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Goodwill and Other Intangible Assets (Expected Amortization Expense for Acquisition-Related Intangible Assets) (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]  
2021 $ 719
2022 375
2023 104
2024 78
2025 53
Thereafter 116
Total $ 1,445