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

$tmus Overview Financials Valuation SEC Filings Company Website

2021 Q4 Form 10-K Financial Statement

#000128369922000018 Filed on February 11, 2022

Income Statement

Concept	2021 Q4	2021	2020 Q4
Revenue	$20.79B	$80.12B	$20.34B
YoY Change	2.18%	17.14%	71.25%
Cost Of Revenue	$9.328B	$34.57B	$9.119B
YoY Change	2.29%	25.2%	74.96%
Gross Profit	$11.46B	$45.55B	$11.22B
YoY Change	2.09%	11.68%	68.35%
Gross Profit Margin	55.12%	56.85%	55.17%
Selling, General & Admin	$5.160B	$20.24B	$4.605B
YoY Change	12.05%	6.93%	30.45%
% of Gross Profit	45.04%	44.43%	41.04%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$3.872B	$16.38B	$4.219B
YoY Change	-8.22%	15.77%	137.56%
% of Gross Profit	33.8%	35.97%	37.6%
Operating Expenses	$9.032B	$20.24B	$8.824B
YoY Change	2.36%	6.93%	66.3%
Operating Profit	$2.425B	$6.892B	$1.712B
YoY Change	41.65%	3.86%	38.74%
Interest Expense	-$821.0M	-$3.342B	-$790.0M
YoY Change	3.92%	23.73%	189.38%
% of Operating Profit	-33.86%	-48.49%	-46.14%
Other Income/Expense, Net	-$13.00M	-$3.541B	-$101.0M
YoY Change	-87.13%	14.01%	-2625.0%
Pretax Income	$229.0M	$3.351B	$821.0M
YoY Change	-72.11%	-5.07%	-14.92%
Income Tax	-$193.0M	$327.0M	$71.00M
% Of Pretax Income	-84.28%	9.76%	8.65%
Net Earnings	$422.0M	$3.024B	$750.0M
YoY Change	-43.73%	-1.31%	-0.13%
Net Earnings / Revenue	2.03%	3.77%	3.69%
Basic Earnings Per Share		$2.42	$0.60
Diluted Earnings Per Share	$336.0K	$2.41	$0.60
COMMON SHARES
Basic Shares Outstanding	1.249B shares	1.247B shares	1.242B shares
Diluted Shares Outstanding		1.255B shares	1.252B shares

Balance Sheet

Concept	2021 Q4	2021	2020 Q4
SHORT-TERM ASSETS
Cash & Short-Term Investments	$6.631B	$6.631B	$10.39B
YoY Change	-36.15%	-36.15%	579.65%
Cash & Equivalents	$6.631B	$6.631B	$10.39B
Short-Term Investments
Other Short-Term Assets	$2.005B	$2.465B	$2.496B
YoY Change	-19.67%	-13.27%	26.57%
Inventory	$2.567B	$2.567B	$2.527B
Prepaid Expenses	$746.0M		$624.0M
Receivables	$4.194B	$4.453B	$4.254B
Other Receivables	$4.775B	$4.775B	$3.599B
Total Short-Term Assets	$20.89B	$20.89B	$23.89B
YoY Change	-12.54%	-12.54%	156.69%
LONG-TERM ASSETS
Property, Plant & Equipment	$39.80B	$70.08B	$41.18B
YoY Change	-3.33%	-2.96%	87.3%
Goodwill	$12.19B		$11.12B
YoY Change	9.63%		476.01%
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets	$3.232B	$3.232B	$2.779B
YoY Change	16.3%	16.3%	46.96%
Total Long-Term Assets	$185.7B	$185.7B	$176.3B
YoY Change	5.33%	5.33%	127.11%
TOTAL ASSETS
Total Short-Term Assets	$20.89B	$20.89B	$23.89B
Total Long-Term Assets	$185.7B	$185.7B	$176.3B
Total Assets	$206.6B	$206.6B	$200.2B
YoY Change	3.2%	3.2%	130.28%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$6.499B	$6.499B	$5.564B
YoY Change	16.8%	16.8%	-17.52%
Accrued Expenses	$8.331B	$8.331B	$8.500B
YoY Change	-1.99%	-1.99%	271.67%
Deferred Revenue	$856.0M		$1.030B
YoY Change	-16.89%		63.23%
Short-Term Debt	$3.378B	$5.623B	$4.579B
YoY Change	-26.23%	22.8%	18216.0%
Long-Term Debt Due	$3.378B	$1.120B	$4.579B
YoY Change	-26.23%	5.36%	18216.0%
Total Short-Term Liabilities	$23.50B	$23.50B	$21.70B
YoY Change	8.28%	8.28%	73.54%
LONG-TERM LIABILITIES
Long-Term Debt	$67.08B	$72.83B	$61.83B
YoY Change	8.48%	2.55%	464.25%
Other Long-Term Liabilities	$5.097B	$30.92B	$5.412B
YoY Change	-5.82%	-3.78%	467.3%
Total Long-Term Liabilities	$114.0B	$103.7B	$113.1B
YoY Change	0.75%	0.58%	147.92%
TOTAL LIABILITIES
Total Short-Term Liabilities	$23.50B	$23.50B	$21.70B
Total Long-Term Liabilities	$114.0B	$103.7B	$113.1B
Total Liabilities	$137.5B	$137.5B	$134.8B
YoY Change	1.96%	1.96%	131.92%
SHAREHOLDERS EQUITY
Retained Earnings	-$2.812B		-$5.836B
YoY Change	-51.82%		-33.93%
Common Stock	$73.29B		$72.77B
YoY Change	0.71%		89.03%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$13.00M		$11.00M
YoY Change	18.18%		37.5%
Treasury Stock Shares	1.537M shares		1.540M shares
Shareholders Equity	$69.10B	$69.10B	$65.34B
YoY Change
Total Liabilities & Shareholders Equity	$206.6B	$206.6B	$200.2B
YoY Change	3.2%	3.2%	130.28%

