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Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Property and Equipment |  |  |  |
Advertising expenses | $ 136 | $ 217 | $ 277 | $ 426
Research and Development |  |  |  |
Research and development costs | $ 14 | $ 16 | $ 30 | $ 34

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