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Intangible Assets - Schedule of Future Estimated Amortization Expense (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]  
Reminder of 2014 $ 28
2015 102
2016 101
2017 97
2018 91
2019 $ 88