Supplemental Financial Statement Information (Accrued Expenses and Other Current Liabilities) (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Balance Sheet Components Disclosure [Abstract]
European Commission fines	$ 9,388	$ 7,754
Accrued customer liabilities	1,808	1,810
Other accrued expenses and current liabilities	8,186	7,394
Accrued expenses and other current liabilities	$ 19,382	$ 16,958