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Investments - Commercial Mortgage Loans Segregated by Aging of Loans and Charge Offs by Year of Origination (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Charge offs    
2023 $ 0  
2022 0  
2021 0  
2020 0  
2019 0  
Credit Quality Indicator Prior Year [Abstract]    
Loans under development, amortized cost   $ 9
Loans under development, fair value   9
Commercial Mortgage    
Credit Quality Indicator Current Year [Abstract]    
2023 213 341
2022 288 1,300
2021 1,256 488
2020 512 0
2019 0 0
Prior 259 278
Total 2,528 2,407
Charge offs    
Prior 3  
Total charge-offs 3  
Credit Quality Indicator Prior Year [Abstract]    
2022 213 341
2021 288 1,300
2020 1,256 488
2019 512 0
2018 0 0
Prior 259 278
Total 2,528 2,407
Loans under development, amortized cost 22  
Loans under development, fair value 22  
Commercial Mortgage | Current (less than 30 days past due)    
Credit Quality Indicator Current Year [Abstract]    
2023 213 341
2022 288 1,300
2021 1,256 488
2020 512 0
2019 0 0
Prior 259 269
Total 2,528 2,398
Credit Quality Indicator Prior Year [Abstract]    
2022 213 341
2021 288 1,300
2020 1,256 488
2019 512 0
2018 0 0
Prior 259 269
Total 2,528 2,398
Commercial Mortgage | 30-89 days past due    
Credit Quality Indicator Current Year [Abstract]    
2023 0 0
2022 0 0
2021 0 0
2020 0 0
2019 0 0
Prior 0 0
Total 0 0
Credit Quality Indicator Prior Year [Abstract]    
2022 0 0
2021 0 0
2020 0 0
2019 0 0
2018 0 0
Prior 0 0
Total 0 0
Commercial Mortgage | 90 days or more past due    
Credit Quality Indicator Current Year [Abstract]    
2023 0 0
2022 0 0
2021 0 0
2020 0 0
2019 0 0
Prior 0 9
Total 0 9
Credit Quality Indicator Prior Year [Abstract]    
2022 0 0
2021 0 0
2020 0 0
2019 0 0
2018 0 0
Prior 0 9
Total $ 0 $ 9