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INTANGIBLE ASSETS AND GOODWILL - Amortization Expense (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Estimated aggregate amortization expense    
2021 $ 1,389  
2022 1,204  
2023 1,030  
2024 905  
2025 822  
Thereafter 1,390  
Net Carrying Amount $ 6,740 $ 8,490