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Acquisitions (Details)			3 Months Ended
Acquisitions (Details)	Jan. 29, 2019 USD ($)	Nov. 20, 2018 GBP (£) £ / shares	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)	Mar. 31, 2019 GBP (£)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Business Acquisition [Line Items]
Document Period End Date			Mar. 31, 2019
Payments to Acquire Businesses, Net of Cash Acquired			$ 321,000,000	$ 9,000,000
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High						$ 914,000,000
Business Combination, Contingent Consideration, Liability						394,000,000	$ 347,000,000
Goodwill						8,179,000,000	$ 7,911,000,000
Exchange Rate, USD						1.30
Exchange Rate, GBP \| £					£ 1.00
Proposed BTG Acquisition [Member]
Business Acquisition [Line Items]
Business Acquisition, Share Price \| £ / shares		£ 8.40
Payments to Acquire Businesses, Net of Cash Acquired		£ 3,311,000,000	4,317,000,000
Millipede, Inc. [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred				$ 90,000,000
Payments to Acquire Businesses, Net of Cash Acquired			321,000,000
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage	20.00%
Payments to Acquire Businesses, Gross	$ 325,000,000
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	$ 125,000,000
Business Combination, Contingent Consideration, Liability						87,000,000
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value			103,000,000
Goodwill						271,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets						295,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets						2,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities						(1,000,000)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities						$ (57,000,000)
Business Combination, Consideration Transferred, Including Equity Interest in Acquiree Held Prior to Combination			510,000,000
Millipede, Inc. [Member] \| Purchased research and development [Member]
Business Acquisition [Line Items]
Indefinite-lived Intangible Assets Acquired			$ 295,000,000
Range of Risk Adjusted Discount Rates used in Purchase Price Allocation					20.00%	20.00%