Cashflow Statement

Concept	2021 Q4	2021	2020 Q4
OPERATING ACTIVITIES
Net Income	$422.0M	$3.024B	$750.0M
YoY Change	-43.73%	-1.31%	-0.13%
Depreciation, Depletion And Amortization	$3.872B	$16.38B	$4.219B
YoY Change	-8.22%	15.77%	137.56%
Cash From Operating Activities	$3.000B	$13.92B	$3.474B
YoY Change	-13.64%	61.08%	126.02%
INVESTING ACTIVITIES
Capital Expenditures	-$2.958B	$12.33B	-$3.807B
YoY Change	-22.3%	11.71%	201.9%
Acquisitions		$1.916B
YoY Change		-61.68%
Other Investing Activities	$1.046B	-$51.00M	$160.0M
YoY Change	553.75%	-115.09%	-57.22%
Cash From Investing Activities	-$1.912B	-$19.39B	-$3.647B
YoY Change	-47.57%	52.47%	311.16%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net		$0.00
YoY Change		-100.0%
Debt Paid & Issued, Net		$11.10B
YoY Change		-45.63%
Cash From Financing Activities	1.472B	$1.709B	3.979B
YoY Change	-63.01%	-86.86%	-613.42%
NET CHANGE
Cash From Operating Activities	3.000B	$13.92B	3.474B
Cash From Investing Activities	-1.912B	-$19.39B	-3.647B
Cash From Financing Activities	1.472B	$1.709B	3.979B
Net Change In Cash	2.560B	-$3.760B	3.806B
YoY Change	-32.74%	-142.08%	-3144.8%
FREE CASH FLOW
Cash From Operating Activities	$3.000B	$13.92B	$3.474B
Capital Expenditures	-$2.958B	$12.33B	-$3.807B
Free Cash Flow	$5.958B	$1.591B	$7.281B
YoY Change	-18.17%	-166.46%	160.22%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2021	dei	Entity Central Index Key EntityCentralIndexKey	0001283699
CY2021	dei	Amendment Flag AmendmentFlag	false
CY2021	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2021
CY2021	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
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CY2021Q4	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P1Y
CY2021Q4	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1
CY2021	dei	Document Type DocumentType	10-K
CY2021	dei	Document Annual Report DocumentAnnualReport	true
CY2021	dei	Document Period End Date DocumentPeriodEndDate	2021-12-31
CY2021	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2021	dei	Document Transition Report DocumentTransitionReport	false
CY2021	dei	Entity File Number EntityFileNumber	1-33409
CY2021	dei	Entity Registrant Name EntityRegistrantName	T-MOBILE US, INC.
CY2021	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2021	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	20-0836269
CY2021	dei	Entity Address Address Line1 EntityAddressAddressLine1	12920 SE 38th Street
CY2021	dei	Entity Address City Or Town EntityAddressCityOrTown	Bellevue
CY2022Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	1249289954	shares
CY2021	dei	Entity Address State Or Province EntityAddressStateOrProvince	WA
CY2021	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	98006-1350
CY2021	dei	City Area Code CityAreaCode	(425)
CY2021	dei	Local Phone Number LocalPhoneNumber	378-4000
CY2021	dei	Security12b Title Security12bTitle	Common Stock, par value $0.00001 per share
CY2021	dei	Trading Symbol TradingSymbol	TMUS
CY2021	dei	Security Exchange Name SecurityExchangeName	NASDAQ
CY2021	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2021	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2021	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2021	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2021	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2021	dei	Entity Small Business EntitySmallBusiness	false
CY2021	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
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CY2021	dei	Entity Shell Company EntityShellCompany	false
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CY2021	dei	Auditor Name AuditorName	PricewaterhouseCoopers LLP
CY2021	dei	Auditor Location AuditorLocation	Seattle, Washington
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CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	3530000000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	4603000000	USD
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	327000000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	786000000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1135000000	USD
CY2021	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	3024000000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	2744000000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	3468000000	USD
CY2021	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	0	USD
CY2020	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	320000000	USD
CY2019	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	0	USD
CY2021	us-gaap	Net Income Loss NetIncomeLoss	3024000000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	3064000000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	3468000000	USD
CY2021	us-gaap	Net Income Loss NetIncomeLoss	3024000000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	3064000000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	3468000000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTaxParent	49000000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTaxParent	-250000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTaxParent	-187000000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	140000000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	-723000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	-536000000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	0	USD
CY2020	us-gaap	Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	1000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	0	USD
CY2021	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-4000000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	4000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	0	USD
CY2021	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-28000000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-2000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	0	USD
CY2021	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-80000000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-6000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	0	USD
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	216000000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-713000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-536000000	USD
CY2021	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	3240000000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	2351000000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	2932000000	USD
CY2021	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	2.42
CY2020	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	2.40
CY2019	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	4.06
CY2021	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0
CY2020	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.28
CY2019	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.42
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.68
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.06
CY2021	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	2.41
CY2020	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	2.37
CY2019	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	4.02
CY2021	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0
CY2020	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.28
CY2019	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.41
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.65
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.02
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	1247154988	shares
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	1144206326	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	854143751	shares
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	1254769926	shares
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	1154749428	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	863433511	shares
CY2021	us-gaap	Net Income Loss NetIncomeLoss	3024000000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	3064000000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	3468000000	USD
CY2021	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	16383000000	USD
CY2020	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	14151000000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	6616000000	USD
CY2021	us-gaap	Share Based Compensation ShareBasedCompensation	540000000	USD
CY2020	us-gaap	Share Based Compensation ShareBasedCompensation	694000000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	495000000	USD
CY2021	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	197000000	USD
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	822000000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	1091000000	USD
CY2021	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	452000000	USD
CY2020	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	602000000	USD
CY2019	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	307000000	USD
CY2021	us-gaap	Securitization Financial Asset For Which Transfer Is Accounted As Sale Gain Loss On Sale SecuritizationFinancialAssetForWhichTransferIsAccountedAsSaleGainLossOnSale	-15000000	USD
CY2020	us-gaap	Securitization Financial Asset For Which Transfer Is Accounted As Sale Gain Loss On Sale SecuritizationFinancialAssetForWhichTransferIsAccountedAsSaleGainLossOnSale	-36000000	USD
CY2019	us-gaap	Securitization Financial Asset For Which Transfer Is Accounted As Sale Gain Loss On Sale SecuritizationFinancialAssetForWhichTransferIsAccountedAsSaleGainLossOnSale	-130000000	USD
CY2021	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-184000000	USD
CY2020	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-371000000	USD
CY2019	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-19000000	USD
