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INTANGIBLE ASSETS - Net Amounts (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about intangible assets [line items]      
Net intangible assets $ 12,658 $ 14,386  
Cost      
Disclosure of detailed information about intangible assets [line items]      
Net intangible assets 14,012 15,695 $ 12,515
Accumulated amortization      
Disclosure of detailed information about intangible assets [line items]      
Net intangible assets $ (1,354) $ (1,309) $ (880)