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Fair Value of Assets and Liabilities - Schedule of Financial Instruments Not Carried at Fair Value (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024 | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | --- | --- | ---
Financial assets |  |  |  |
Mortgage loans | $ 770 | $ 784 |  |
Financial liabilities |  |  |  |
Debt | 8,086 | 8,085 |  |
Liability for collateral | 2,137 | 2,041 | $ 2,049 | $ 1,891
Liabilities held for sale | 2,375 | 2,113 |  |
Significant unobservable inputs (Level 3) | Amortized cost, net |  |  |  |
Financial assets |  |  |  |
Mortgage loans | 770 | 784 |  |
Bank loans | 274 | 201 |  |
Financial liabilities |  |  |  |
Liabilities held for sale | 39 | 40 |  |
Significant unobservable inputs (Level 3) | Fair value |  |  |  |
Financial assets |  |  |  |
Mortgage loans | 741 | 746 |  |
Bank loans | 279 | 207 |  |
Financial liabilities |  |  |  |
Liabilities held for sale | 39 | 40 |  |
Significant other observable inputs (Level 2) | Amortized cost, net |  |  |  |
Financial liabilities |  |  |  |
Debt | 8,086 | 8,085 |  |
Liability for collateral | 2,137 | 2,041 |  |
Significant other observable inputs (Level 2) | Fair value |  |  |  |
Financial liabilities |  |  |  |
Debt | 7,813 | 7,740 |  |
Liability for collateral | $ 2,137 | $ 2,041 |  |

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