CY2021	us-gaap	Asset Impairment Charges AssetImpairmentCharges	0	USD
CY2020	us-gaap	Asset Impairment Charges AssetImpairmentCharges	418000000	USD
CY2019	us-gaap	Asset Impairment Charges AssetImpairmentCharges	0	USD
CY2021	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	3225000000	USD
CY2020	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	3273000000	USD
CY2019	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	3709000000	USD
CY2021	us-gaap	Increase Decrease In Finance Receivables IncreaseDecreaseInFinanceReceivables	3141000000	USD
CY2020	us-gaap	Increase Decrease In Finance Receivables IncreaseDecreaseInFinanceReceivables	1453000000	USD
CY2019	us-gaap	Increase Decrease In Finance Receivables IncreaseDecreaseInFinanceReceivables	1015000000	USD
CY2021	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-201000000	USD
CY2020	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	2222000000	USD
CY2019	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	617000000	USD
CY2021	tmus	Increase Decreasein Operating Lease Rightof Use Asset IncreaseDecreaseinOperatingLeaseRightofUseAsset	-4964000000	USD
CY2020	tmus	Increase Decreasein Operating Lease Rightof Use Asset IncreaseDecreaseinOperatingLeaseRightofUseAsset	-3465000000	USD
CY2019	tmus	Increase Decreasein Operating Lease Rightof Use Asset IncreaseDecreaseinOperatingLeaseRightofUseAsset	-1896000000	USD
CY2021	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	573000000	USD
CY2020	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	402000000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	144000000	USD
CY2021	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	549000000	USD
CY2020	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-2123000000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	17000000	USD
CY2021	us-gaap	Increase Decrease In Operating Lease Liability IncreaseDecreaseInOperatingLeaseLiability	-5358000000	USD
CY2020	us-gaap	Increase Decrease In Operating Lease Liability IncreaseDecreaseInOperatingLeaseLiability	-3699000000	USD
CY2019	us-gaap	Increase Decrease In Operating Lease Liability IncreaseDecreaseInOperatingLeaseLiability	-2131000000	USD
CY2021	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-531000000	USD
CY2020	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-2178000000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	144000000	USD
CY2021	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	236000000	USD
CY2020	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	367000000	USD
CY2019	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	257000000	USD
CY2021	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	13917000000	USD
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	8640000000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	6824000000	USD
CY2021	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	210000000	USD
CY2020	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	440000000	USD
CY2019	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	473000000	USD
CY2021	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	12326000000	USD
CY2020	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	11034000000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	6391000000	USD
CY2021	us-gaap	Payments To Acquire Intangible Assets PaymentsToAcquireIntangibleAssets	9366000000	USD
CY2020	us-gaap	Payments To Acquire Intangible Assets PaymentsToAcquireIntangibleAssets	1333000000	USD
CY2019	us-gaap	Payments To Acquire Intangible Assets PaymentsToAcquireIntangibleAssets	967000000	USD
CY2021	tmus	Proceeds From Sales Of Tower Sites ProceedsFromSalesOfTowerSites	40000000	USD
CY2020	tmus	Proceeds From Sales Of Tower Sites ProceedsFromSalesOfTowerSites	0	USD
CY2019	tmus	Proceeds From Sales Of Tower Sites ProceedsFromSalesOfTowerSites	38000000	USD
CY2021	us-gaap	Proceeds From Collection Of Retained Interest In Securitized Receivables ProceedsFromCollectionOfRetainedInterestInSecuritizedReceivables	4131000000	USD
CY2020	us-gaap	Proceeds From Collection Of Retained Interest In Securitized Receivables ProceedsFromCollectionOfRetainedInterestInSecuritizedReceivables	3134000000	USD
CY2019	us-gaap	Proceeds From Collection Of Retained Interest In Securitized Receivables ProceedsFromCollectionOfRetainedInterestInSecuritizedReceivables	3876000000	USD
CY2021	us-gaap	Payments For Proceeds From Hedge Investing Activities PaymentsForProceedsFromHedgeInvestingActivities	0	USD
CY2020	us-gaap	Payments For Proceeds From Hedge Investing Activities PaymentsForProceedsFromHedgeInvestingActivities	-632000000	USD
CY2019	us-gaap	Payments For Proceeds From Hedge Investing Activities PaymentsForProceedsFromHedgeInvestingActivities	632000000	USD
CY2021	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	1916000000	USD
CY2020	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	5000000000	USD
CY2019	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	31000000	USD
CY2021	us-gaap	Proceeds From Divestiture Of Businesses Net Of Cash Divested ProceedsFromDivestitureOfBusinessesNetOfCashDivested	0	USD
CY2020	us-gaap	Proceeds From Divestiture Of Businesses Net Of Cash Divested ProceedsFromDivestitureOfBusinessesNetOfCashDivested	1224000000	USD
CY2019	us-gaap	Proceeds From Divestiture Of Businesses Net Of Cash Divested ProceedsFromDivestitureOfBusinessesNetOfCashDivested	0	USD
CY2021	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-51000000	USD
CY2020	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	338000000	USD
CY2019	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	18000000	USD
CY2021	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-19386000000	USD
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-12715000000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-4125000000	USD
CY2021	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	14727000000	USD
CY2020	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	35337000000	USD
CY2019	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	0	USD
CY2021	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	0	USD
CY2020	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	109000000	USD
CY2019	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	0	USD
CY2021	us-gaap	Proceeds From Secured Lines Of Credit ProceedsFromSecuredLinesOfCredit	0	USD
CY2020	us-gaap	Proceeds From Secured Lines Of Credit ProceedsFromSecuredLinesOfCredit	0	USD
CY2019	us-gaap	Proceeds From Secured Lines Of Credit ProceedsFromSecuredLinesOfCredit	2340000000	USD
CY2021	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	0	USD
CY2020	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	0	USD
CY2019	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	2340000000	USD
CY2021	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	1111000000	USD
CY2020	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	1021000000	USD
CY2019	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	798000000	USD
CY2021	tmus	Repayments Of Short Term Debt For Purchases Of Inventory Property And Equipment Net RepaymentsOfShortTermDebtForPurchasesOfInventoryPropertyAndEquipmentNet	184000000	USD
CY2020	tmus	Repayments Of Short Term Debt For Purchases Of Inventory Property And Equipment Net RepaymentsOfShortTermDebtForPurchasesOfInventoryPropertyAndEquipmentNet	481000000	USD
CY2019	tmus	Repayments Of Short Term Debt For Purchases Of Inventory Property And Equipment Net RepaymentsOfShortTermDebtForPurchasesOfInventoryPropertyAndEquipmentNet	775000000	USD
CY2021	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	11100000000	USD
CY2020	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	20416000000	USD
CY2019	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	600000000	USD
CY2021	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	0	USD
CY2020	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	19840000000	USD
CY2019	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	0	USD
CY2021	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	0	USD
CY2020	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	19536000000	USD
CY2019	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	0	USD
CY2021	us-gaap	Proceeds From Short Term Debt ProceedsFromShortTermDebt	0	USD
CY2020	us-gaap	Proceeds From Short Term Debt ProceedsFromShortTermDebt	18743000000	USD
CY2019	us-gaap	Proceeds From Short Term Debt ProceedsFromShortTermDebt	0	USD
CY2021	us-gaap	Repayments Of Other Short Term Debt RepaymentsOfOtherShortTermDebt	0	USD
CY2020	us-gaap	Repayments Of Other Short Term Debt RepaymentsOfOtherShortTermDebt	18929000000	USD
CY2019	us-gaap	Repayments Of Other Short Term Debt RepaymentsOfOtherShortTermDebt	0	USD
CY2021	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	316000000	USD
CY2020	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	439000000	USD
CY2019	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	156000000	USD
CY2021	us-gaap	Payments Of Debt Extinguishment Costs PaymentsOfDebtExtinguishmentCosts	116000000	USD
CY2020	us-gaap	Payments Of Debt Extinguishment Costs PaymentsOfDebtExtinguishmentCosts	82000000	USD
CY2019	us-gaap	Payments Of Debt Extinguishment Costs PaymentsOfDebtExtinguishmentCosts	28000000	USD
CY2021	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-191000000	USD
CY2020	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	103000000	USD
CY2019	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-17000000	USD
CY2021	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	1709000000	USD
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	13010000000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-2374000000	USD
CY2021	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-3760000000	USD
