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RECENTLY ISSUED ACCOUNTING STANDARDS Recently Issued Accounting Standards (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
New Accounting Pronouncement or Change in Accounting Principle, Retrospective Adjustments [Abstract]      
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Operating Results $ 135 $ 3 $ (40)