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Equipment Installment Plans - EIP Receivables (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Equipment installment plan receivables, gross | $ 1,022 | $ 1,007
Allowance for credit losses | (70) | (78)
Equipment installment plan receivables, net | 952 | 929
Accounts receivable — Customers and agents (Current portion) |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Equipment installment plan receivables, net | 607 | 590
Other assets and deferred charges (Non-current portion) |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Equipment installment plan receivables, net | $ 345 | $ 339

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