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Goodwill and Other Intangible Assets - Schedule of Goodwill Rollforward (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Goodwill [Roll Forward]    
Goodwill, beginning balance $ 12,216 $ 12,291
Acquisitions 889 211
Divestitures   (344)
Foreign currency translation (38) 63
Other activity, net 18 (5)
Goodwill, ending balance $ 13,085 $ 12,216