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INTANGIBLE ASSETS - Net Amounts (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about intangible assets [line items]      
Net intangible assets $ 12,406 $ 11,767  
Cost      
Disclosure of detailed information about intangible assets [line items]      
Net intangible assets 14,117 13,233 $ 15,695
Accumulated amortization      
Disclosure of detailed information about intangible assets [line items]      
Net intangible assets $ (1,711) $ (1,466) $ (1,309)