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INTANGIBLE ASSETS AND GOODWILL - Amortization Expense (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]    
Remainder of 2021 $ 1,025  
2022 1,188  
2023 1,018  
2024 895  
2025 811  
2026 679  
Thereafter 676  
Net Carrying Amount $ 6,292 $ 6,740