Balance and Aging of Device Payment Plan Agreement Receivables on Gross Basis (Detail) - USD ($) $ in Millions |
Mar. 31, 2017 |
Dec. 31, 2016 |
|---|---|---|
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Device payment plan agreement receivables, gross | $ 13,154 | $ 11,797 |
| Unbilled | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Device payment plan agreement receivables, current | 12,476 | 11,089 |
| Billed | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Device payment plan agreement receivables, current | 552 | 557 |
| Device payment plan agreement receivables, past due | $ 126 | $ 151 |