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Business Combinations - Narrative (Details) - USD ($) |  |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jan. 11, 2021 | Dec. 01, 2020 | Jan. 02, 2020 | Mar. 31, 2021 | Sep. 30, 2020 | Jun. 30, 2021 | Dec. 31, 2020
Business Acquisition [Line Items] |  |  |  |  |  |  |
Convertible notes settled |  |  |  |  |  | $ 426,000,000 |
Convertible notes settled in cash |  |  |  |  |  | 194,000,000 |
Convertible notes settled in equity |  |  |  |  |  | 232,000,000 |
Goodwill purchase period adjustment |  |  |  |  |  | 183,000,000 |
CS Mexico |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Ownership interest | 57.00% |  |  |  |  |  |
CS-Global | CS Mexico |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Ownership interest | 100.00% |  |  |  |  |  |
Careem Inc. |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Consideration transferred |  |  | $ 3,000,000,000.0 |  |  |  |
Convertible notes |  |  | $ 1,600,000,000 |  |  |  |
Term of convertible notes |  |  | 90 days |  |  |  |
Commitment to issue unsecured convertible notes in connection with Careem acquisition |  |  |  |  |  | 227,000,000 |
Commitment to issue unsecured convertible notes in connection with Careem acquisition |  |  |  |  |  | $ 121,000,000 |
Careem Inc. | The Careem Notes | Convertible notes |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Conversion price (in dollars per share) |  |  | $ 55 |  |  |  |
Careem Inc. | The Careem Notes | Convertible notes |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Aggregate principal amount |  |  | $ 880,000,000 |  |  |  |
CS-Global |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Interest acquired (in percent) |  |  |  |  | 55.00% |  |
Period after closing date |  |  |  |  | 5 years |  |
CS-Mexico | CS-Global |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Voting interest to be acquired contingent on regulatory approval |  |  |  |  |  |  | 100.00%
Postmates Inc. |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Consideration transferred |  | $ 3,900,000,000 |  |  |  |  |
Interest acquired (in percent) |  | 100.00% |  |  |  |  |
Goodwill purchase period adjustment |  |  |  | $ 170,000,000 |  |  |
Accrued and other liability, purchase accounting adjustments |  |  |  | $ 170,000,000 |  |  |
CS Mexico |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Interest acquired (in percent) | 55.00% |  |  |  |  |  |

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