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Equipment Installment Plans - EIP Receivables (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Equipment installment plan receivables, gross $ 948 $ 1,008
Allowance for credit losses (82) (84)
Equipment installment plan receivables, net 866 924
Accounts receivable — Customers and agents (Current portion)    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Equipment installment plan receivables, net 562 587
Other assets and deferred charges (Non-current portion)    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Equipment installment plan receivables, net $ 304 $ 337