| Document and Entity Information | Feb. 18, 2025 |
| Document And Entity Information [Line Items] | |
| Entity Incorporation State Country Code | DE |
| Amendment Flag | false |
| Entity Central Index Key | 0001283699 |
| Document Type | 8-K |
| Document Period End Date | Feb. 18, 2025 |
| Entity Registrant Name | T-MOBILE US, INC. |
| 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 |
| Common Stock Par Value 0.00001 Per Share [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Common Stock, $0.00001 par value per share |
| Trading Symbol | TMUS |
| Security Exchange Name | NASDAQ |
| A 3.550 Senior Notes Due 2029 [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | 3.550% Senior Notes due 2029 |
| Trading Symbol | TMUS29 |
| Security Exchange Name | NASDAQ |
| M 3.700 Senior Notes Due 20322 [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | 3.700% Senior Notes due 2032 |
| Trading Symbol | TMUS32 |
| Security Exchange Name | NASDAQ |
| M 3.150 Senior Notes Due 20321 [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | 3.150% Senior Notes due 2032 |
| Trading Symbol | TMUS32A |
| Security Exchange Name | NASDAQ |
| M 3.850 Senior Notes Due 20365 [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | 3.850% Senior Notes due 2036 |
| Trading Symbol | TMUS36 |
| Security Exchange Name | NASDAQ |
| M 3.500 Senior Notes Due 20373 [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | 3.500% Senior Notes due 2037 |
| Trading Symbol | TMUS37 |
| Security Exchange Name | NASDAQ |
| M 3.800 Senior Notes Due 20454 [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | 3.800% Senior Notes due 2045 |
| Trading Symbol | TMUS45 |
| Security Exchange Name | NASDAQ |
