Supplemental Financial Statement Information (Accrued Expenses and Other Current Liabilities) (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Balance Sheet Components Disclosure [Abstract]
European Commission fine	$ 2,844	$ 0
Accrued customer liabilities	1,262	1,256
Other accrued expenses and current liabilities	5,201	4,888
Accrued expenses and other current liabilities	$ 9,307	$ 6,144