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Intangible Assets and Goodwill Accumulated Amortization Rollforward (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Accumulated Amortization [Roll Forward]    
Balance at January 1 $ 568 $ 400
Amortization 124 117
Impairment of Intangible Assets, Finite-lived 10 0
Foreign currency translation and other (35) 51
Balance at December 31 $ 667 $ 568