Device Payment Plan Agreement and Wireless Service Receivables - Allowance for Credit Losses (Detail) $ in Millions |
12 Months Ended |
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Dec. 31, 2025
USD ($)
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| Financing Receivable, Allowance for Credit Loss [Roll Forward] | |
| Beginning balance | $ 1,315 |
| Ending balance | 1,628 |
| Device payment plan agreement | |
| Financing Receivable, Allowance for Credit Loss [Roll Forward] | |
| Beginning balance | 1,315 |
| Current period provision for expected credit losses | 1,622 |
| Write-offs charged against the allowance | (1,356) |
| Recoveries collected | 47 |
| Ending balance | 1,628 |
| Wireless service | |
| Financing Receivable, Allowance for Credit Loss [Roll Forward] | |
| Beginning balance | 240 |
| Current period provision for expected credit losses | 492 |
| Write-offs charged against the allowance | (540) |
| Recoveries collected | 52 |
| Ending balance | $ 244 |
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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 Amount of increase in allowance for credit loss on financing receivable from recovery. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available.
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- Definition Amount of writeoff of financing receivable, charged against allowance for credit loss. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of credit loss expense (reversal of expense) for financing receivable. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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