Additional Financial Information (Tables)
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12 Months Ended |
Dec. 31, 2025 |
| Supplemental Financial Statement Elements [Abstract] |
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| Schedule of Accounts Payable and Accrued Liabilities |
Accounts payable and accrued liabilities are summarized as follows: | | | | | | | | | | | | | (in millions) | December 31, 2025 | | December 31, 2024 | | Accounts payable | $ | 5,219 | | | $ | 4,242 | | | Payroll and related benefits | 1,709 | | | 1,072 | | | Property and other taxes, including payroll | 1,601 | | | 1,524 | | | Accrued interest | 1,025 | | | 905 | | | | | | | | | | | | | | | | | | | Other accrued liabilities | 726 | | | 720 | | | Accounts payable and accrued liabilities | $ | 10,280 | | | $ | 8,463 | | | | | |
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| Schedule of Related Party Transactions |
The following table summarizes the impact of significant transactions with DT or its affiliates included in Operating expenses in the Consolidated Statements of Comprehensive Income: | | | | | | | | | | | | | | | | | | | | | | | | | Year Ended December 31, | | (in millions) | | | | | 2025 | | 2024 | | 2023 | | | | | | | | | | | | Fees incurred for use of the T-Mobile brand | | | | | $ | 80 | | | $ | 80 | | | $ | 80 | | | | | | | | | | | | | International long distance agreement | | | | | 14 | | | 19 | | | 20 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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| Schedule of Supplemental Consolidated Statements of Cash Flows Information |
Income taxes paid, net of refunds received, were as follows: | | | | | | | | | | | | | | | | | | | Year Ended December 31, | | (in millions) | 2025 | | 2024 | | 2023 | | Federal | $ | 97 | | | $ | 113 | | | $ | 10 | | | State & local | | | | | | | Texas | 34 | | | 27 | | | 26 | | | Illinois | 42 | | | NM | | 18 | | | California | 190 | | | (10) | | | (10) | | | Other | 65 | | | 40 | | | 26 | | | Total state & local | 331 | | | 57 | | | 60 | | | Foreign | | | | | | | Puerto Rico | NM | | NM | | 35 | | | Other | 23 | | | 9 | | | 3 | | | Total foreign | 23 | | | 9 | | | 38 | | | Total income taxes paid, net | $ | 451 | | | $ | 179 | | | $ | 108 | |
NM - Not meaningful, the amount of income taxes paid does not meet the 5% disaggregation threshold for reporting. The following table summarizes T-Mobile’s supplemental cash flow information: | | | | | | | | | | | | | | | | | | | | | | | | | Year Ended December 31, | | (in millions) | | | | | 2025 | | 2024 | | 2023 | | Interest payments, net of amounts capitalized | | | | | $ | 3,882 | | | $ | 3,683 | | | $ | 3,546 | | | Operating lease payments | | | | | 4,764 | | | 5,162 | | | 5,062 | | | Income tax payments, net of refunds received | | | | | 451 | | | 179 | | | 108 | | | Non-cash investing and financing activities | | | | | | | | | | | | | | | | | | | | | Non-cash beneficial interest obtained in exchange for securitized receivables | | | | | $ | — | | | $ | 2,421 | | | $ | 3,990 | | | | | | | | | | | | | Change in accounts payable and accrued liabilities for purchases of property and equipment | | | | | (227) | | | 105 | | | (860) | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Operating lease right-of-use assets obtained in exchange for lease obligations | | | | | 2,728 | | | 1,741 | | | 2,141 | | | Financing lease right-of-use assets obtained in exchange for lease obligations | | | | | 1,232 | | | 1,222 | | | 1,224 | | | Deferred consideration related to the Ka’ena Acquisition | | | | | — | | | 218 | | | — | | | Debt assumed in the UScellular Acquisition | | | | | 1,653 | | | — | | | — | |
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| Schedule of Cash and Cash Equivalents, Including Restricted Cash |
Cash and cash equivalents, including restricted cash, presented on our Consolidated Statements of Cash Flows were included on our Consolidated Balance Sheets as follows: | | | | | | | | | | | | | (in millions) | December 31, 2025 | | December 31, 2024 | | Cash and cash equivalents | $ | 5,598 | | | $ | 5,409 | | | | | | | Restricted cash (included in Other current assets) | 296 | | | 231 | | | Restricted cash (included in Other assets) | 82 | | | 73 | | | Cash and cash equivalents, including restricted cash | $ | 5,976 | | | $ | 5,713 | |
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| Schedule of Restricted Cash |
Cash and cash equivalents, including restricted cash, presented on our Consolidated Statements of Cash Flows were included on our Consolidated Balance Sheets as follows: | | | | | | | | | | | | | (in millions) | December 31, 2025 | | December 31, 2024 | | Cash and cash equivalents | $ | 5,598 | | | $ | 5,409 | | | | | | | Restricted cash (included in Other current assets) | 296 | | | 231 | | | Restricted cash (included in Other assets) | 82 | | | 73 | | | Cash and cash equivalents, including restricted cash | $ | 5,976 | | | $ | 5,713 | |
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