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Fair Value of Financial Instruments - Schedule of Mortgage Loans With Election of Fair Value Option (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value | $ 263 | $ 288
Commercial |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value | 263 | 288
Aggregate contractual principal | $ 297 | $ 326

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