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Goodwill, Customer Relationships and Other Intangible Assets - Schedule of Amortization Expense (Details)
$ in Millions
Sep. 30, 2019
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2019 (remaining three months) $ 427
2020 1,647
2021 1,212
2022 983
2023 $ 898