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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2023
Share-Based Payment Arrangement [Abstract] |
Schedule of Stock-Based Compensation Expense | The following table summarizes total stock-based compensation expense (in millions):
| Year Ended December 31,
| 2021 | 2022 | 2023
Operations and support | $ | 49 |  | $ | 63 |  | $ | 68 |
Product development | 545 |  | 548 |  | 694 |
Sales and marketing | 100 |  | 114 |  | 130 |
General and administrative | 205 |  | 205 |  | 228 |
Stock-based compensation expense | $ | 899 |  | $ | 930 |  | $ | 1,120 |
Schedule of Fair Value Assumptions of Options Awarded | The fair value of each stock option award is estimated on the date of grant using the Black-Scholes option-pricing model using the range of assumptions in the following table:
| Year Ended December 31,
| 2021 | 2022 | 2023
Expected term (years) | 8.0 | 6.1 | 1.4 - 6.1
Risk-free interest rate | 1.1% - 1.5% | 0.3% - 2.2% | 3.6% - 5.0%
Expected volatility | 44.2% - 44.9% | 48.6% - 58.4% | 51.3% - 54.4%
Expected dividend yield | — |  | — |  | — |
Schedule of Stock Option Activity | A summary of stock option and RSU activity under the Plans was as follows (in millions, except per share amounts):
|  |  | Outstanding Stock Options |  | Outstanding Restricted Stock Units
| Shares Available for Grant |  | Number of Shares | Weighted- Average Exercise Price |  | Number of Shares | Weighted- Average Grant Date Fair Value
Balances as of December 31, 2021 | 81 |  |  | 24 |  | $ | 19.69 |  |  | 37 |  | $ | 61.22 |
Granted | (13) |  |  | 1 |  | 161.70 |  |  | 12 |  | 135.09 |
Increase in shares available for grant | 32 |  |  | — |  | — |  |  | — |  | — |
Exercised/Vested | 5 |  |  | (3) |  | 14.32 |  |  | (12) |  | 83.12 |
Canceled | 3 |  |  | — |  | 95.93 |  |  | (3) |  | 101.58 |
Balances as of December 31, 2022 | 108 |  |  | 22 |  | 23.41 |  |  | 34 |  | 77.07 |
Granted | (13) |  |  | 1 |  | 115.15 |  |  | 12 |  | 122.84 |
Increase in shares available for grant | 32 |  |  | — |  | — |  |  | — |  | — |
Exercised/Vested | 5 |  |  | (16) |  | 5.37 |  |  | (14) |  | 93.25 |
Canceled | 2 |  |  | — |  | 98.60 |  |  | (2) |  | 120.36 |
Balances as of December 31, 2023 | 134 |  |  | 7 |  | $ | 71.76 |  |  | 30 |  | $ | 85.35 |
| Number of Shares | Weighted- Average Exercise Price | Weighted- Average Remaining Contractual Life (years) | Aggregate Intrinsic Value
Options outstanding as of December 31, 2022 | 22 |  | $ | 23.41 |  | 2.78 | $ | 1,432 |
Options exercisable as of December 31, 2022 | 20 |  | 17.01 |  | 2.27 | 1,380 |
Options outstanding as of December 31, 2023 | 7 |  | 71.76 |  | 5.77 | 500 |
Options exercisable as of December 31, 2023 | 6 |  | 60.89 |  | 5.11 | 448 |
Schedule of RSU Activity | A summary of stock option and RSU activity under the Plans was as follows (in millions, except per share amounts):
|  |  | Outstanding Stock Options |  | Outstanding Restricted Stock Units
| Shares Available for Grant |  | Number of Shares | Weighted- Average Exercise Price |  | Number of Shares | Weighted- Average Grant Date Fair Value
Balances as of December 31, 2021 | 81 |  |  | 24 |  | $ | 19.69 |  |  | 37 |  | $ | 61.22 |
Granted | (13) |  |  | 1 |  | 161.70 |  |  | 12 |  | 135.09 |
Increase in shares available for grant | 32 |  |  | — |  | — |  |  | — |  | — |
Exercised/Vested | 5 |  |  | (3) |  | 14.32 |  |  | (12) |  | 83.12 |
Canceled | 3 |  |  | — |  | 95.93 |  |  | (3) |  | 101.58 |
Balances as of December 31, 2022 | 108 |  |  | 22 |  | 23.41 |  |  | 34 |  | 77.07 |
Granted | (13) |  |  | 1 |  | 115.15 |  |  | 12 |  | 122.84 |
Increase in shares available for grant | 32 |  |  | — |  | — |  |  | — |  | — |
Exercised/Vested | 5 |  |  | (16) |  | 5.37 |  |  | (14) |  | 93.25 |
Canceled | 2 |  |  | — |  | 98.60 |  |  | (2) |  | 120.36 |
Balances as of December 31, 2023 | 134 |  |  | 7 |  | $ | 71.76 |  |  | 30 |  | $ | 85.35 |
| Number of Shares | Weighted- Average Exercise Price | Weighted- Average Remaining Contractual Life (years) | Aggregate Intrinsic Value
Options outstanding as of December 31, 2022 | 22 |  | $ | 23.41 |  | 2.78 | $ | 1,432 |
Options exercisable as of December 31, 2022 | 20 |  | 17.01 |  | 2.27 | 1,380 |
Options outstanding as of December 31, 2023 | 7 |  | 71.76 |  | 5.77 | 500 |
Options exercisable as of December 31, 2023 | 6 |  | 60.89 |  | 5.11 | 448 |
Schedule of Transactions under Employee Stock Purchase Plan | The following table summarizes transactions under the Company’s ESPP (in millions except per share amounts):
|  | Year Ended December 31,
|  | 2022 | 2023
Shares issued |  | 0.5 |  | 0.7 |
Weighted-average price per share |  | $ | 95.90 |  | $ | 88.81 |
Cash proceeds |  | $ | 48 |  | $ | 64 |

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