v3.7.0.1
Composition of Other Intangible Assets, Net (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]    
Gross Amount $ 21,329 $ 20,873
Accumulated Amortization (12,417) (11,976)
Net Amount 8,912 8,897
Customer Lists    
Finite-Lived Intangible Assets [Line Items]    
Gross Amount 3,163 2,884
Accumulated Amortization (548) (480)
Net Amount $ 2,615 2,404
Customer Lists | Minimum    
Finite-Lived Intangible Assets [Line Items]    
Useful life for finite-lived intangible assets, years 8 years  
Customer Lists | Maximum    
Finite-Lived Intangible Assets [Line Items]    
Useful life for finite-lived intangible assets, years 10 years  
Non-Network Internal-Use Software    
Finite-Lived Intangible Assets [Line Items]    
Gross Amount $ 16,459 16,135
Accumulated Amortization (11,251) (10,913)
Net Amount $ 5,208 5,222
Non-Network Internal-Use Software | Minimum    
Finite-Lived Intangible Assets [Line Items]    
Useful life for finite-lived intangible assets, years 5 years  
Non-Network Internal-Use Software | Maximum    
Finite-Lived Intangible Assets [Line Items]    
Useful life for finite-lived intangible assets, years 7 years  
Other Intangible Assets    
Finite-Lived Intangible Assets [Line Items]    
Gross Amount $ 1,707 1,854
Accumulated Amortization (618) (583)
Net Amount $ 1,089 $ 1,271
Other Intangible Assets | Minimum    
Finite-Lived Intangible Assets [Line Items]    
Useful life for finite-lived intangible assets, years 6 years  
Other Intangible Assets | Maximum    
Finite-Lived Intangible Assets [Line Items]    
Useful life for finite-lived intangible assets, years 25 years