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Goodwill and Intangible Assets - Amortization Expense (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]    
2017 $ 687  
2018 619  
2019 526  
2020 357  
2021 265  
Thereafter 81  
Net Carrying Amount $ 2,535 $ 3,186