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Equipment Installment Plans - Allowance for Credit Losses (Details) - USD ($)
$ in Millions
 6 Months Ended
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