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Goodwill and Intangible Assets - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]    
Amortization of intangibles $ 162 $ 187
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2017 464  
2018 538  
2019 109  
2020 48  
2021 2  
2022 $ 1