Cover Page	Jul. 23, 2025
Cover [Abstract]
Document Type	8-K
Document Period End Date	Jul. 23, 2025
Entity Registrant Name	T-MOBILE US, INC.
Entity Incorporation, State or Country Code	DE
Entity File Number	1-33409
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
Written Communications	false
Soliciting Material	false
Pre-commencement Tender Offer	false
Pre-commencement Issuer Tender Offer	false
Entity Emerging Growth Company	false
Entity Central Index Key	0001283699
Amendment Flag	false
Common Stock, Par Value $0.00001 Per Share
Cover [Abstract]
Title of 12(b) Security	Common Stock, par value $0.00001 per share
Trading Symbol	TMUS
Security Exchange Name	NASDAQ
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
Cover [Abstract]
Title of 12(b) Security	3.550% Senior Notes due 2029
Trading Symbol	TMUS29
Security Exchange Name	NASDAQ
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
Cover [Abstract]
Title of 12(b) Security	3.700% Senior Notes due 2032
Trading Symbol	TMUS32
Security Exchange Name	NASDAQ
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
Cover [Abstract]
Title of 12(b) Security	3.150% Senior Notes due 2032
Trading Symbol	TMUS32A
Security Exchange Name	NASDAQ
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
Cover [Abstract]
Title of 12(b) Security	3.850% Senior Notes due 2036
Trading Symbol	TMUS36
Security Exchange Name	NASDAQ
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
Cover [Abstract]
Title of 12(b) Security	3.500% Senior Notes due 2037
Trading Symbol	TMUS37
Security Exchange Name	NASDAQ
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
Cover [Abstract]
Title of 12(b) Security	3.800% Senior Notes due 2045
Trading Symbol	TMUS45
Security Exchange Name	NASDAQ
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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