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Device Payment Plan Agreement and Wireless Service Receivables - Schedule of Receivables (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Financing Receivable, after Allowance for Credit Loss, Current [Abstract] |  |
Accounts receivable, net | $ 14,998 | $ 15,141
Accounts and Financing Receivable, after Allowance for Credit Loss, Current [Abstract] |  |
Accounts receivable | 27,083 | 27,261
Less Allowance for credit losses | 1,163 | 1,152
Accounts receivable, net | 25,920 | $ 26,109
Device payment plan agreement |  |
Financing Receivable, after Allowance for Credit Loss, Current [Abstract] |  |
Accounts receivable | 15,738 |
Less Allowance for credit losses | 740 |
Accounts receivable, net | 14,998 |
Wireless service |  |
Accounts Receivable, after Allowance for Credit Loss, Current [Abstract] |  |
Accounts receivable | 6,123 |
Less Allowance for credit losses | 242 |
Accounts receivable, net | 5,881 |
Other receivables |  |
Accounts Receivable, after Allowance for Credit Loss, Current [Abstract] |  |
Accounts receivable | 5,222 |
Less Allowance for credit losses | 181 |
Accounts receivable, net | $ 5,041 |

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