Receivables, Prepayments and Other Assets - Schedule of Unbilled Accounts Receivable (Details) - USD ($) $ in Millions |
6 Months Ended | 12 Months Ended |
|---|---|---|
Jun. 30, 2026 |
Dec. 31, 2025 |
|
| Trade and other current receivables [abstract] | ||
| Balance, beginning of period | $ 81 | $ 38 |
| Revenue recognized during the period | 110 | 177 |
| Amounts invoiced | (88) | (135) |
| Other | 5 | 1 |
| Balance, end of period | $ 108 | $ 81 |