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Goodwill, Customer Relationships and Other Intangible Assets - Schedule of Amortization Expense (Details)
$ in Millions
Mar. 31, 2020
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2020 (remaining nine months) $ 1,269
2021 1,226
2022 999
2023 916
2024 $ 851