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Equipment Installment Plans - Allowance for Credit Losses (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Allowance for credit losses |  |
Allowance for credit losses, beginning of year | $ 90 |
Allowance for credit losses, end of year | 82 | $ 90
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 | 18 |
Write-offs, net of recoveries, originated in 2023 | 40 |
Write-offs, net of recoveries, originated in 2024 | 16 |
Write-offs, net of recoveries | 73 | 75
Allowance for credit losses, beginning of year | 90 | 96
Bad debts expense | 65 | 69
Write-offs, net of recoveries | (73) | (75)
Allowance for credit losses, end of year | $ 82 | $ 90

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