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Equipment Installment Plan Receivables, EIP Receivables (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Equipment installment plans [Line Items]    
Equipment installment plan receivables, gross $ 628 $ 381
Deferred interest (53) (23)
Equipment installment plan receivables, net of deferred interest 575 358
Allowance for credit losses (50) (26)
Equipment installment plan receivables, net 525 332
Accounts receivable - Due from customers and agents    
Equipment installment plans [Line Items]    
Equipment installment plan receivables, net 345 264
Other assets and deferred charges    
Equipment installment plans [Line Items]    
Equipment installment plan receivables, net $ 180 $ 68