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Equipment Installment Plans - Allowance for Credit Losses (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Allowance for credit losses    
Allowance for credit losses, beginning of period $ 90  
Allowance for credit losses, end of period 80  
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 15  
Write-offs, net of recoveries, originated in 2023 34  
Write-offs, net of recoveries, originated in 2024 6  
Write-offs, net of recoveries, Total 54 $ 58
Allowance for credit losses, beginning of period 90 96
Bad debts expense 44 47
Write-offs, net of recoveries (54) (58)
Allowance for credit losses, end of period $ 80 $ 85