|
Changes in Carrying Amount of Goodwill (Detail) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 12 Months Ended | |
|---|---|---|---|
|
Dec. 31, 2013
|
Dec. 31, 2013
|
Dec. 31, 2012
|
|
| Goodwill [Line Items] | |||
| Beginning balance | $ 24,139 | $ 23,357 | |
| Acquisitions (Note 2) | 300 | 495 | 760 |
| Reclassifications, adjustments and other | 22 | ||
| Ending balance | 24,634 | 24,634 | 24,139 |
|
Wireless
|
|||
| Goodwill [Line Items] | |||
| Beginning balance | 18,172 | 17,963 | |
| Acquisitions (Note 2) | 204 | 209 | |
| Ending balance | 18,376 | 18,376 | 18,172 |
|
Wireline
|
|||
| Goodwill [Line Items] | |||
| Beginning balance | 5,967 | 5,394 | |
| Acquisitions (Note 2) | 291 | 551 | |
| Reclassifications, adjustments and other | 22 | ||
| Ending balance | $ 6,258 | $ 6,258 | $ 5,967 |