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Equipment Installment Plan Receivables, EIP Receivables (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Equipment installment plans [Line Items]    
Equipment installment plan receivables, gross $ 887 $ 873
Deferred interest 0 (80)
Equipment installment plan receivables, net of deferred interest 887 793
Allowance for credit losses (62) (65)
Equipment installment plan receivables, net 825 728
Accounts receivable - Customers and agents (Current portion)    
Equipment installment plans [Line Items]    
Equipment installment plan receivables, net 514 428
Other assets and deferred charges (Non-current portion)    
Equipment installment plans [Line Items]    
Equipment installment plan receivables, net $ 311 $ 300