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Equipment Installment Plans - EIP Receivables (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Equipment installment plan receivables, gross | $ 951 | $ 1,008
Allowance for credit losses | (75) | (84)
Equipment installment plan receivables, net | 876 | 924
Accounts receivable — Customers and agents (Current portion) |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Equipment installment plan receivables, net | 568 | 587
Other assets and deferred charges (Non-current portion) |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Equipment installment plan receivables, net | $ 308 | $ 337

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