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INTANGIBLE ASSETS AND GOODWILL - Estimated Annual Amortization of Long-lived Assets With Finite Lives (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Estimated aggregate amortization expense    
2019 $ 1,877  
2020 1,613  
2021 1,365  
2022 1,214  
2023 1,063  
Thereafter 3,135  
Net Carrying Amount $ 10,267 $ 13,427