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INCOME TAXES - Other credit carryforwards (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Income taxes    
Recognized credits $ (68) $ (37)
Recognized DTA 68 37
Non-recognised other carry forwards   (187)
Non-recognized DTA   45
0 - 5 years    
Income taxes    
Recognized credits (68) (37)
Recognized DTA $ 68 37
Indefinite    
Income taxes    
Non-recognised other carry forwards   (187)
Non-recognized DTA   $ 45