v3.4.0.3
Summary of Device Installment Receivables Sold under RPA and Revolving Program (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Receivables Purchase Agreement    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Device installment plan receivables sold, net [1]   $ 1,925
Cash proceeds received from new transfers   1,271
Deferred purchase price recorded   $ 695
Revolving Program    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Device installment plan receivables sold, net [1] $ 2,617  
Cash proceeds received from new transfers 1,978  
Cash proceeds received from reinvested collections 244  
Deferred purchase price recorded $ 395  
[1] Device installment plan receivables net of allowances, imputed interest and the device trade-in right.