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GOODWILL AND INTANGIBLE ASSETS (Goodwill) (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Goodwill [Roll Forward]    
Goodwill, Balance at beginning of period $ 6,000 $ 5,905
Goodwill acquired during the period 164 95
Goodwill, Balance at end of period $ 6,164 $ 6,000