Stock-based compensation - Schedule of Stock-based Compensation Expense in the Consolidated Statements of Operations and Comprehensive Income (Details) - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
|
| Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | ||
| Total stock-based compensation expense | $ 30 | $ 40 |
| Cost of operations | ||
| Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | ||
| Total stock-based compensation expense | 3 | 1 |
| General and administrative expense | ||
| Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | ||
| Total stock-based compensation expense | 27 | 36 |
| Acquisition, transaction, and other expense | ||
| Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | ||
| Total stock-based compensation expense | $ 0 | $ 3 |