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Goodwill and Other Intangible Assets - Other Intangible Rollforward (Details)
$ in Millions
6 Months Ended
Jun. 30, 2019
USD ($)
Finite-lived Intangible Assets [Roll Forward]  
Other intangible assets balance at December 31, 2018 $ 10,462
Acquisitions 135
Foreign currency translation 5
Amortization of other intangible assets (156)
Other intangible assets balance at June 30, 2019 $ 10,446