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Goodwill and Intangible Assets - Amortization Expense (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]    
2016 $ 701  
2017 658  
2018 603  
2019 520  
2020 357  
Thereafter 347  
Net Carrying Amount $ 3,186 $ 3,869