v3.4.0.3
Composition of Other Intangible Assets Net (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]    
Gross Amount $ 21,207 $ 20,901
Accumulated Amortization (12,991) (12,563)
Net Amount 8,216 8,338
Customer Lists    
Finite-Lived Intangible Assets [Line Items]    
Gross Amount 4,136 4,139
Accumulated Amortization (2,421) (2,365)
Net Amount $ 1,715 1,774
Customer Lists | Minimum    
Finite-Lived Intangible Assets [Line Items]    
Useful life for finite-lived intangible assets, years 5 years  
Customer Lists | Maximum    
Finite-Lived Intangible Assets [Line Items]    
Useful life for finite-lived intangible assets, years 14 years  
Non-Network Internal-Use Software    
Finite-Lived Intangible Assets [Line Items]    
Gross Amount $ 14,769 14,542
Accumulated Amortization (9,921) (9,620)
Net Amount $ 4,848 4,922
Non-Network Internal-Use Software | Minimum    
Finite-Lived Intangible Assets [Line Items]    
Useful life for finite-lived intangible assets, years 3 years  
Non-Network Internal-Use Software | Maximum    
Finite-Lived Intangible Assets [Line Items]    
Useful life for finite-lived intangible assets, years 8 years  
Other Intangible Assets    
Finite-Lived Intangible Assets [Line Items]    
Gross Amount $ 2,302 2,220
Accumulated Amortization (649) (578)
Net Amount $ 1,653 $ 1,642
Other Intangible Assets | Minimum    
Finite-Lived Intangible Assets [Line Items]    
Useful life for finite-lived intangible assets, years 5 years  
Other Intangible Assets | Maximum    
Finite-Lived Intangible Assets [Line Items]    
Useful life for finite-lived intangible assets, years 25 years