v2.4.0.8
Investment in Unconsolidated Businesses (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Schedule of Equity Method Investments [Line Items]    
Equity method investee $ 3,329 $ 3,306
Cost method investee 103 95
Total investments in unconsolidated businesses 3,432 3,401
Vodafone Omnitel N.V.
   
Schedule of Equity Method Investments [Line Items]    
Ownership 23.10%  
Equity method investee 2,511 2,200
Other Members
   
Schedule of Equity Method Investments [Line Items]    
Equity method investee $ 818 $ 1,106