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Equipment Installment Plans - Allowance for Credit Losses (Details) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024
Allowance for credit losses |  |
Allowance for credit losses, beginning of period | $ 82 |
Allowance for credit losses, end of period | 75 |
Equipment Installment Plan Receivable |  |
Allowance for credit losses |  |
Write-offs, net of recoveries, originated in 2022 | 2 |
Write-offs, net of recoveries, originated in 2023 | 8 |
Write-offs, net of recoveries, originated in 2024 | 26 |
Write-offs, net of recoveries, originated in 2025 | 1 |
Write-offs, net of recoveries, Total | 37 | $ 38
Allowance for credit losses, beginning of period | 82 | 90
Bad debts expense | 30 | 33
Write-offs, net of recoveries | (37) | (38)
Allowance for credit losses, end of period | $ 75 | $ 85

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