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Variable Interest Entities (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Variable Interest Entity [Line Items]    
Total VIE Assets $ 62,768 $ 58,906
Variable Interest Entity, Not Primary Beneficiary    
Variable Interest Entity [Line Items]    
Total VIE Assets 1,120 1,242
Remaining Coverage, Amount 304  
Variable Interest Entity, Not Primary Beneficiary | 2019-1 Ltd. (Mar-19)    
Variable Interest Entity [Line Items]    
Total VIE Assets 0 71
Variable Interest Entity, Not Primary Beneficiary | 2019-3 Ltd. (Jul-19)    
Variable Interest Entity [Line Items]    
Total VIE Assets 75 99
Variable Interest Entity, Not Primary Beneficiary | 2021-3 Ltd. (Sep-21)    
Variable Interest Entity [Line Items]    
Total VIE Assets 414 429
Remaining Coverage, Amount [1] 108  
Variable Interest Entity, Not Primary Beneficiary | 2022-1 Ltd. (Jan-22)    
Variable Interest Entity [Line Items]    
Total VIE Assets 244 256
Remaining Coverage, Amount [1] 23  
Variable Interest Entity, Not Primary Beneficiary | 2022-2 Ltd. (Sep-22)    
Variable Interest Entity [Line Items]    
Total VIE Assets 201 201
Remaining Coverage, Amount [1] 126  
Variable Interest Entity, Not Primary Beneficiary | 2023-1 Ltd. (Oct-23)    
Variable Interest Entity [Line Items]    
Total VIE Assets 186 $ 186
Remaining Coverage, Amount $ 47  
[1] Coverage from a separate panel of reinsurers remaining at March 31, 2024.