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Goodwill and Other Intangible Assets - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]      
Amortization of other intangible assets $ 294 $ 201 $ 164
Amortization expense, 2018 294    
Amortization expense, 2019 282    
Amortization expense, 2020 276    
Amortization expense, 2021 264    
Amortization expense, 2022 $ 260