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Equipment Installment Plans - Allowance for Credit Losses (Details) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2024 | Jun. 30, 2023
Allowance for credit losses |  |
Allowance for credit losses, beginning of period | $ 90 |
Allowance for credit losses, end of period | 85 |
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 | 13 |
Write-offs, net of recoveries, originated in 2023 | 25 |
Write-offs, net of recoveries, originated in 2024 | 1 |
Write-offs, net of recoveries, Total | 38 | $ 39
Allowance for credit losses, beginning of period | 90 | 96
Bad debts expense | 33 | 35
Write-offs, net of recoveries | (38) | (39)
Allowance for credit losses, end of period | $ 85 | $ 92

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