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Equipment Installment Plan Receivables, Gross Receivables by Credit Category (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]    
Equipment installment plan receivables, gross $ 661 $ 628
Unbilled    
Financing Receivable, Recorded Investment [Line Items]    
Equipment installment plan receivables 626 591
Billed    
Financing Receivable, Recorded Investment [Line Items]    
Equipment installment plan receivables 22 25
Equipment installment plan receivables, past due 13 12
Lower Risk    
Financing Receivable, Recorded Investment [Line Items]    
Equipment installment plan receivables, gross 612 586
Lower Risk | Unbilled    
Financing Receivable, Recorded Investment [Line Items]    
Equipment installment plan receivables 582 553
Lower Risk | Billed    
Financing Receivable, Recorded Investment [Line Items]    
Equipment installment plan receivables 20 23
Equipment installment plan receivables, past due 10 10
Higher Risk    
Financing Receivable, Recorded Investment [Line Items]    
Equipment installment plan receivables, gross 49 42
Higher Risk | Unbilled    
Financing Receivable, Recorded Investment [Line Items]    
Equipment installment plan receivables 44 38
Higher Risk | Billed    
Financing Receivable, Recorded Investment [Line Items]    
Equipment installment plan receivables 2 2
Equipment installment plan receivables, past due $ 3 $ 2