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Stock-Based Compensation Expense (Tables) | 6 Months Ended
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Jun. 30, 2026
Share-Based Payment Arrangement [Abstract] |
Schedule of Stock-Based Compensation Expense | Stock-based compensation expense was as follows (in millions):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2026 |  | 2025 |  | 2026 |  | 2025
Infrastructure and trust & safety | $ | 34 |  |  | $ | 34 |  |  | $ | 69 |  |  | $ | 68 |
Research and development | 195 |  |  | 189 |  |  | 387 |  |  | 366 |
General and administrative | 41 |  |  | 49 |  |  | 78 |  |  | 85 |
Sales and marketing | 12 |  |  | 13 |  |  | 23 |  |  | 25 |
Total stock-based compensation expense | $ | 282 |  |  | $ | 285 |  |  | $ | 557 |  |  | $ | 544 |
Schedule of Stock Option Activity | The following table summarizes the Company’s stock option activity:
| Stock Options Outstanding
| Number of Shares Subject to Options (in thousands) |  | Weighted-Average Exercise Price (per Option) |  | Weighted-Average Remaining Contractual Term (Years) |  | Aggregate Intrinsic Value (in millions)
Balances as of December 31, 2025 | 9,178 |  |  | $ | 3.64 |  |  | 3.07 |  | $ | 710 |
Cancelled, forfeited, and expired | (17) |  |  | $ | 1.05 |  |  |  |  |
Exercised | (1,759) |  |  | $ | 3.50 |  |  |  |  |
Balances as of June 30, 2026 | 7,402 |  |  | $ | 3.68 |  |  | 2.71 |  | $ | 375 |
Schedule of Restricted Stock Units and Restricted Stock Awards Activity and Restricted Stock Units (RSUs) and Performance Share Units | The following table summarizes the Company’s RSU, RSA, and PSU activities, excluding the 2024 CEO PSU Award, which is described in more detail in the following section:
| Unvested RSUs and RSAs Outstanding |  | Unvested Management PSUs Outstanding(1)
| Number of Shares (in thousands) |  | Weighted-Average Grant Date Fair Value (per Share) |  | Number of Shares (in thousands) |  | Weighted-Average Grant Date Fair Value (per Share)
Unvested as of December 31, 2025 | 24,524 |  |  | $ | 63.59 |  |  | 1,826 |  |  | $ | 51.78 |
Granted | 15,277 |  |  | $ | 53.71 |  |  | 773 |  |  | $ | 72.52 |
Vested | (9,654) |  |  | $ | 54.74 |  |  | (561) |  |  | $ | 42.34 |
Cancelled | (2,483) |  |  | $ | 62.28 |  |  | (312) |  |  | $ | 52.29 |
Unvested as of June 30, 2026 | 27,664 |  |  | $ | 61.34 |  |  | 1,726 |  |  | $ | 64.04 |
(1)Includes PSUs issued to certain members of management (the “Management PSUs”) in each of the years 2023 through 2026 and excludes the 2024 CEO PSU Award, which is described in more detail below. The Management PSUs include awards with financial performance-based targets and market performance-based targets. All unvested PSU grants and balances are shown at the aggregate maximum number of shares that were granted and may be earned and issued with respect to each award over its full term (up through any applicable cancellation). Stock-based compensation expense recognized related to the Management PSUs was $2 million and $9 million during the three and six months ended June 30, 2026, respectively, and $17 million and $23 million during the three and six months ended June 30, 2025, respectively.

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