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Equipment Installment Plans - Allowance for Credit Losses (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Allowance for credit losses    
Allowance for credit losses, beginning of period $ 90  
Allowance for credit losses, end of period 88  
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 8  
Write-offs, net of recoveries, originated in 2023 15  
Write-offs, net of recoveries, Total 24 $ 20
Allowance for credit losses, beginning of period 90 96
Bad debts expense 22 18
Write-offs, net of recoveries (24) (20)
Allowance for credit losses, end of period $ 88 $ 94