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Equipment Installment Plans - Allowance for Credit Losses (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Allowance for credit losses |  |
Allowance for credit losses, beginning of period | $ 96 |
Allowance for credit losses, end of period | 94 |
Equipment Installment Plan Receivable |  |
Allowance for credit losses |  |
Write-offs, net of recoveries, originated in 2021 | 6 |
Write-offs, net of recoveries, originated in 2022 | 14 |
Write-offs, net of recoveries, originated in 2023 | 0 |
Write-offs, net of recoveries, Total | 20 | $ 16
Allowance for credit losses, beginning of period | 96 | 72
Bad debts expense | 18 | 17
Write-offs, net of recoveries | (20) | (16)
Allowance for credit losses, end of period | $ 94 | $ 73

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- Definition Amount of writeoff of financing receivable originated two years prior to current fiscal year, charged against allowance for credit loss. + References No definition available. + Details
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