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Acquisition Impairment of Intangible Assets (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Impairment of Intangible Asset [Abstract]      
In-process research and development impairment $ 820,000,000 $ 0 $ 432,000,000
Indefinite-lived Intangible Assets (Excluding Goodwill) $ 0