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Goodwill and Intangible Assets-Estimated Annual Amortization Expense (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]  
2013 $ 340
2014 302
2015 269
2016 240
2017 $ 216