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Assets and Liabilities Measured at Fair Value (Tables) | 3 Months Ended
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Mar. 31, 2026
Fair Value Disclosures [Abstract] |
Schedule of Assets and Liabilities Measured at Fair Value | The Company's assets and liabilities measured at fair value on a recurring basis are as follows:
|  | Fair Value Measurements at March 31, 2026 |  | Fair Value Measurements at December 31, 2025
Description |  | Total |  | Quoted prices in active markets for identical assets (Level 1) |  | Significant other observable inputs (Level 2) |  | Total |  | Quoted prices in active markets for identical assets (Level 1) |  | Significant other observable inputs (Level 2)
|  | amounts in millions
Cash equivalents |  | $ | 238 |  |  | 238 |  |  | — |  |  | 816 |  |  | 816 |  |  | — |
Debt |  | $ | 36 |  |  | — |  |  | 36 |  |  | 52 |  |  | — |  |  | 52 |
Schedule of Realized and Unrealized Gains (Losses) on Financial Instruments | Realized and unrealized gains (losses) on financial instruments are comprised of changes in the fair value of the following:
| Three months ended March 31,
| 2026 |  | 2025
| amounts in millions
Equity securities | $ | (6) |  |  | — |
Exchangeable senior debentures | 85 |  |  | (15) |
| $ | 79 |  |  | (15) |

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Tabular disclosure of realized and unrealized gain (loss) on investment in security. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(9)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(7)(c)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 + Details
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