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Equipment Installment Plans - Allowance for Credit Losses (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Allowance for credit losses    
Allowance for credit losses, beginning of period $ 96  
Allowance for credit losses, end of period 94  
Equipment Installment Plan Receivable    
Allowance for credit losses    
Write-offs, net of recoveries, originated in 2021 6  
Write-offs, net of recoveries, originated in 2022 14  
Write-offs, net of recoveries, originated in 2023 0  
Write-offs, net of recoveries, Total 20 $ 16
Allowance for credit losses, beginning of period 96 72
Bad debts expense 18 17
Write-offs, net of recoveries (20) (16)
Allowance for credit losses, end of period $ 94 $ 73