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Intangible Assets - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]    
Amortization expenses $ 86 $ 82
Weighted average amortization period for all intangible assets (years) 20 years  
Estimated amortization charged to income, 2014 260  
Estimated amortization charged to income, 2015 336  
Estimated amortization charged to income, 2016 324  
Estimated amortization charged to income, 2017 320  
Estimated amortization charged to income, 2018 315  
Estimated amortization charged to income, 2019 $ 304