Device Payment Plan Agreement and Wireless Service Receivables - Allowance for Credit Losses (Detail) $ in Millions |
9 Months Ended |
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Sep. 30, 2026
USD ($)
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| Financing Receivable, Allowance for Credit Loss [Roll Forward] | |
| Beginning balance | $ 1,628 |
| Ending balance | 1,510 |
| Device payment plan agreement | |
| Financing Receivable, Allowance for Credit Loss [Roll Forward] | |
| Beginning balance | 1,628 |
| Current period provision for expected credit losses | 900 |
| Write-offs charged against the allowance | (1,069) |
| Recoveries collected | 51 |
| Ending balance | 1,510 |
| Wireless Service Plan Receivables | |
| Financing Receivable, Allowance for Credit Loss [Roll Forward] | |
| Beginning balance | 244 |
| Current period provision for expected credit losses | 392 |
| Write-offs charged against the allowance | (429) |
| Recoveries collected | 41 |
| Ending balance | $ 248 |
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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/exampleRef
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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/exampleRef
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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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