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Equipment Installment Plans - EIP Receivables (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Equipment installment plan receivables, gross $ 1,110 $ 1,151
Allowance for credit losses (82) (90)
Equipment installment plan receivables, net 1,028 1,061
Accounts receivable — Customers and agents (Current portion)    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Equipment installment plan receivables, net 592 577
Other assets and deferred charges (Non-current portion)    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Equipment installment plan receivables, net $ 436 $ 484