Balance and Aging of Device Payment Plan Agreement Receivables on Gross Basis (Detail) - USD ($) $ in Millions |
Jun. 30, 2017 |
Dec. 31, 2016 |
|---|---|---|
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Device payment plan agreement receivables, gross | $ 14,505 | $ 11,797 |
| Unbilled | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Device payment plan agreement receivables, current | 13,714 | 11,089 |
| Billed | ||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Device payment plan agreement receivables, current | 659 | 557 |
| Device payment plan agreement receivables, past due | $ 132 | $ 151 |