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Goodwill and Intangible Assets - Estimated Amortization Expense (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]    
The remainder of 2014 $ 66  
2015 260  
2016 244  
2017 209  
2018 163  
Thereafter 315  
Net Carrying Amount $ 1,257 $ 883