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	8935000000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	325000000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	10463000000	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
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	6703000000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	10463000000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1528000000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	24718000000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	3468000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-536000000	USD
CY2019	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	517000000	USD
CY2019	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	1000000	USD
CY2019	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	124000000	USD
CY2019	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	156000000	USD
CY2019	tmus	Prior Year Retained Earnings PriorYearRetainedEarnings	-653000000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	28789000000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	3064000000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-713000000	USD
CY2020	tmus	Adjustments To Additional Paid In Capital Executive Put Option AdjustmentsToAdditionalPaidInCapitalExecutivePutOption	1000000	USD
CY2020	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	750000000	USD
CY2020	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	48000000	USD
CY2020	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	148000000	USD
CY2020	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	439000000	USD
CY2020	tmus	Stock Issued During Period Value Transfers With Ndqc Plan StockIssuedDuringPeriodValueTransfersWithNDQCPlan	0	USD
CY2020	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	19766000000	USD
CY2020	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	19536000000	USD
CY2020	tmus	Adjustment To Additional Paid In Capital Purchase Price Consideration AdjustmentToAdditionalPaidInCapitalPurchasePriceConsideration	33533000000	USD
CY2020	tmus	Prior Year Retained Earnings PriorYearRetainedEarnings	67000000	USD
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	65344000000	USD
CY2021	us-gaap	Net Income Loss NetIncomeLoss	3024000000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	216000000	USD
CY2021	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	606000000	USD
CY2021	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	10000000	USD
CY2021	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	225000000	USD
CY2021	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	316000000	USD
CY2021	tmus	Adjustments To Additional Paid In Capital Remeasurement Of Uncertain Tax Positions AdjustmentsToAdditionalPaidInCapitalRemeasurementOfUncertainTaxPositions	7000000	USD
CY2021	tmus	Stock Issued During Period Value Transfers With Ndqc Plan StockIssuedDuringPeriodValueTransfersWithNDQCPlan	0	USD
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CY2021	tmus	Device Upgrade Period DeviceUpgradePeriod	P18M
CY2021	tmus	Device Upgrade Period DeviceUpgradePeriod	P18M
CY2021	us-gaap	Number Of Reporting Units NumberOfReportingUnits	1	customer
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CY2021	us-gaap	Excise And Sales Taxes ExciseAndSalesTaxes	216000000	USD
CY2020	us-gaap	Excise And Sales Taxes ExciseAndSalesTaxes	267000000	USD
CY2019	us-gaap	Excise And Sales Taxes ExciseAndSalesTaxes	93000000	USD
CY2021	tmus	Device Upgrade Period DeviceUpgradePeriod	P18M
CY2021Q4	us-gaap	Capitalized Contract Cost Amortization Period CapitalizedContractCostAmortizationPeriod	P24M
CY2021	us-gaap	Advertising Expense AdvertisingExpense	2200000000	USD
CY2020	us-gaap	Advertising Expense AdvertisingExpense	1800000000	USD
CY2019	us-gaap	Advertising Expense AdvertisingExpense	1600000000	USD
CY2021	tmus	Numberof Portfolio Segments NumberofPortfolioSegments	2	segment
CY2021	tmus	Numberof Customer Classes NumberofCustomerClasses	2	class
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CY2020Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	6213000000	USD
CY2021Q4	us-gaap	Receivable With Imputed Interest Discount ReceivableWithImputedInterestDiscount	378000000	USD
CY2020Q4	us-gaap	Receivable With Imputed Interest Discount ReceivableWithImputedInterestDiscount	325000000	USD
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CY2020Q4	us-gaap	Receivable With Imputed Interest Net Amount ReceivableWithImputedInterestNetAmount	5888000000	USD
CY2021Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	252000000	USD
CY2020Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	280000000	USD
CY2021Q4	us-gaap	Notes Receivable Net NotesReceivableNet	7577000000	USD
CY2020Q4	us-gaap	Notes Receivable Net NotesReceivableNet	5608000000	USD
CY2021Q4	us-gaap	Notes Receivable Net NotesReceivableNet	7577000000	USD
CY2020Q4	us-gaap	Notes Receivable Net NotesReceivableNet	5608000000	USD
CY2021Q4	us-gaap	Receivable With Imputed Interest Net Amount ReceivableWithImputedInterestNetAmount	7829000000	USD
CY2020Q4	tmus	Unamortized Imputed Discountand Allowancefor Credit Losses UnamortizedImputedDiscountandAllowanceforCreditLosses	799000000	USD
CY2019Q4	tmus	Unamortized Imputed Discountand Allowancefor Credit Losses UnamortizedImputedDiscountandAllowanceforCreditLosses	460000000	USD
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CY2021	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	452000000	USD
CY2020	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	602000000	USD
CY2019	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	307000000	USD
CY2021	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	527000000	USD
CY2020	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	380000000	USD
CY2019	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	332000000	USD
CY2021	tmus	Receivable With Imputed Interest Discount Increase Decrease ReceivableWithImputedInterestDiscountIncreaseDecrease	187000000	USD
CY2020	tmus	Receivable With Imputed Interest Discount Increase Decrease ReceivableWithImputedInterestDiscountIncreaseDecrease	171000000	USD
CY2019	tmus	Receivable With Imputed Interest Discount Increase Decrease ReceivableWithImputedInterestDiscountIncreaseDecrease	136000000	USD
CY2021	us-gaap	Financing Receivable Significant Sales FinancingReceivableSignificantSales	135000000	USD
CY2020	us-gaap	Financing Receivable Significant Sales FinancingReceivableSignificantSales	145000000	USD
CY2019	us-gaap	Financing Receivable Significant Sales FinancingReceivableSignificantSales	167000000	USD
CY2021Q4	tmus	Unamortized Imputed Discountand Allowancefor Credit Losses UnamortizedImputedDiscountandAllowanceforCreditLosses	776000000	USD
CY2020Q4	tmus	Unamortized Imputed Discountand Allowancefor Credit Losses UnamortizedImputedDiscountandAllowanceforCreditLosses	799000000	USD
CY2019Q4	tmus	Unamortized Imputed Discountand Allowancefor Credit Losses UnamortizedImputedDiscountandAllowanceforCreditLosses	460000000	USD
CY2021Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	49818000000	USD
CY2020Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	42395000000	USD
CY2021Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	39803000000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	41175000000	USD
CY2021	us-gaap	Depreciation Depreciation	15200000000	USD
CY2020	us-gaap	Depreciation Depreciation	13100000000	USD
CY2019	us-gaap	Depreciation Depreciation	6500000000	USD
CY2020	tmus	Depreciation Expensefor Leased Wireless Devices DepreciationExpenseforLeasedWirelessDevices	3100000000	USD
CY2021	tmus	Depreciation Expensefor Leased Wireless Devices DepreciationExpenseforLeasedWirelessDevices	3100000000	USD
CY2019	tmus	Depreciation Expensefor Leased Wireless Devices DepreciationExpenseforLeasedWirelessDevices	543000000	USD
CY2021	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	210000000	USD
CY2020	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	440000000	USD
CY2019	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	473000000	USD
CY2020Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	1817000000	USD
CY2019Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	659000000	USD
CY2021	tmus	Asset Retirement Obligation Liabilities Assumed In Business Combination AssetRetirementObligationLiabilitiesAssumedInBusinessCombination	0	USD
CY2020	tmus	Asset Retirement Obligation Liabilities Assumed In Business Combination AssetRetirementObligationLiabilitiesAssumedInBusinessCombination	1110000000	USD
CY2021	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	54000000	USD
CY2020	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	16000000	USD
CY2021	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	173000000	USD
CY2020	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	40000000	USD
CY2021	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	62000000	USD
CY2020	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	55000000	USD
CY2021	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	139000000	USD
CY2020	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	17000000	USD
CY2021Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	1899000000	USD
CY2020Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	1817000000	USD
CY2021Q4	us-gaap	Capitalized Costs Asset Retirement Costs CapitalizedCostsAssetRetirementCosts	613000000	USD
CY2020Q4	us-gaap	Capitalized Costs Asset Retirement Costs CapitalizedCostsAssetRetirementCosts	912000000	USD
CY2020	us-gaap	Capitalized Computer Software Impairments1 CapitalizedComputerSoftwareImpairments1	200000000	USD
CY2019	us-gaap	Capitalized Computer Software Impairments1 CapitalizedComputerSoftwareImpairments1	0	USD
CY2021	us-gaap	Capitalized Computer Software Impairments1 CapitalizedComputerSoftwareImpairments1	0	USD
