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