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Equipment Installment Plans - Allowance for Credit Losses (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Allowance for credit losses    
Allowance for credit losses, beginning of year $ 90  
Allowance for credit losses, end of year 82 $ 90
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 18  
Write-offs, net of recoveries, originated in 2023 40  
Write-offs, net of recoveries, originated in 2024 16  
Write-offs, net of recoveries 73 75
Allowance for credit losses, beginning of year 90 96
Bad debts expense 65 69
Write-offs, net of recoveries (73) (75)
Allowance for credit losses, end of year $ 82 $ 90