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Fair Value Measurement of Assets and Liabilities - Financial Assets Measured and Recorded at Fair Value on a Non-Recurring Basis (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Assets: |  |  |  |
Equity investments measured at cost minus impairment | $ 801 | $ 779 | $ 520 | $ 497
Fair Value, measurements, not on a recurring basis |  |  |  |
Assets: |  |  |  |
Non-marketable equity investments measured using the Measurement Alternative | 33 | 335 |  |
Other assets | 86 | 44 |  |
Total financial assets | 119 | 379 |  |
Equity investments measured at cost minus impairment | 768 | 444 |  |
Fair Value, measurements, not on a recurring basis | Significant Other Observable Inputs (Level 2) |  |  |  |
Assets: |  |  |  |
Non-marketable equity investments measured using the Measurement Alternative | 33 | 335 |  |
Other assets | 86 | 44 |  |
Total financial assets | $ 119 | $ 379 |  |

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- Definition Amount of investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120269885&loc=SL75117539-209714 + Details
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- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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