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Aggregate Amortization Expense for Acquired Intangible Assets (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Finite-Lived Intangible Liabilities [Line Items]  
Amortization expense - Actual 2014 $ 11
Amortization expense - 2014 46
Amortization expense - 2015 36
Amortization expense - 2016 27
Amortization expense - 2017 18
Amortization expense - 2018 $ 7