Supplemental Financial Statement Information (Accrued Expenses and Other Current Liabilities) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Balance Sheet Components Disclosure [Abstract]
European Commission fines	$ 10,254	$ 10,409
Payables to brokers for unsettled investment trades	966	754
Accrued customer liabilities	2,865	3,118
Accrued purchases of property and equipment	2,387	2,197
Current operating lease liabilities	2,037	1,694
Other accrued expenses and current liabilities	10,472	10,459
Accrued expenses and other current liabilities	$ 28,981	$ 28,631