Collaborative Arrangements - Schedule of Financial Information for Joint Venture (Details) - BMS & Gilead Sciences, LLC Joint Venture - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Total assets
Variable Interest Entity [Line Items]
Variable interest entity, assets	$ 1,499	$ 1,918
Cash and cash equivalents
Variable Interest Entity [Line Items]
Variable interest entity, assets	100	92
Accounts receivable, net
Variable Interest Entity [Line Items]
Variable interest entity, assets	197	229
Inventories
Variable Interest Entity [Line Items]
Variable interest entity, assets	1,191	1,579
Total liabilities
Variable Interest Entity [Line Items]
Variable interest entity, liabilities	512	772
Accounts payable
Variable Interest Entity [Line Items]
Variable interest entity, liabilities	222	434
Other accrued liabilities
Variable Interest Entity [Line Items]
Variable interest entity, liabilities	$ 290	$ 338