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Identified Intangible Assets - Schedule of Estimated Amortization Expense for Identified Intangible Assets (Detail) (Other Identified Intangible Assets [Member], USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Other Identified Intangible Assets [Member]
 
Schedule Of Estimated Future Amortization Expense [Line Items]  
2013 $ 232
2014 153
2015 132
2016 127
2017 $ 113