreditCommitmentDueInRollingYearTwoAndThree	698000000	USD
CY2020Q3	tmus	Lease And Service Credit Commitment Due In Rolling Year Four And Five LeaseAndServiceCreditCommitmentDueInRollingYearFourAndFive	609000000	USD
CY2020Q3	tmus	Lease And Service Credit Commitment Due In Rolling After Year Five LeaseAndServiceCreditCommitmentDueInRollingAfterYearFive	5100000000	USD
CY2020Q3	tmus	Lease And Service Credit Commitment Maximum Remaining Commitment LeaseAndServiceCreditCommitmentMaximumRemainingCommitment	92000000	USD
CY2020Q3	tmus	Merger Commitment Settlement Due In Next Rolling Twelve Months MergerCommitmentSettlementDueInNextRollingTwelveMonths	24000000	USD
CY2020Q3	tmus	Merger Commitment Settlement Due In Rolling Year Two And Three MergerCommitmentSettlementDueInRollingYearTwoAndThree	36000000	USD
CY2020Q3	tmus	Merger Commitment Settlement Due In Rolling Year Four And Five MergerCommitmentSettlementDueInRollingYearFourAndFive	13000000	USD
CY2020Q3	us-gaap	Restructuring Charges RestructuringCharges	98000000	USD
	us-gaap	Restructuring Charges RestructuringCharges	580000000	USD
CY2020Q3	us-gaap	Operating Lease Right Of Use Asset Amortization Expense OperatingLeaseRightOfUseAssetAmortizationExpense	80000000	USD
	us-gaap	Operating Lease Right Of Use Asset Amortization Expense OperatingLeaseRightOfUseAssetAmortizationExpense	80000000	USD
CY2020Q2	us-gaap	Restructuring Reserve RestructuringReserve	0	USD
	us-gaap	Restructuring Charges RestructuringCharges	580000000	USD
	us-gaap	Payments For Restructuring PaymentsForRestructuring	268000000	USD
	us-gaap	Restructuring Reserve Accrual Adjustment1 RestructuringReserveAccrualAdjustment1	-116000000	USD
CY2020Q3	us-gaap	Restructuring Reserve RestructuringReserve	196000000	USD
CY2020Q3	us-gaap	Accounts Payable Trade Current AccountsPayableTradeCurrent	3862000000	USD
CY2019Q4	us-gaap	Accounts Payable Trade Current AccountsPayableTradeCurrent	4322000000	USD
CY2020Q3	us-gaap	Accrual For Taxes Other Than Income Taxes Current AccrualForTaxesOtherThanIncomeTaxesCurrent	1151000000	USD
CY2019Q4	us-gaap	Accrual For Taxes Other Than Income Taxes Current AccrualForTaxesOtherThanIncomeTaxesCurrent	802000000	USD
CY2020Q3	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	1386000000	USD
CY2019Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	682000000	USD
CY2020Q3	us-gaap	Interest Payable Current InterestPayableCurrent	760000000	USD
CY2019Q4	us-gaap	Interest Payable Current InterestPayableCurrent	227000000	USD
CY2020Q3	us-gaap	Accrued Sales Commission Current AccruedSalesCommissionCurrent	321000000	USD
CY2019Q4	us-gaap	Accrued Sales Commission Current AccruedSalesCommissionCurrent	251000000	USD
CY2020Q3	tmus	Accrued Liabilities Toll And Interconnect AccruedLiabilitiesTollAndInterconnect	179000000	USD
CY2019Q4	tmus	Accrued Liabilities Toll And Interconnect AccruedLiabilitiesTollAndInterconnect	156000000	USD
CY2020Q3	us-gaap	Accrued Advertising Current AccruedAdvertisingCurrent	107000000	USD
CY2019Q4	us-gaap	Accrued Advertising Current AccruedAdvertisingCurrent	127000000	USD
CY2020Q3	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	623000000	USD
CY2019Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	179000000	USD
CY2020Q3	us-gaap	Accounts Payable And Accrued Liabilities Current AccountsPayableAndAccruedLiabilitiesCurrent	8389000000	USD
CY2019Q4	us-gaap	Accounts Payable And Accrued Liabilities Current AccountsPayableAndAccruedLiabilitiesCurrent	6746000000	USD
CY2020Q3	us-gaap	Interest Paid Net InterestPaidNet	940000000	USD
CY2019Q3	us-gaap	Interest Paid Net InterestPaidNet	327000000	USD
	tmus	Noncash Or Part Noncash Acquisition Consideration NoncashOrPartNoncashAcquisitionConsideration	33533000000	USD
	tmus	Noncash Or Part Noncash Acquisition Consideration NoncashOrPartNoncashAcquisitionConsideration	0	USD
	us-gaap	Interest Paid Net InterestPaidNet	1889000000	USD
	us-gaap	Interest Paid Net InterestPaidNet	912000000	USD
CY2020Q3	us-gaap	Operating Lease Payments OperatingLeasePayments	1349000000	USD
CY2019Q3	us-gaap	Operating Lease Payments OperatingLeasePayments	703000000	USD
