v2.4.0.8
Changes in Carrying Amount of Goodwill (Detail) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2014
Goodwill [Line Items]  
Beginning balance $ 24,634
Acquisitions and other (Note 2) 29
Ending balance 24,663
Wireless
 
Goodwill [Line Items]  
Beginning balance 18,376
Acquisitions and other (Note 2) 15
Ending balance 18,391
Wireline
 
Goodwill [Line Items]  
Beginning balance 6,258
Acquisitions and other (Note 2) 14
Ending balance $ 6,272