CY2019Q4	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	10766000000	USD
CY2019Q4	us-gaap	Goodwill Gross GoodwillGross	1930000000	USD
CY2020	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	9405000000	USD
CY2020Q4	us-gaap	Goodwill Goodwill	11117000000	USD
CY2021Q4	us-gaap	Goodwill Goodwill	12188000000	USD
CY2021Q4	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	10984000000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	6925000000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	2192000000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	4733000000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	6665000000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	1367000000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	5298000000	USD
CY2021	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1300000000	USD
CY2020	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1200000000	USD
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	82000000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Rolling Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextRollingTwelveMonths	1072000000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Rolling Year Two FiniteLivedIntangibleAssetsAmortizationExpenseRollingYearTwo	917000000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Rolling Year Three FiniteLivedIntangibleAssetsAmortizationExpenseRollingYearThree	760000000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Rolling Year Four FiniteLivedIntangibleAssetsAmortizationExpenseRollingYearFour	601000000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Rolling Year Five FiniteLivedIntangibleAssetsAmortizationExpenseRollingYearFive	440000000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Rolling After Year Five FiniteLivedIntangibleAssetsAmortizationExpenseRollingAfterYearFive	943000000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	4733000000	USD
CY2020Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	4579000000	USD
CY2021Q4	tmus	Longterm Debtand Longterm Debtto Affiliates LongtermDebtandLongtermDebttoAffiliates	68570000000	USD
CY2020Q4	tmus	Longterm Debtand Longterm Debtto Affiliates LongtermDebtandLongtermDebttoAffiliates	66546000000	USD
CY2021Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	67076000000	USD
CY2020Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	61830000000	USD
CY2021Q4	us-gaap	Due To Affiliate Noncurrent DueToAffiliateNoncurrent	1494000000	USD
CY2020Q1	us-gaap	Payments For Proceeds From Hedge Investing Activities PaymentsForProceedsFromHedgeInvestingActivities	580000000	USD
CY2021Q4	us-gaap	Debt Instrument Unamortized Premium DebtInstrumentUnamortizedPremium	1740000000	USD
CY2020Q4	us-gaap	Debt Instrument Unamortized Premium DebtInstrumentUnamortizedPremium	2197000000	USD
CY2021Q4	us-gaap	Debt Instrument Unamortized Discount DebtInstrumentUnamortizedDiscount	200000000	USD
CY2020Q4	us-gaap	Debt Instrument Unamortized Discount DebtInstrumentUnamortizedDiscount	197000000	USD
CY2021Q4	us-gaap	Debt Issuance Costs Line Of Credit Arrangements Net DebtIssuanceCostsLineOfCreditArrangementsNet	238000000	USD
CY2020Q4	us-gaap	Debt Issuance Costs Line Of Credit Arrangements Net DebtIssuanceCostsLineOfCreditArrangementsNet	244000000	USD
CY2021Q4	us-gaap	Long Term Debt LongTermDebt	74193000000	USD
CY2020Q4	us-gaap	Long Term Debt LongTermDebt	71125000000	USD
CY2021Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	3378000000	USD
CY2021	tmus	Reimbursement Of Call Penalties ReimbursementOfCallPenalties	0	USD
CY2021	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-184000000	USD
CY2020	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-371000000	USD
CY2019	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-19000000	USD
CY2021Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	441000000	USD
CY2020Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	555000000	USD
CY2020Q4	us-gaap	Due To Affiliate Noncurrent DueToAffiliateNoncurrent	4716000000	USD
CY2021Q4	tmus	Longterm Debtand Longterm Debtto Affiliates LongtermDebtandLongtermDebttoAffiliates	68570000000	USD
CY2020Q4	tmus	Longterm Debtand Longterm Debtto Affiliates LongtermDebtandLongtermDebttoAffiliates	66546000000	USD
CY2021	us-gaap	Debt Instrument Interest Rate During Period DebtInstrumentInterestRateDuringPeriod	0.041
CY2020	us-gaap	Debt Instrument Interest Rate During Period DebtInstrumentInterestRateDuringPeriod	0.046
CY2021	tmus	Debt Instrument Average Amount Outstanding During Period DebtInstrumentAverageAmountOutstandingDuringPeriod	74000000000	USD
CY2020	tmus	Debt Instrument Average Amount Outstanding During Period DebtInstrumentAverageAmountOutstandingDuringPeriod	58400000000	USD
CY2021Q4	us-gaap	Debt Instrument Repurchased Face Amount DebtInstrumentRepurchasedFaceAmount	1234000000	USD
CY2021	tmus	Writeoffof Premiums Discountsand Issuance Costs WriteoffofPremiumsDiscountsandIssuanceCosts	0	USD
CY2021Q4	tmus	Minimum Lease Payments Failed Sale Leaseback Transaction Next Twelve Months MinimumLeasePaymentsFailedSaleLeasebackTransactionNextTwelveMonths	415000000	USD
CY2021Q4	tmus	Minimum Lease Payments Failed Sale Leaseback Transactions Within Two And Three Years MinimumLeasePaymentsFailedSaleLeasebackTransactionsWithinTwoAndThreeYears	630000000	USD
CY2021Q4	tmus	Minimum Lease Payments Failed Sale Leaseback Transactions Within Four And Five Years MinimumLeasePaymentsFailedSaleLeasebackTransactionsWithinFourAndFiveYears	626000000	USD
CY2021Q4	tmus	Minimum Lease Payments Failed Sale Leaseback Transactions Thereafter MinimumLeasePaymentsFailedSaleLeasebackTransactionsThereafter	329000000	USD
CY2020Q4	us-gaap	Contract With Customer Asset Net ContractWithCustomerAssetNet	278000000	USD
CY2020Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	824000000	USD
CY2021Q4	us-gaap	Contract With Customer Asset Net ContractWithCustomerAssetNet	286000000	USD
CY2021Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	763000000	USD
CY2021	us-gaap	Increase Decrease In Contract With Customer Asset IncreaseDecreaseInContractWithCustomerAsset	8000000	USD
CY2021	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	-61000000	USD
CY2021Q4	us-gaap	Contract With Customer Asset Net Current ContractWithCustomerAssetNetCurrent	219000000	USD
CY2020Q4	us-gaap	Contract With Customer Asset Net Current ContractWithCustomerAssetNetCurrent	204000000	USD
CY2021	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	767000000	USD
CY2020	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	545000000	USD
CY2019	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	643000000	USD
CY2021Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	1200000000	USD
CY2021Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	707000000	USD
CY2021Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	685000000	USD
CY2021Q4	us-gaap	Capitalized Contract Cost Net CapitalizedContractCostNet	1500000000	USD
CY2020Q4	us-gaap	Capitalized Contract Cost Net CapitalizedContractCostNet	1100000000	USD
CY2021Q4	us-gaap	Capitalized Contract Cost Amortization Period CapitalizedContractCostAmortizationPeriod	P24M
CY2021	us-gaap	Capitalized Contract Cost Amortization CapitalizedContractCostAmortization	1100000000	USD
CY2020	us-gaap	Capitalized Contract Cost Amortization CapitalizedContractCostAmortization	865000000	USD
CY2020	us-gaap	Capitalized Contract Cost Impairment Loss CapitalizedContractCostImpairmentLoss	0	USD
CY2021	us-gaap	Capitalized Contract Cost Impairment Loss CapitalizedContractCostImpairmentLoss	0	USD
CY2019	us-gaap	Capitalized Contract Cost Impairment Loss CapitalizedContractCostImpairmentLoss	0	USD
CY2021	tmus	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Adjustments ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdjustments	576866	shares
CY2021	tmus	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Performance Award Achievement Adjustments Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPerformanceAwardAchievementAdjustmentsWeightedAverageGrantDateFairValue	64.44
CY2021	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	316000000	USD
CY2020	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	439000000	USD
CY2019	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	156000000	USD
CY2021Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Maximum Employee Subscription Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate	0.15
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CY2021	tmus	Employee Stock Purchase Plan Offering Period EmployeeStockPurchasePlanOfferingPeriod	P6M
CY2021	tmus	Employee Stock Purchase Plans Number Of Securities Remaining For Future Sale And Issuance EmployeeStockPurchasePlansNumberOfSecuritiesRemainingForFutureSaleAndIssuance	7064316	shares
CY2021	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
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CY2021	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	0.04
CY2020	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	0.05
CY2021	tmus	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Actual Rate Of Return On Plan Assets During Period DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostActualRateOfReturnOnPlanAssetsDuringPeriod	0.08
CY2020	tmus	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Actual Rate Of Return On Plan Assets During Period DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostActualRateOfReturnOnPlanAssetsDuringPeriod	0.21
CY2021	tmus	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Rate Of Return On Investments In Next Fiscal Year DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermRateOfReturnOnInvestmentsInNextFiscalYear	0.05
CY2021	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	61000000	USD
