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Assets and Liabilities Measured at Fair Value - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2026 | Mar. 31, 2025 | Dec. 31, 2025
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Change in fair value of exchangeable senior debentures realized gain (loss) | $ 17 | $ 53 |
Cumulative amount of gain in change in fair value | $ 697 |  | $ 772
4% Exchangeable Senior Debentures due 2029 |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Interest rate (as a percent) | 4.00% |  | 4.00%
Repayment Of Long-Term Debt, Principal | $ 59 |  |
Repayment Of Long-Term Debt, Carrying Value | 3 |  |
Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, Reclassification Adjustment from AOCI for Derecognition, before Tax | $ 62 |  |
3.75% Exchangeable Senior Debentures due 2030 |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Interest rate (as a percent) | 3.75% |  | 3.75%
Repayment Of Long-Term Debt, Principal | $ 14 |  |
Repayment Of Long-Term Debt, Carrying Value | 1 |  |
Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, Reclassification Adjustment from AOCI for Derecognition, before Tax | $ 13 |  |

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