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Goodwill and Other Intangible Assets - Summary of Estimated Future Amortization Expense (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Goodwill And Intangible Assets Disclosure [Abstract]  
2013 $ 330
2014 303
2015 269
2016 194
2017 165
Thereafter 1,373
Total estimated future amortization expenses $ 2,634