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Equipment Installment Plans - Allowance for Credit Losses (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Allowance for credit losses    
Allowance for credit losses, beginning of period $ 96  
Allowance for credit losses, end of period 85  
Equipment Installment Plan Receivable    
Allowance for credit losses    
Write-offs, net of recoveries, originated in 2021 12  
Write-offs, net of recoveries, originated in 2022 38  
Write-offs, net of recoveries, originated in 2023 8  
Write-offs, net of recoveries, Total 58 $ 54
Allowance for credit losses, beginning of period 96 72
Bad debts expense 47 69
Write-offs, net of recoveries (58) (54)
Allowance for credit losses, end of period $ 85 $ 87