Stock-based compensation - Schedule of Share-Based Compensation Expense Recognized in Consolidated Statements of Operations and Comprehensive Income (Loss) (Details) - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
|
| Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | ||
| Total stock-based compensation | $ 106 | $ 72 |
| Stock options | ||
| Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | ||
| Total stock-based compensation | 1 | 3 |
| Service-based RSUs | ||
| Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | ||
| Total stock-based compensation | 96 | 42 |
| Performance-based RSUs | ||
| Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | ||
| Total stock-based compensation | $ 9 | $ 27 |