Information about Segments and Geographic Areas (Long-Lived Assets by Geographic Area) (Details) - USD ($) $ in Millions |
Jun. 30, 2021 |
Dec. 31, 2020 |
|---|---|---|
| Revenues from External Customers and Long-Lived Assets [Line Items] | ||
| Long-lived assets | $ 104,675 | $ 96,960 |
| United States | ||
| Revenues from External Customers and Long-Lived Assets [Line Items] | ||
| Long-lived assets | 74,993 | 69,315 |
| International | ||
| Revenues from External Customers and Long-Lived Assets [Line Items] | ||
| Long-lived assets | $ 29,682 | $ 27,645 |