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Equipment Installment Plans - EIP Receivables (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Equipment installment plan receivables, gross | $ 975 | $ 974
Allowance for credit losses | (82) | (77)
Equipment installment plan receivables, net | 893 | 897
Accounts receivable — Customers and agents (Current portion) |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Equipment installment plan receivables, net | 574 | 560
Other assets and deferred charges (Non-current portion) |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Equipment installment plan receivables, net | $ 319 | $ 337

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