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Equipment Installment Plan Receivables, EIP Receivables (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Equipment installment plans [Line Items]    
Equipment installment plan receivables, gross $ 873 $ 628
Deferred interest (80) (53)
Equipment installment plan receivables, net of deferred interest 793 575
Allowance for credit losses (65) (50)
Equipment installment plan receivables, net 728 525
Accounts receivable - Customers and agents (current portion)    
Equipment installment plans [Line Items]    
Equipment installment plan receivables, net 428 345
Other assets and deferred charges (Non-current portion)    
Equipment installment plans [Line Items]    
Equipment installment plan receivables, net $ 300 $ 180