Other Current Receivables (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Other current receivables	$ 7,232	$ 7,499
Pharmaceutical manufacturer rebates receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Other current receivables	$ 4,200	$ 3,300