CY2020	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	52000000	USD
CY2021	us-gaap	Defined Benefit Plan Expected Return On Plan Assets DefinedBenefitPlanExpectedReturnOnPlanAssets	56000000	USD
CY2020	us-gaap	Defined Benefit Plan Expected Return On Plan Assets DefinedBenefitPlanExpectedReturnOnPlanAssets	45000000	USD
CY2021	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	5000000	USD
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CY2021	tmus	Defined Benefit Plan Percent Of Portfolio Valued At Quoted Price DefinedBenefitPlanPercentOfPortfolioValuedAtQuotedPrice	0.14
CY2021	tmus	Defined Benefit Plan Percent Of Portfolio Valued Using Similar Assets In Active Or Inactive Markets DefinedBenefitPlanPercentOfPortfolioValuedUsingSimilarAssetsInActiveOrInactiveMarkets	0.81
CY2021	tmus	Defined Benefit Plan Percent Of Portfolio Valued Using Unobservable Inputs DefinedBenefitPlanPercentOfPortfolioValuedUsingUnobservableInputs	0.05
CY2020	tmus	Defined Benefit Plan Percent Of Portfolio Valued At Quoted Price DefinedBenefitPlanPercentOfPortfolioValuedAtQuotedPrice	0.12
CY2020	tmus	Defined Benefit Plan Percent Of Portfolio Valued Using Similar Assets In Active Or Inactive Markets DefinedBenefitPlanPercentOfPortfolioValuedUsingSimilarAssetsInActiveOrInactiveMarkets	0.85
CY2020	tmus	Defined Benefit Plan Percent Of Portfolio Valued Using Unobservable Inputs DefinedBenefitPlanPercentOfPortfolioValuedUsingUnobservableInputs	0.03
CY2021Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	1500000000	USD
CY2020Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	1400000000	USD
CY2021Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	2200000000	USD
CY2020Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	2300000000	USD
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CY2020Q4	us-gaap	Defined Benefit Plan Funded Status Of Plan DefinedBenefitPlanFundedStatusOfPlan	828000000	USD
CY2020Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate	0.03
CY2021Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate	0.03
CY2021	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	83000000	USD
CY2020	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	58000000	USD
CY2021Q4	us-gaap	Defined Benefit Plan Expected Future Employer Contributions Next Fiscal Year DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear	37000000	USD
CY2021Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Next Twelve Months DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths	100000000	USD
CY2021Q4	tmus	Defined Benefit Plan Expected Future Benefit Payment Years Two And Three DefinedBenefitPlanExpectedFutureBenefitPaymentYearsTwoAndThree	206000000	USD
CY2021Q4	tmus	Defined Benefit Plan Expected Future Benefit Payment Years Four And Five DefinedBenefitPlanExpectedFutureBenefitPaymentYearsFourAndFive	215000000	USD
CY2021Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Five Fiscal Years Thereafter DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter	562000000	USD
CY2021	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	190000000	USD
CY2020	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	179000000	USD
CY2019	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	119000000	USD
CY2020	us-gaap	Cash Provided By Used In Operating Activities Discontinued Operations CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations	611000000	USD
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	3401000000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	3493000000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	4557000000	USD
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	-50000000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	37000000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	46000000	USD
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	3351000000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	3530000000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	4603000000	USD
CY2021	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	22000000	USD
CY2020	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-17000000	USD
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-24000000	USD
CY2021	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	89000000	USD
CY2020	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	84000000	USD
CY2019	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	70000000	USD
CY2021	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	19000000	USD
CY2020	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	10000000	USD
CY2019	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	-2000000	USD
CY2021	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	130000000	USD
CY2020	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	77000000	USD
CY2019	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	44000000	USD
CY2021	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	541000000	USD
CY2020	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	676000000	USD
CY2019	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	954000000	USD
CY2021	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-327000000	USD
CY2020	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	34000000	USD
CY2019	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	125000000	USD
CY2021	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-17000000	USD
CY2020	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-1000000	USD
CY2019	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	12000000	USD
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	327000000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	786000000	USD
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	-0.026
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1135000000	USD
CY2021	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2020	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2019	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2021	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.045
CY2020	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.048
CY2019	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.051
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	-0.017
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	-0.008
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	0.004
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	-0.107
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	-0.018
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	0.001
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	0.003
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	0.003
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense EffectiveIncomeTaxRateReconciliationNondeductibleExpense	0.003
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense EffectiveIncomeTaxRateReconciliationNondeductibleExpense	0.004
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense EffectiveIncomeTaxRateReconciliationNondeductibleExpense	0.006
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits EffectiveIncomeTaxRateReconciliationTaxCredits	0.025
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits EffectiveIncomeTaxRateReconciliationTaxCredits	0.009
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits EffectiveIncomeTaxRateReconciliationTaxCredits	0.008
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	0.026
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	0.025
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	0.006
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Other EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther	0.015
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Other EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther	0.023
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Other EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther	0.006
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.001
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.003
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.001
CY2021	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.098
CY2020	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.223
CY2019	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.247
CY2021Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	4414000000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	4540000000	USD
CY2021Q4	tmus	Deferred Tax Assets Operating Lease Liability DeferredTaxAssetsOperatingLeaseLiability	7717000000	USD
CY2020Q4	tmus	Deferred Tax Assets Operating Lease Liability DeferredTaxAssetsOperatingLeaseLiability	8031000000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Property Plant And Equipment DeferredTaxAssetsPropertyPlantAndEquipment	0	USD
CY2020Q4	us-gaap	Deferred Tax Assets Property Plant And Equipment DeferredTaxAssetsPropertyPlantAndEquipment	90000000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals	1280000000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals	1348000000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	404000000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	411000000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	2888000000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	2665000000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	16703000000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	17085000000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	435000000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	878000000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	16268000000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	16207000000	USD
CY2021Q4	tmus	Deferred Tax Liabilities Goodwilland Intangible Assets Indefinite Lived Intangible Assets DeferredTaxLiabilitiesGoodwillandIntangibleAssetsIndefiniteLivedIntangibleAssets	18060000000	USD
