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GOODWILL (Details) - Goodwill - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Reconciliation of changes in intangible assets and goodwill [abstract]    
Balance at beginning of the year $ 1,301 $ 502
Acquisitions through business combinations 2,905 815
Foreign currency translation and other (347) (16)
Balance at end of the year $ 3,859 $ 1,301