Device Installment Plan Receivables, Net (Detail) - USD ($) $ in Millions |
Mar. 31, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Device installment plan receivables, gross | $ 3,346 | $ 3,720 |
| Unamortized imputed interest | (135) | (142) |
| Device installment plan receivables, net of unamortized imputed interest | 3,211 | 3,578 |
| Allowance for credit losses | (513) | (444) |
| Device installment plan receivables, net | 2,698 | 3,134 |
| Accounts Receivable | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Device installment plan receivables, net | 1,663 | 1,979 |
| Other Assets | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Device installment plan receivables, net | $ 1,035 | $ 1,155 |