Cover Page - shares	6 Months Ended
Jun. 30, 2025	Jul. 18, 2025
Entity Listings [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2025
Document Transition Report	false
Entity File Number	1-33409
Entity Registrant Name	T-MOBILE US, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	20-0836269
Entity Address, Address Line One	12920 SE 38th Street
Entity Address, City or Town	Bellevue
Entity Address, State or Province	WA
Entity Address, Postal Zip Code	98006-1350
City Area Code	(425)
Local Phone Number	378-4000
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding (in shares)		1,125,419,038
Entity Central Index Key	0001283699
Amendment Flag	false
Document Fiscal Year Focus	2025
Document Fiscal Period Focus	Q2
Current Fiscal Year End Date	--12-31
Common Stock, par value $0.00001 per share
Entity Listings [Line Items]
Title of 12(b) Security	Common Stock, par value $0.00001 per share
Trading Symbol	TMUS
Security Exchange Name	NASDAQ
3.550% Senior Notes due 2029
Entity Listings [Line Items]
Title of 12(b) Security	3.550% Senior Notes due 2029
Trading Symbol	TMUS29
Security Exchange Name	NASDAQ
3.700% Senior Notes due 2032
Entity Listings [Line Items]
Title of 12(b) Security	3.700% Senior Notes due 2032
Trading Symbol	TMUS32
Security Exchange Name	NASDAQ
3.150% Senior Notes due 2032
Entity Listings [Line Items]
Title of 12(b) Security	3.150% Senior Notes due 2032
Trading Symbol	TMUS32A
Security Exchange Name	NASDAQ
3.850% Senior Notes due 2036
Entity Listings [Line Items]
Title of 12(b) Security	3.850% Senior Notes due 2036
Trading Symbol	TMUS36
Security Exchange Name	NASDAQ
3.500% Senior Notes due 2037
Entity Listings [Line Items]
Title of 12(b) Security	3.500% Senior Notes due 2037
Trading Symbol	TMUS37
Security Exchange Name	NASDAQ
3.800% Senior Notes due 2045
Entity Listings [Line Items]
Title of 12(b) Security	3.800% Senior Notes due 2045
Trading Symbol	TMUS45
Security Exchange Name	NASDAQ

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