XML 49 R26.htm IDEA: XBRL DOCUMENT v3.8.0.1
Equipment Installment Plan Receivables, Gross Receivables by Credit Category (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]    
Equipment installment plan receivables, gross $ 776 $ 628
Unbilled    
Financing Receivable, Recorded Investment [Line Items]    
Equipment installment plan receivables 737 591
Billed    
Financing Receivable, Recorded Investment [Line Items]    
Equipment installment plan receivables 27 25
Equipment installment plan receivables, past due 12 12
Lower Risk    
Financing Receivable, Recorded Investment [Line Items]    
Equipment installment plan receivables, gross 749 586
Lower Risk | Unbilled    
Financing Receivable, Recorded Investment [Line Items]    
Equipment installment plan receivables 713 553
Lower Risk | Billed    
Financing Receivable, Recorded Investment [Line Items]    
Equipment installment plan receivables 26 23
Equipment installment plan receivables, past due 10 10
Higher Risk    
Financing Receivable, Recorded Investment [Line Items]    
Equipment installment plan receivables, gross 27 42
Higher Risk | Unbilled    
Financing Receivable, Recorded Investment [Line Items]    
Equipment installment plan receivables 24 38
Higher Risk | Billed    
Financing Receivable, Recorded Investment [Line Items]    
Equipment installment plan receivables 1 2
Equipment installment plan receivables, past due $ 2 $ 2