v3.24.4
Receivables and Related Allowance for Credit Losses - Schedule of Equipment Installment Plan Receivables (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2024
USD ($)
segment
class
Dec. 31, 2023
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Portfolio segments | segment 2  
Customer classes | class 2  
EIP receivables, gross $ 7,402 $ 7,271
Unamortized imputed discount (524) (505)
EIP receivables, net of unamortized imputed discount 6,878 6,766
Allowance for credit losses (290) (268)
EIP receivables, net of allowance for credit losses and imputed discount 6,588 6,498
Equipment installment plan receivables, net of allowance for credit losses and imputed discount    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
EIP receivables, net of allowance for credit losses and imputed discount 4,379 4,456
Equipment installment plan receivables due after one year, net of allowance for credit losses and imputed discount    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
EIP receivables, net of allowance for credit losses and imputed discount $ 2,209 $ 2,042
EIP Receivables Allowance    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Weighted average effective imputed interest rate 11.10% 10.60%