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Equipment Installment Plans - EIP Receivables (Details) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Equipment installment plan receivables, gross | $ 1,074 | $ 1,085
Allowance for credit losses | (74) | (72)
Equipment installment plan receivables, net | 1,000 | 1,013
Accounts receivable — Customers and agents (Current portion) |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Equipment installment plan receivables, net | 631 | 639
Other assets and deferred charges (Non-current portion) |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Equipment installment plan receivables, net | $ 369 | $ 374

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