	us-gaap	Operating Lease Payments OperatingLeasePayments	3493000000	USD
	us-gaap	Operating Lease Payments OperatingLeasePayments	2094000000	USD
CY2020Q3	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	63000000	USD
CY2019Q3	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	5000000	USD
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	118000000	USD
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	77000000	USD
CY2020Q3	us-gaap	Consideration Received For Beneficial Interest Obtained For Transferring Financial Asset ConsiderationReceivedForBeneficialInterestObtainedForTransferringFinancialAsset	1535000000	USD
CY2019Q3	us-gaap	Consideration Received For Beneficial Interest Obtained For Transferring Financial Asset ConsiderationReceivedForBeneficialInterestObtainedForTransferringFinancialAsset	1734000000	USD
	us-gaap	Consideration Received For Beneficial Interest Obtained For Transferring Financial Asset ConsiderationReceivedForBeneficialInterestObtainedForTransferringFinancialAsset	4634000000	USD
	us-gaap	Consideration Received For Beneficial Interest Obtained For Transferring Financial Asset ConsiderationReceivedForBeneficialInterestObtainedForTransferringFinancialAsset	4862000000	USD
CY2020Q3	tmus	Noncash Or Part Noncash Acquisition Consideration NoncashOrPartNoncashAcquisitionConsideration	0	USD
CY2019Q3	tmus	Noncash Or Part Noncash Acquisition Consideration NoncashOrPartNoncashAcquisitionConsideration	0	USD
CY2020Q3	tmus	Change In Capital Expenditures Incurred But Not Yet Paid ChangeInCapitalExpendituresIncurredButNotYetPaid	216000000	USD
CY2019Q3	tmus	Change In Capital Expenditures Incurred But Not Yet Paid ChangeInCapitalExpendituresIncurredButNotYetPaid	460000000	USD
	tmus	Change In Capital Expenditures Incurred But Not Yet Paid ChangeInCapitalExpendituresIncurredButNotYetPaid	555000000	USD
	tmus	Change In Capital Expenditures Incurred But Not Yet Paid ChangeInCapitalExpendituresIncurredButNotYetPaid	906000000	USD
CY2020Q3	us-gaap	Noncash Or Part Noncash Acquisition Fixed Assets Acquired1 NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1	599000000	USD
CY2019Q3	us-gaap	Noncash Or Part Noncash Acquisition Fixed Assets Acquired1 NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1	298000000	USD
	us-gaap	Noncash Or Part Noncash Acquisition Fixed Assets Acquired1 NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1	2352000000	USD
	us-gaap	Noncash Or Part Noncash Acquisition Fixed Assets Acquired1 NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1	612000000	USD
CY2020Q3	us-gaap	Noncash Or Part Noncash Acquisition Inventory Acquired1 NoncashOrPartNoncashAcquisitionInventoryAcquired1	433000000	USD
CY2019Q3	us-gaap	Noncash Or Part Noncash Acquisition Inventory Acquired1 NoncashOrPartNoncashAcquisitionInventoryAcquired1	65000000	USD
	us-gaap	Noncash Or Part Noncash Acquisition Inventory Acquired1 NoncashOrPartNoncashAcquisitionInventoryAcquired1	1030000000	USD
	us-gaap	Noncash Or Part Noncash Acquisition Inventory Acquired1 NoncashOrPartNoncashAcquisitionInventoryAcquired1	189000000	USD
CY2020Q3	us-gaap	Noncash Or Part Noncash Acquisition Debt Assumed1 NoncashOrPartNoncashAcquisitionDebtAssumed1	0	USD
CY2019Q3	us-gaap	Noncash Or Part Noncash Acquisition Debt Assumed1 NoncashOrPartNoncashAcquisitionDebtAssumed1	475000000	USD
	us-gaap	Noncash Or Part Noncash Acquisition Debt Assumed1 NoncashOrPartNoncashAcquisitionDebtAssumed1	38000000	USD
	us-gaap	Noncash Or Part Noncash Acquisition Debt Assumed1 NoncashOrPartNoncashAcquisitionDebtAssumed1	775000000	USD
CY2020Q3	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	11833000000	USD
CY2019Q3	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	989000000	USD
	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	13046000000	USD
	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	3083000000	USD
CY2020Q3	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	219000000	USD
CY2019Q3	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	395000000	USD
	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	912000000	USD
	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	943000000	USD

