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INTANGIBLE ASSETS - Net Amounts (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Disclosure of detailed information about intangible assets [line items]        
Net intangible assets $ 8,868 $ 9,894    
Cost        
Disclosure of detailed information about intangible assets [line items]        
Net intangible assets 9,555 10,470 $ 10,292 $ 4,732
Accumulated amortization        
Disclosure of detailed information about intangible assets [line items]        
Net intangible assets $ (687) $ (576) $ (418) $ (267)