Financial Instruments - Total Short-term and Long-term Investments (Details) - USD ($) $ in Millions |
Dec. 31, 2020 |
Dec. 31, 2019 |
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| Short-term investments | ||||||
| Equity securities with readily determinable fair values | [1] | $ 567 | $ 705 | |||
| Available-for-sale debt securities | 9,709 | 6,687 | ||||
| Held-to-maturity debt securities | 161 | 1,133 | ||||
| Total Short-term investments | 10,437 | 8,525 | ||||
| Long-term investments | ||||||
| Equity securities with readily determinable fair values | 2,809 | 1,902 | ||||
| Available-for-sale debt securities | 128 | 315 | ||||
| Held-to-maturity debt securities | 37 | 42 | ||||
| Private Equity Investments | [2] | 432 | 756 | |||
| Long-term investments | 3,406 | 3,014 | ||||
| Equity-method investments | 16,856 | 17,133 | ||||
| Total long-term investments and equity-method investments | 20,262 | 20,147 | ||||
| Held-to-maturity cash equivalents | $ 89 | $ 163 | ||||
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- Definition Equity Securities, FV-NI, Noncurrent No definition available.
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- Definition Held-To-Maturity Cash Equivalents No definition available.
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- Definition Private Equity Investments No definition available.
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as current. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as noncurrent. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of investment in debt security measured at amortized cost (held-to-maturity), classified as current. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of investment in debt security measured at amortized cost (held-to-maturity), classified as noncurrent. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The total amount of investments that are intended to be held for an extended period of time (longer than one operating cycle). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- References No definition available.
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- Definition Amount of long-term investments classified as other. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of short-term investments classified as other. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- References No definition available.
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