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Fair Value of Financial Instruments - Schedule of Mortgage Loans With Election of Fair Value Option (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value $ 258 $ 288
Commercial    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value 258 288
Aggregate contractual principal $ 292 $ 326