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Goodwill and Other Intangible Assets - Other Intangible Rollforward (Details)
$ in Millions
9 Months Ended
Sep. 30, 2019
USD ($)
Finite-lived Intangible Assets [Roll Forward]  
Other intangible assets balance at December 31, 2018 $ 10,462
Acquisitions 116
Foreign currency translation (13)
Amortization of other intangible assets (235)
Other intangible assets balance at September 30, 2019 $ 10,330