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Goodwill and Other Intangible Assets - Schedule of Future Estimated Amortization Expense (Details)
$ in Millions
Jun. 30, 2018
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
Remainder of 2018 $ 185
2019 367
2020 331
2021 283
2022 247
2023 $ 226