|
Reconciliation of Segment Assets (Detail) (USD $)
In Millions, unless otherwise specified |
Mar. 31, 2015
|
Dec. 31, 2014
|
|---|---|---|
| Segment Reporting Information [Line Items] | ||
| Assets | $ 235,790 | $ 232,708 |
| Operating Segments | ||
| Segment Reporting Information [Line Items] | ||
| Assets | 250,384 | 237,058 |
| Operating Segments | Wireless | ||
| Segment Reporting Information [Line Items] | ||
| Assets | 171,760 | 160,385 |
| Operating Segments | Wireline | ||
| Segment Reporting Information [Line Items] | ||
| Assets | 78,624 | 76,673 |
| Corporate, Eliminations and Other | ||
| Segment Reporting Information [Line Items] | ||
| Assets | $ (14,594) | $ (4,350) |