Receivables and Related Allowance for Credit Losses - Schedule of Equipment Installment Plan Receivables (Details) - USD ($) $ in Millions |
Jun. 30, 2026 |
Dec. 31, 2025 |
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| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| EIP receivables, gross | $ 8,130 | $ 8,626 |
| Unamortized imputed discount | (551) | (566) |
| EIP receivables, net of unamortized imputed discount | 7,579 | 8,060 |
| Allowance for credit losses | (406) | (380) |
| EIP receivables, net of allowance for credit losses and imputed discount | 7,173 | 7,680 |
| Balance Sheet Location [Axis]: us-gaap:NotesAndLoansReceivableNetCurrent | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| EIP receivables, net of allowance for credit losses and imputed discount | 4,715 | 4,997 |
| Balance Sheet Location [Axis]: us-gaap:NotesAndLoansReceivableNetNoncurrent | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| EIP receivables, net of allowance for credit losses and imputed discount | $ 2,458 | $ 2,683 |
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amortized cost, before allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amortized cost, after allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Disclosure of the unamortized amount of the discount on the note or receivable which is deducted from the face amount of the receivable or loan. The discount or premium is the difference between the present value and the face amount. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition The receivable or note face amount less the unamortized discount or premium. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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