CY2020Q4	tmus	Deferred Tax Liabilities Goodwilland Intangible Assets Indefinite Lived Intangible Assets DeferredTaxLiabilitiesGoodwillandIntangibleAssetsIndefiniteLivedIntangibleAssets	17518000000	USD
CY2021Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	380000000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	0	USD
CY2021Q4	tmus	Deferred Tax Liabilities Operating Lease Right Of Use Asset DeferredTaxLiabilitiesOperatingLeaseRightOfUseAsset	6761000000	USD
CY2020Q4	tmus	Deferred Tax Liabilities Operating Lease Right Of Use Asset DeferredTaxLiabilitiesOperatingLeaseRightOfUseAsset	7239000000	USD
CY2021Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	769000000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	912000000	USD
CY2021Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	514000000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	504000000	USD
CY2021Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	26484000000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	26173000000	USD
CY2021Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	10216000000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	9966000000	USD
CY2021Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	10216000000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	9966000000	USD
CY2021Q4	tmus	Unrecognized Tax Benefits Indirect Tax Effects Excluded UnrecognizedTaxBenefitsIndirectTaxEffectsExcluded	132000000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	435000000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	878000000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	129000000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1159000000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	514000000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	462000000	USD
CY2021	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	73000000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	6000000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2021	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	123000000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	28000000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2021	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	72000000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	45000000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	64000000	USD
CY2021	us-gaap	Unrecognized Tax Benefits Increases Resulting From Acquisition UnrecognizedTaxBenefitsIncreasesResultingFromAcquisition	36000000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Increases Resulting From Acquisition UnrecognizedTaxBenefitsIncreasesResultingFromAcquisition	624000000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Acquisition UnrecognizedTaxBenefitsIncreasesResultingFromAcquisition	0	USD
CY2021	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2020	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	2000000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	12000000	USD
CY2021Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1217000000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1159000000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	514000000	USD
CY2021Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	932000000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	857000000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	310000000	USD
CY2021	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	3024000000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	2744000000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	3468000000	USD
CY2021	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	0	USD
CY2020	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	320000000	USD
CY2019	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	0	USD
CY2021	us-gaap	Net Income Loss NetIncomeLoss	3024000000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	3064000000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	3468000000	USD
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	1247154988	shares
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	1144206326	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	854143751	shares
CY2021	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	7614938	shares
CY2020	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	10543102	shares
CY2019	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	9289760	shares
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	1254769926	shares
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	1154749428	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	863433511	shares
CY2021	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	2.42
CY2020	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	2.40
CY2019	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	4.06
CY2021	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0
CY2020	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.28
CY2019	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.42
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.68
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.06
CY2021	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	2.41
CY2020	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	2.37
CY2019	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	4.02
CY2021	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0
CY2020	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.28
CY2019	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.41
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.65
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.02
CY2021	tmus	Operating Lease Advance Payments OperatingLeaseAdvancePayments	1000000000	USD
CY2021	us-gaap	Operating Lease Expense OperatingLeaseExpense	5921000000	USD
CY2020	us-gaap	Operating Lease Expense OperatingLeaseExpense	4438000000	USD
CY2019	us-gaap	Operating Lease Expense OperatingLeaseExpense	2558000000	USD
CY2021	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	738000000	USD
CY2020	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	681000000	USD
CY2019	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	523000000	USD
CY2021	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	69000000	USD
CY2020	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	81000000	USD
CY2019	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	82000000	USD
CY2021	tmus	Finance Lease Expense FinanceLeaseExpense	807000000	USD
CY2020	tmus	Finance Lease Expense FinanceLeaseExpense	762000000	USD
CY2019	tmus	Finance Lease Expense FinanceLeaseExpense	605000000	USD
CY2021	us-gaap	Variable Lease Cost VariableLeaseCost	429000000	USD
CY2020	us-gaap	Variable Lease Cost VariableLeaseCost	328000000	USD
CY2019	us-gaap	Variable Lease Cost VariableLeaseCost	243000000	USD
CY2021	us-gaap	Lease Cost LeaseCost	7157000000	USD
CY2020	us-gaap	Lease Cost LeaseCost	5528000000	USD
CY2019	us-gaap	Lease Cost LeaseCost	3406000000	USD
CY2021Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P9Y
CY2020Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P10Y
CY2019Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P6Y
CY2021Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P3Y
CY2020Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P3Y
CY2019Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P3Y
CY2021Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.036
CY2020Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.039
CY2019Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.048
CY2021Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.025
CY2020Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.033
CY2019Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.040
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Rolling Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextRollingTwelveMonths	3868000000	USD
CY2021Q4	us-gaap	Finance Lease Liability Payments Due In Next Rolling Twelve Months FinanceLeaseLiabilityPaymentsDueInNextRollingTwelveMonths	1161000000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due In Rolling Year Two LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearTwo	4237000000	USD
CY2021Q4	us-gaap	Finance Lease Liability Payments Due In Rolling Year Two FinanceLeaseLiabilityPaymentsDueInRollingYearTwo	800000000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due In Rolling Year Three LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearThree	3846000000	USD
CY2021Q4	us-gaap	Finance Lease Liability Payments Due In Rolling Year Three FinanceLeaseLiabilityPaymentsDueInRollingYearThree	505000000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due In Rolling Year Four LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFour	3343000000	USD
CY2021Q4	us-gaap	Finance Lease Liability Payments Due In Rolling Year Four FinanceLeaseLiabilityPaymentsDueInRollingYearFour	128000000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due In Rolling Year Five LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFive	2971000000	USD
CY2021Q4	us-gaap	Finance Lease Liability Payments Due In Rolling Year Five FinanceLeaseLiabilityPaymentsDueInRollingYearFive	36000000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Rolling Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterRollingYearFive	17387000000	USD
CY2021Q4	us-gaap	Finance Lease Liability Payments Due In Rolling After Year Five FinanceLeaseLiabilityPaymentsDueInRollingAfterYearFive	29000000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	35652000000	USD
CY2021Q4	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	2659000000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	6409000000	USD
