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Goodwill and Other Acquired Intangibles - Future Amortization Expense (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]  
2021 $ 2,249
2022 1,842
2023 1,812
2024 1,770
2025 $ 1,718