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Equipment Installment Plans - Allowance for Credit Losses (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Allowance for credit losses |  |
Allowance for credit losses, beginning of period | $ 90 |
Allowance for credit losses, end of period | 88 |
Equipment Installment Plan Receivable |  |
Allowance for credit losses |  |
Write-offs, net of recoveries, originated in 2021 | 1 |
Write-offs, net of recoveries, originated in 2022 | 8 |
Write-offs, net of recoveries, originated in 2023 | 15 |
Write-offs, net of recoveries, Total | 24 | $ 20
Allowance for credit losses, beginning of period | 90 | 96
Bad debts expense | 22 | 18
Write-offs, net of recoveries | (24) | (20)
Allowance for credit losses, end of period | $ 88 | $ 94

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