Business Combinations and Divestitures - Purchase Price Allocation of Identifiable Intangible Assets (Details) - Actelion [Member] $ in Millions	Jun. 16, 2017 USD ($)
Business Acquisition [Line Items]
Total intangible assets	$ 25,010
In-process research and development
Business Acquisition [Line Items]
Indefinite-lived Intangible Assets Acquired	780
Patents and trademarks
Business Acquisition [Line Items]
Total amortizable intangibles	$ 24,230