Cash and Cash Equivalents and Marketable Securities - Narrative (Details) - USD ($) $ in Millions |
Dec. 31, 2019 |
Dec. 31, 2018 |
|---|---|---|
| Cash and Cash Equivalents and Marketable Securities [Abstract] | ||
| Gross unrealized gains on marketable securities | $ 205 | $ 24 |
| Gross unrealized losses on marketable securities | (24) | (357) |
| Gross unrealized losses in continuous loss position for 12 months or longer | $ (17) | $ (332) |
| X | ||||||||||
- Definition Cash and Cash Equivalents and Marketable Securities [Abstract] No definition available.
|
| X | ||||||||||
- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|