Redeemable Convertible Preferred Stock, Redeemable Common Stock, and Stockholders Equity (Deficit) - Stock-Based Compensation Expense (Q2) (Details) - USD ($) $ in Millions |
6 Months Ended | 12 Months Ended |
|---|---|---|
Jun. 30, 2025 |
Dec. 31, 2024 |
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| Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] | ||
| Unrecognized compensation costs, stock options | $ 73 | |
| Stock Options | ||
| Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] | ||
| Unrecognized compensation costs, stock options | $ 91 | |
| Unrecognized cost, recognition period | 2 years | 3 years |
| Restricted Stock Units (RSUs) | ||
| Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] | ||
| Unrecognized compensation costs, stock options | $ 600 | |
| Unrecognized cost, recognition period | 3 years | 2 years |
| Unrecognized compensation costs | $ 1,100 |
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of cost to be recognized for option under share-based payment arrangement. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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