v3.7.0.1
Device Payment Plan Receivables, Net (Detail) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Device payment plan agreement receivables, gross $ 13,154 $ 11,797    
Unamortized imputed interest (582) (511)    
Device payment plan agreement receivables, net of unamortized imputed interest 12,572 11,286    
Allowance for credit losses (685) (688) $ (513) $ (444)
Device payment plan agreement receivables, net 11,887 10,598    
Accounts Receivable, net        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Device payment plan agreement receivables, net 7,436 6,140    
Other Assets        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Device payment plan agreement receivables, net $ 4,451 $ 4,458