Collaborative Arrangements - Schedule of Variable Interest Entity (Details) - BMS & Gilead Sciences, LLC Joint Venture [Member] $ in Millions	Dec. 31, 2016 USD ($)
Total Assets [Member]
Variable Interest Entity [Line Items]
Variable Interest Entities, Assets	$ 1,918
Cash and Cash Equivalents [Member]
Variable Interest Entity [Line Items]
Variable Interest Entities, Assets	92
Accounts Receivable [Member]
Variable Interest Entity [Line Items]
Variable Interest Entities, Assets	229
Inventories [Member]
Variable Interest Entity [Line Items]
Variable Interest Entities, Assets	1,579
Total Liabilities [Member]
Variable Interest Entity [Line Items]
Variable Interest Entities, Liabilities	772
Accounts Payable [Member]
Variable Interest Entity [Line Items]
Variable Interest Entities, Liabilities	434
Other Accrued Liabilities [Member]
Variable Interest Entity [Line Items]
Variable Interest Entities, Liabilities	$ 338