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Equipment Installment Plans - EIP Receivables (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Equipment installment plan receivables, gross | $ 1,127 | $ 1,211
Allowance for credit losses | (85) | (96)
Equipment installment plan receivables, net | 1,042 | 1,115
Accounts receivable — Customers and agents (Current portion) |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Equipment installment plan receivables, net | 581 | 646
Other assets and deferred charges (Non-current portion) |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Equipment installment plan receivables, net | $ 461 | $ 469

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