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Supplemental Financial Statement Information - Other Income (Expenses), Net (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jan. 19, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Interest income |  | $ 10 | $ 7 |  | $ 28 | $ 51
Foreign currency exchange gains (losses), net |  | (13) | (47) |  | (38) | (104)
Gain (Loss) on business divestitures, net |  | 0 | 0 |  | 1,684 | 127
Unrealized gain (loss) on debt and equity securities |  | (2,031) | (7) |  | (56) | (123)
Allowance reversal (impairment) of debt and equity securities |  | 0 | 160 |  | 0 | (1,690)
Other, net |  | 202 | 38 |  | 203 | 51
Other income (expense), net |  | (1,832) | 151 |  | 1,821 | (1,688)
Downward adjustments including impairment |  | 0 | $ 0 |  | 0 | 1,690
Aurora |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Unrealized gain (loss) on debt and equity securities |  | 102 |  |  | 573 |
Didi |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Unrealized gain (loss) on debt and equity securities |  | (3,200) |  |  | (1,700) |
Zomato |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Unrealized gain (loss) on debt and equity securities |  | 994 |  |  |  |
Other Investments |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Unrealized gain (loss) on debt and equity securities |  | $ 73 |  |  | 56 |
Uber Eats India | Not Discontinued Operations |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Gain (Loss) on business divestitures, net |  |  |  |  |  | $ 154
JUMP Divestiture | Not Discontinued Operations |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Gain (Loss) on business divestitures, net |  |  |  | $ (27) |  |
Apparate | Not Discontinued Operations |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Gain (Loss) on business divestitures, net | $ 1,644 |  |  |  | $ 1,600 |

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