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Equipment Installment Plans - EIP Receivables (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Equipment installment plan receivables, gross | $ 1,101 | $ 1,151
Allowance for credit losses | (85) | (90)
Equipment installment plan receivables, net | 1,016 | 1,061
Accounts receivable — Customers and agents (Current portion) |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Equipment installment plan receivables, net | 578 | 577
Other assets and deferred charges (Non-current portion) |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Equipment installment plan receivables, net | $ 438 | $ 484

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