Stock Repurchased and Retired During Period, Average Cost Per Share

No definition available.

Name:	tmus_StockRepurchasedandRetiredDuringPeriodAverageCostPerShare
Namespace Prefix:	tmus_
Data Type:	dtr-types1:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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-Topic 835
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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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-SubTopic 10
-Name Accounting Standards Codification
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Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References

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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References

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-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-SubTopic 10
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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 830
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481674/830-30-50-2

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Period Type:	duration

- Details

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Balance Type:
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- Details

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- Details

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Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=tmus_ASeniorClassMember
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Period Type:

- Details

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- Details

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Subsequent Events (Details) - USD ($)	1 Months Ended	3 Months Ended		9 Months Ended
Subsequent Events (Details) - USD ($)	Oct. 18, 2024	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Oct. 11, 2024	Oct. 09, 2024	Feb. 14, 2024
Subsequent Event [Line Items]
Purchase price		$ 650,000,000	$ 2,702,000,000	$ 6,543,000,000	$ 11,073,000,000
2023-2024 Stockholder Return Program
Subsequent Event [Line Items]
Repurchases of common stock (in shares)		3,179,707		39,093,340
Average price paid per share (in USD per share)		$ 202.45		$ 165.98
Purchase price		$ 644,000,000		$ 6,500,000,000
2023-2024 Stockholder Return Program \| Subsequent Event
Subsequent Event [Line Items]
Repurchases of common stock (in shares)	4,186,019
Average price paid per share (in USD per share)	$ 212.88
Purchase price	$ 891,000,000
Senior Notes
Subsequent Event [Line Items]
Principal Issuances		$ 7,650,000,000		$ 7,650,000,000
A Senior Class \| ABS Notes
Subsequent Event [Line Items]
Principal Issuances								$ 500,000,000
Interest rate, stated percentage								5.05%
A Senior Class \| ABS Notes \| Subsequent Event
Subsequent Event [Line Items]
Principal Issuances							$ 500,000,000
Interest rate, stated percentage							4.25%
7.625% Senior Notes due 2025 \| Senior Notes \| Subsequent Event
Subsequent Event [Line Items]
Principal Issuances						$ 1,500,000,000
Interest rate, stated percentage						7.625%