CY2021Q4	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	84000000	USD
CY2021Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	29243000000	USD
CY2021Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	2575000000	USD
CY2021	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	69000000	USD
CY2020	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	79000000	USD
CY2019	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	82000000	USD
CY2021Q4	tmus	Lessee Operating Lease Lease Notyet Commenced Payments Due LesseeOperatingLeaseLeaseNotyetCommencedPaymentsDue	98000000	USD
CY2021Q4	us-gaap	Lessor Operating Lease Payments To Be Received Next Rolling Twelve Months LessorOperatingLeasePaymentsToBeReceivedNextRollingTwelveMonths	402000000	USD
CY2021Q4	us-gaap	Lessor Operating Lease Payments To Be Received Rolling Year Two LessorOperatingLeasePaymentsToBeReceivedRollingYearTwo	44000000	USD
CY2021Q4	us-gaap	Lessor Operating Lease Payments To Be Received LessorOperatingLeasePaymentsToBeReceived	446000000	USD
CY2021Q4	tmus	Purchase Obligation Due In Next Rolling Twelve Months PurchaseObligationDueInNextRollingTwelveMonths	4700000000	USD
CY2021Q4	tmus	Purchase Obligation Due In Rolling Year Two And Three PurchaseObligationDueInRollingYearTwoAndThree	5600000000	USD
CY2021Q4	tmus	Purchase Obligation Due In Rolling Year Four And Five PurchaseObligationDueInRollingYearFourAndFive	2100000000	USD
CY2021Q4	tmus	Purchase Obligation Due In Rolling After Year Five PurchaseObligationDueInRollingAfterYearFive	1600000000	USD
CY2021Q4	tmus	Lease And Service Credit Commitment Due In Next Rolling Twelve Months LeaseAndServiceCreditCommitmentDueInNextRollingTwelveMonths	350000000	USD
CY2021Q4	tmus	Lease And Service Credit Commitment Due In Rolling Year Two And Three LeaseAndServiceCreditCommitmentDueInRollingYearTwoAndThree	611000000	USD
CY2021Q4	tmus	Lease And Service Credit Commitment Due In Rolling Year Four And Five LeaseAndServiceCreditCommitmentDueInRollingYearFourAndFive	591000000	USD
CY2021Q4	tmus	Lease And Service Credit Commitment Due In Rolling After Year Five LeaseAndServiceCreditCommitmentDueInRollingAfterYearFive	4700000000	USD
CY2021Q4	tmus	Lease And Service Credit Commitment Maximum Remaining Commitment LeaseAndServiceCreditCommitmentMaximumRemainingCommitment	85000000	USD
CY2021Q4	tmus	Merger Commitment Settlement Due In Next Rolling Twelve Months MergerCommitmentSettlementDueInNextRollingTwelveMonths	11000000	USD
CY2021Q4	tmus	Merger Commitment Settlement Due In Rolling Year Two And Three MergerCommitmentSettlementDueInRollingYearTwoAndThree	12000000	USD
CY2020	us-gaap	Restructuring Charges RestructuringCharges	1060000000	USD
CY2021	us-gaap	Restructuring Charges RestructuringCharges	215000000	USD
CY2021Q4	us-gaap	Restructuring And Related Cost Cost Incurred To Date1 RestructuringAndRelatedCostCostIncurredToDate1	1275000000	USD
CY2021	us-gaap	Operating Lease Right Of Use Asset Amortization Expense OperatingLeaseRightOfUseAssetAmortizationExpense	873000000	USD
CY2020	us-gaap	Operating Lease Right Of Use Asset Amortization Expense OperatingLeaseRightOfUseAssetAmortizationExpense	153000000	USD
CY2020Q4	us-gaap	Restructuring Reserve RestructuringReserve	163000000	USD
CY2021	us-gaap	Restructuring Charges RestructuringCharges	215000000	USD
CY2021	us-gaap	Payments For Restructuring PaymentsForRestructuring	251000000	USD
CY2021	us-gaap	Restructuring Reserve Accrual Adjustment1 RestructuringReserveAccrualAdjustment1	-41000000	USD
CY2021Q4	us-gaap	Restructuring Reserve RestructuringReserve	86000000	USD
CY2021	tmus	Restructuring Term RestructuringTerm	P2Y
CY2021Q4	us-gaap	Accounts Payable Trade Current AccountsPayableTradeCurrent	6499000000	USD
CY2020Q4	us-gaap	Accounts Payable Trade Current AccountsPayableTradeCurrent	5564000000	USD
CY2021Q4	us-gaap	Accrual For Taxes Other Than Income Taxes Current AccrualForTaxesOtherThanIncomeTaxesCurrent	1343000000	USD
CY2020Q4	us-gaap	Accrual For Taxes Other Than Income Taxes Current AccrualForTaxesOtherThanIncomeTaxesCurrent	1163000000	USD
CY2021Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	1830000000	USD
CY2020Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	1540000000	USD
CY2021Q4	us-gaap	Interest Payable Current InterestPayableCurrent	710000000	USD
CY2020Q4	us-gaap	Interest Payable Current InterestPayableCurrent	771000000	USD
CY2021Q4	us-gaap	Accrued Sales Commission Current AccruedSalesCommissionCurrent	348000000	USD
CY2020Q4	us-gaap	Accrued Sales Commission Current AccruedSalesCommissionCurrent	399000000	USD
CY2021Q4	tmus	Accrued Liabilities Toll And Interconnect AccruedLiabilitiesTollAndInterconnect	248000000	USD
CY2020Q4	tmus	Accrued Liabilities Toll And Interconnect AccruedLiabilitiesTollAndInterconnect	217000000	USD
CY2021Q4	us-gaap	Accrued Advertising Current AccruedAdvertisingCurrent	59000000	USD
CY2020Q4	us-gaap	Accrued Advertising Current AccruedAdvertisingCurrent	135000000	USD
CY2021Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	368000000	USD
CY2020Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	407000000	USD
CY2021Q4	us-gaap	Accounts Payable And Accrued Liabilities Current AccountsPayableAndAccruedLiabilitiesCurrent	11405000000	USD
CY2020Q4	us-gaap	Accounts Payable And Accrued Liabilities Current AccountsPayableAndAccruedLiabilitiesCurrent	10196000000	USD
CY2021	us-gaap	Interest Paid Net InterestPaidNet	3723000000	USD
CY2020	us-gaap	Interest Paid Net InterestPaidNet	2733000000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	1128000000	USD
CY2021	us-gaap	Operating Lease Payments OperatingLeasePayments	6248000000	USD
CY2020	us-gaap	Operating Lease Payments OperatingLeasePayments	4619000000	USD
CY2019	us-gaap	Operating Lease Payments OperatingLeasePayments	2783000000	USD
CY2021	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	167000000	USD
CY2020	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	218000000	USD
CY2019	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	88000000	USD
CY2021	us-gaap	Consideration Received For Beneficial Interest Obtained For Transferring Financial Asset ConsiderationReceivedForBeneficialInterestObtainedForTransferringFinancialAsset	4237000000	USD
CY2020	us-gaap	Consideration Received For Beneficial Interest Obtained For Transferring Financial Asset ConsiderationReceivedForBeneficialInterestObtainedForTransferringFinancialAsset	6194000000	USD
CY2019	us-gaap	Consideration Received For Beneficial Interest Obtained For Transferring Financial Asset ConsiderationReceivedForBeneficialInterestObtainedForTransferringFinancialAsset	6509000000	USD
CY2021	tmus	Noncash Or Part Noncash Acquisition Consideration NoncashOrPartNoncashAcquisitionConsideration	0	USD
CY2020	tmus	Noncash Or Part Noncash Acquisition Consideration NoncashOrPartNoncashAcquisitionConsideration	33533000000	USD
CY2019	tmus	Noncash Or Part Noncash Acquisition Consideration NoncashOrPartNoncashAcquisitionConsideration	0	USD
CY2021	tmus	Change In Capital Expenditures Incurred But Not Yet Paid ChangeInCapitalExpendituresIncurredButNotYetPaid	-366000000	USD
CY2020	tmus	Change In Capital Expenditures Incurred But Not Yet Paid ChangeInCapitalExpendituresIncurredButNotYetPaid	-589000000	USD
CY2019	tmus	Change In Capital Expenditures Incurred But Not Yet Paid ChangeInCapitalExpendituresIncurredButNotYetPaid	935000000	USD
CY2021	us-gaap	Noncash Or Part Noncash Acquisition Fixed Assets Acquired1 NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1	1198000000	USD
CY2020	us-gaap	Noncash Or Part Noncash Acquisition Fixed Assets Acquired1 NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1	2795000000	USD
CY2019	us-gaap	Noncash Or Part Noncash Acquisition Fixed Assets Acquired1 NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1	1006000000	USD
CY2021	us-gaap	Noncash Or Part Noncash Acquisition Inventory Acquired1 NoncashOrPartNoncashAcquisitionInventoryAcquired1	1437000000	USD
CY2020	us-gaap	Noncash Or Part Noncash Acquisition Inventory Acquired1 NoncashOrPartNoncashAcquisitionInventoryAcquired1	1460000000	USD
CY2019	us-gaap	Noncash Or Part Noncash Acquisition Inventory Acquired1 NoncashOrPartNoncashAcquisitionInventoryAcquired1	267000000	USD
CY2021	us-gaap	Noncash Or Part Noncash Acquisition Debt Assumed1 NoncashOrPartNoncashAcquisitionDebtAssumed1	0	USD
CY2020	us-gaap	Noncash Or Part Noncash Acquisition Debt Assumed1 NoncashOrPartNoncashAcquisitionDebtAssumed1	38000000	USD
CY2019	us-gaap	Noncash Or Part Noncash Acquisition Debt Assumed1 NoncashOrPartNoncashAcquisitionDebtAssumed1	800000000	USD
CY2021	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	3773000000	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	14129000000	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	3621000000	USD
CY2021	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	1261000000	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	1273000000	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	1041000000	USD
CY2021	dei	Auditor Firm AuditorFirmId	238

Files In Submission

Name	View Source	Status
0001283699-22-000018-index-headers.html	Edgar Link	pending
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0001283699-22-000018.txt	Edgar Link	pending
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tmus12312021ex475.htm	Edgar Link	pending

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

2021 Q4 Form 10-K Financial Statement

#000128369922000018 Filed on February 11, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

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

2021 Q4 Form 10-K Financial Statement

#000128369922000018 Filed on February 11, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

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