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Investments - Mortgage Loans Credit Ratings Indicator (Details) - Commercial Real Estate - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans $ 1,487 $ 1,311
1    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans 8 11
2 to 4    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans 1,419 1,262
5 and 6    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans 60 32
7    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans 0 6
2024    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans 255  
2024 | 1    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans 0  
2024 | 2 to 4    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans 255  
2024 | 5 and 6    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans 0  
2024 | 7    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans 0  
2023    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans 301 302
2023 | 1    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans 0 0
2023 | 2 to 4    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans 301 302
2023 | 5 and 6    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans 0 0
2023 | 7    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans 0 0
2022    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans 339 346
2022 | 1    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans 0 0
2022 | 2 to 4    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans 334 346
2022 | 5 and 6    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans 5 0
2022 | 7    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans 0 0
2021    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans 219 244
2021 | 1    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans 0 0
2021 | 2 to 4    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans 206 225
2021 | 5 and 6    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans 13 13
2021 | 7    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans 0 6
2020    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans 35 35
2020 | 1    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans 0 0
2020 | 2 to 4    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans 35 35
2020 | 5 and 6    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans 0 0
2020 | 7    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans 0 0
Prior    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans 338 384
Prior | 1    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans 8 11
Prior | 2 to 4    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans 288 354
Prior | 5 and 6    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans 42 19
Prior | 7    
Mortgage Loans on Real Estate [Line Items]    
Mortgage loans $ 0 $ 0