Files In Submission

Name	View Source	Status
0001283699-20-000193-index-headers.html	Edgar Link	pending
0001283699-20-000193-index.html	Edgar Link	pending
0001283699-20-000193.txt	Edgar Link	pending
0001283699-20-000193-xbrl.zip	Edgar Link	pending
a101mnsa-finalredacted.htm	Edgar Link	pending
a102spectrumlicensepur.htm	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
MetaLinks.json	Edgar Link	pending
ngtmus09302020ex311.htm	Edgar Link	pending
ngtmus09302020ex312.htm	Edgar Link	pending
ngtmus09302020ex321.htm	Edgar Link	pending
ngtmus09302020ex322.htm	Edgar Link	pending
R1.htm	Edgar Link	pending
R10.htm	Edgar Link	pending
R100.htm	Edgar Link	pending
R101.htm	Edgar Link	pending
R102.htm	Edgar Link	pending
R103.htm	Edgar Link	pending
R104.htm	Edgar Link	pending
R105.htm	Edgar Link	pending
R106.htm	Edgar Link	pending
R107.htm	Edgar Link	pending
R108.htm	Edgar Link	pending
R109.htm	Edgar Link	pending
R11.htm	Edgar Link	pending
R110.htm	Edgar Link	pending
R12.htm	Edgar Link	pending
R13.htm	Edgar Link	pending
R14.htm	Edgar Link	pending
R15.htm	Edgar Link	pending
R16.htm	Edgar Link	pending
R17.htm	Edgar Link	pending
R18.htm	Edgar Link	pending
R19.htm	Edgar Link	pending
R2.htm	Edgar Link	pending
R20.htm	Edgar Link	pending
R21.htm	Edgar Link	pending
R22.htm	Edgar Link	pending
R23.htm	Edgar Link	pending
R24.htm	Edgar Link	pending
R25.htm	Edgar Link	pending
R26.htm	Edgar Link	pending
R27.htm	Edgar Link	pending
R28.htm	Edgar Link	pending
R29.htm	Edgar Link	pending
R3.htm	Edgar Link	pending
R30.htm	Edgar Link	pending
R31.htm	Edgar Link	pending
R32.htm	Edgar Link	pending
R33.htm	Edgar Link	pending
R34.htm	Edgar Link	pending
R35.htm	Edgar Link	pending
R36.htm	Edgar Link	pending
R37.htm	Edgar Link	pending
R38.htm	Edgar Link	pending
R39.htm	Edgar Link	pending
R4.htm	Edgar Link	pending
R40.htm	Edgar Link	pending
R41.htm	Edgar Link	pending
R42.htm	Edgar Link	pending
R43.htm	Edgar Link	pending
R44.htm	Edgar Link	pending
R45.htm	Edgar Link	pending
R46.htm	Edgar Link	pending
R47.htm	Edgar Link	pending
R48.htm	Edgar Link	pending
R49.htm	Edgar Link	pending
R5.htm	Edgar Link	pending
R50.htm	Edgar Link	pending
R51.htm	Edgar Link	pending
R52.htm	Edgar Link	pending
R53.htm	Edgar Link	pending
R54.htm	Edgar Link	pending
