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Intangible Assets, Net - Estimated Future Amortization Expense Related to Intangible Assets (Detail) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]    
2013 $ 14 $ 27
2014 27 27
2015 26 27
2016 25 25
2017 25 25
Thereafter 196 195
Net Carrying Amount $ 313 $ 326