Supplemental Financial Statement Information (Accrued Expenses and Other Current Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Balance Sheet Components Disclosure [Abstract]
European Commission fines	$ 10,409	$ 9,405
Accrued customer liabilities	3,118	2,245
Accrued purchases of property and equipment	2,197	2,411
Current operating lease liabilities	1,694	1,199
Other accrued expenses and current liabilities	11,213	7,807
Accrued expenses and other current liabilities	$ 28,631	$ 23,067
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:AccruedLiabilitiesCurrent	us-gaap:AccruedLiabilitiesCurrent