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Acquisitions, Divestitures, Research Collaborations and License Agreements - Schedule of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions	Jan. 21, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Acquisitions Divestitures Research Collaborations And License Agreements Transactions [Line Items]
Goodwill		$ 18,284	$ 18,162	$ 17,723
Contingent consideration		$ 935	$ 891	$ 590
Cubist Pharmaceuticals Inc
Acquisitions Divestitures Research Collaborations And License Agreements Transactions [Line Items]
Cash and cash equivalents	$ 733
Accounts receivable	123
Inventories	216
Other current assets	55
Property, plant and equipment	151
Products and product rights (11 year weighted-average useful life)	6,923
IPR&D	50
Other noncurrent assets	184
Current liabilities	(233)
Deferred income tax liabilities	(2,519)
Long-term debt	(1,900)
Other noncurrent liabilities	(122)
Total identifiable net assets	3,661
Goodwill	4,670
Consideration transferred	$ 8,331
Finite-lived intangible assets, useful life	11 years
Cubist Pharmaceuticals Inc | Other current liabilities
Acquisitions Divestitures Research Collaborations And License Agreements Transactions [Line Items]
Contingent consideration	$ 73
Cubist Pharmaceuticals Inc | Other noncurrent liabilities
Acquisitions Divestitures Research Collaborations And License Agreements Transactions [Line Items]
Contingent consideration	$ 50

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