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Variable Interest Entities (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Variable Interest Entity [Line Items]    
Total VIE Assets $ 51,103 $ 47,990
Maximum Exposure to Loss - On-Balance Sheet (Asset) Liability 5 2
Variable Interest Entity, Maximum Exposure to Loss, Off Balance Sheet 24 27
Variable Interest Entity, Not Primary Beneficiary    
Variable Interest Entity [Line Items]    
Total VIE Assets 3,339 3,595
Remaining Coverage, Amount 393  
Variable Interest Entity, Not Primary Beneficiary | 2017-1 Ltd. (Oct-17)    
Variable Interest Entity [Line Items]    
Total VIE Assets 0 37
Variable Interest Entity, Not Primary Beneficiary | 2018-1 Ltd. (Apr-18)    
Variable Interest Entity [Line Items]    
Total VIE Assets 78 90
Variable Interest Entity, Not Primary Beneficiary | 2018-3 Ltd. (Oct-18)    
Variable Interest Entity [Line Items]    
Total VIE Assets 183 199
Variable Interest Entity, Not Primary Beneficiary | 2019-1 Ltd. (Mar-19)    
Variable Interest Entity [Line Items]    
Total VIE Assets 99 108
Variable Interest Entity, Not Primary Beneficiary | 2019-2 Ltd. (Apr-19)    
Variable Interest Entity [Line Items]    
Total VIE Assets 307 325
Variable Interest Entity, Not Primary Beneficiary | 2019-3 Ltd. (Jul-19)    
Variable Interest Entity [Line Items]    
Total VIE Assets 182 223
Variable Interest Entity, Not Primary Beneficiary | 2019-4 Ltd. (Oct-19)    
Variable Interest Entity [Line Items]    
Total VIE Assets 252 266
Variable Interest Entity, Not Primary Beneficiary | 2020-2 Ltd. (Sep-20)    
Variable Interest Entity [Line Items]    
Total VIE Assets 89 105
Variable Interest Entity, Not Primary Beneficiary | 2020-3 Ltd. (Nov-20)    
Variable Interest Entity [Line Items]    
Total VIE Assets 224 244
Remaining Coverage, Amount [1] 6  
Variable Interest Entity, Not Primary Beneficiary | 2020-4 Ltd. (Dec-20)    
Variable Interest Entity [Line Items]    
Total VIE Assets 87 98
Remaining Coverage, Amount [1] 3  
Variable Interest Entity, Not Primary Beneficiary | 2021-1 Ltd. (Mar-21)    
Variable Interest Entity [Line Items]    
Total VIE Assets 438 467
Remaining Coverage, Amount [1] 29  
Variable Interest Entity, Not Primary Beneficiary | 2021-2 Ltd. (Jun-21)    
Variable Interest Entity [Line Items]    
Total VIE Assets 434 458
Remaining Coverage, Amount [1] 71  
Variable Interest Entity, Not Primary Beneficiary | 2021-3 Ltd. (Sep-21)    
Variable Interest Entity [Line Items]    
Total VIE Assets 481 490
Remaining Coverage, Amount [1] 125  
Variable Interest Entity, Not Primary Beneficiary | 2022-1 Ltd. (Jan-22)    
Variable Interest Entity [Line Items]    
Total VIE Assets 284 284
Remaining Coverage, Amount [1] 33  
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  
[1] Coverage from a separate panel of reinsurers remaining at March 31, 2023.