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Equipment Installment Plans - Allowance for Credit Losses (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Allowance for credit losses |  |
Allowance for credit losses, beginning of year | $ 96 |
Allowance for credit losses, end of year | 90 | $ 96
Equipment Installment Plan Receivable |  |
Allowance for credit losses |  |
Write-offs, net of recoveries, originated in 2021 | 13 |
Write-offs, net of recoveries, originated in 2022 | 45 |
Write-offs, net of recoveries, originated in 2023 | 17 |
Write-offs, net of recoveries, Total | 75 | 76
Allowance for credit losses, beginning of year | 96 | 72
Bad debts expense | 69 | 100
Write-offs, net of recoveries | (75) | (76)
Allowance for credit losses, end of year | $ 90 | $ 96

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