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Investments and Fair Value Measurement - Investments (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Marketable Securities [Line Items] |  |
Marketable debt securities | $ 0 | $ 1,180
Marketable equity securities | 1,386 | 0
Note receivable from a related party | 81 | 83
Investments | 12,239 | 9,052
Commercial paper |  |
Marketable Securities [Line Items] |  |
Marketable debt securities | 0 | 457
U.S. government and agency securities |  |
Marketable Securities [Line Items] |  |
Marketable debt securities | 0 | 429
Corporate bonds |  |
Marketable Securities [Line Items] |  |
Marketable debt securities | 0 | 294
Didi |  |
Marketable Securities [Line Items] |  |
Non-marketable equity securities: | 4,126 | 6,299
Aurora |  |
Marketable Securities [Line Items] |  |
Non-marketable equity securities: | 2,250 | 0
Other |  |
Marketable Securities [Line Items] |  |
Non-marketable equity securities: | 307 | 329
Grab |  |
Marketable Securities [Line Items] |  |
Non-marketable debt securities: | $ 4,089 | $ 2,341

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