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Fair Value - Schedule of Fair Value Option Mortgage Loans (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Fair Value, Option, Quantitative Disclosures [Line Items]    
Mortgage loans $ (53) $ (41)
Mortgage Loans    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Unpaid principal balance 50,752 33,653
Mark to fair value (3,183) (2,842)
Fair value 47,569 30,811
Commercial Mortgage    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Unpaid principal balance of commercial mortgage loans 90 days or more past due and/or in non-accrual status 221 74
Mark to fair value of commercial mortgage loans 90 days or more past due and/or in non-accrual status (74) (55)
Fair value of commercial mortgage loans 90 days or more past due and/or in non-accrual status 147 19
Fair value of commercial mortgage loans 90 days or more past due 64 2
Fair value of commercial mortgage loans in non-accrual status 147 19
Residential Mortgage Loan    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Unpaid principal balance of commercial mortgage loans 90 days or more past due and/or in non-accrual status 528 522
Mark to fair value of commercial mortgage loans 90 days or more past due and/or in non-accrual status (49) (50)
Fair value of commercial mortgage loans 90 days or more past due and/or in non-accrual status 479 472
Fair value of commercial mortgage loans 90 days or more past due 479 472
Fair value of commercial mortgage loans in non-accrual status 355 360
Residential Mortgage Loan | Government-Guaranteed Collateral    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value of commercial mortgage loans 90 days or more past due $ 124 $ 221