R55.htm	Edgar Link	pending
R56.htm	Edgar Link	pending
R57.htm	Edgar Link	pending
R58.htm	Edgar Link	pending
R59.htm	Edgar Link	pending
R6.htm	Edgar Link	pending
R60.htm	Edgar Link	pending
R61.htm	Edgar Link	pending
R62.htm	Edgar Link	pending
R63.htm	Edgar Link	pending
R64.htm	Edgar Link	pending
R65.htm	Edgar Link	pending
R66.htm	Edgar Link	pending
R67.htm	Edgar Link	pending
R68.htm	Edgar Link	pending
R69.htm	Edgar Link	pending
R7.htm	Edgar Link	pending
R70.htm	Edgar Link	pending
R71.htm	Edgar Link	pending
R72.htm	Edgar Link	pending
R73.htm	Edgar Link	pending
R74.htm	Edgar Link	pending
R75.htm	Edgar Link	pending
R76.htm	Edgar Link	pending
R77.htm	Edgar Link	pending
R78.htm	Edgar Link	pending
R79.htm	Edgar Link	pending
R8.htm	Edgar Link	pending
R80.htm	Edgar Link	pending
R81.htm	Edgar Link	pending
R82.htm	Edgar Link	pending
R83.htm	Edgar Link	pending
R84.htm	Edgar Link	pending
R85.htm	Edgar Link	pending
R86.htm	Edgar Link	pending
R87.htm	Edgar Link	pending
R88.htm	Edgar Link	pending
R89.htm	Edgar Link	pending
R9.htm	Edgar Link	pending
R90.htm	Edgar Link	pending
R91.htm	Edgar Link	pending
R92.htm	Edgar Link	pending
R93.htm	Edgar Link	pending
R94.htm	Edgar Link	pending
R95.htm	Edgar Link	pending
R96.htm	Edgar Link	pending
R97.htm	Edgar Link	pending
R98.htm	Edgar Link	pending
R99.htm	Edgar Link	pending
report.css	Edgar Link	pending
Show.js	Edgar Link	pending
tmus-20200930.htm	Edgar Link	pending
tmus-20200930.xsd	Edgar Link	pending
tmus-20200930_cal.xml	Edgar Link	unprocessable
tmus-20200930_def.xml	Edgar Link	unprocessable
tmus-20200930_g1.jpg	Edgar Link	pending
tmus-20200930_htm.xml	Edgar Link	completed
tmus-20200930_lab.xml	Edgar Link	unprocessable
tmus-20200930_pre.xml	Edgar Link	unprocessable

Create your account

Find Stocks Worth Researching

Deeply Understand Businesses

Value Businesses Intelligently

$TMUS
T-Mobile US, Inc. Stock $tmus

2020 Q3 Form 10-Q Financial Statement

#000128369920000193 Filed on November 05, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$TMUS T-Mobile US, Inc. Stock $tmus

2020 Q3 Form 10-Q Financial Statement

#000128369920000193 Filed on November 05, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$TMUS
T-Mobile US, Inc. Stock $tmus