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Investments - Schedule of Investment in CMLs by Loan to Value and Debt Service Coverage Ratios (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Credit Quality Indicator Prior Year [Abstract]    
Loans under development, amortized cost   $ 22
Loans under development, fair value   22
Commercial mortgage    
Schedule of Investments [Line Items]    
Loans $ 2,722 $ 2,528
% of Total 100.00% 100.00%
Credit Quality Indicator Current Year [Abstract]    
2024 $ 273 $ 213
2023 227 288
2022 290 1,256
2021 1,253 512
2020 469 0
Prior 210 259
Total 2,722 2,528
Credit Quality Indicator Prior Year [Abstract]    
2023 273 213
2022 227 288
2021 290 1,256
2020 1,253 512
2019 469 0
Prior 210 259
Total 2,722 2,528
Commercial mortgage | Total Estimated Fair Value    
Schedule of Investments [Line Items]    
Loans $ 2,404 $ 2,231
% of Total 100.00% 100.00%
Credit Quality Indicator Current Year [Abstract]    
Total $ 2,404 $ 2,231
Credit Quality Indicator Prior Year [Abstract]    
Total 2,404 2,231
Commercial mortgage | Less than 50.00%    
Schedule of Investments [Line Items]    
Loans $ 524 $ 533
% of Total 19.00% 21.00%
Credit Quality Indicator Current Year [Abstract]    
2024 $ 66 $ 85
2023 99 17
2022 19 77
2021 74 232
2020 189 0
Prior 77 122
Total 524 533
Credit Quality Indicator Prior Year [Abstract]    
2023 66 85
2022 99 17
2021 19 77
2020 74 232
2019 189 0
Prior 77 122
Total 524 533
Commercial mortgage | Less than 50.00% | Total Estimated Fair Value    
Schedule of Investments [Line Items]    
Loans $ 501 $ 510
% of Total 21.00% 23.00%
Credit Quality Indicator Current Year [Abstract]    
Total $ 501 $ 510
Credit Quality Indicator Prior Year [Abstract]    
Total 501 510
Commercial mortgage | 50.00% to 59.99%    
Schedule of Investments [Line Items]    
Loans $ 927 $ 764
% of Total 34.00% 30.00%
Credit Quality Indicator Current Year [Abstract]    
2024 $ 112 $ 53
2023 53 149
2022 149 267
2021 321 158
2020 159 0
Prior 133 137
Total 927 764
Credit Quality Indicator Prior Year [Abstract]    
2023 112 53
2022 53 149
2021 149 267
2020 321 158
2019 159 0
Prior 133 137
Total 927 764
Commercial mortgage | 50.00% to 59.99% | Total Estimated Fair Value    
Schedule of Investments [Line Items]    
Loans $ 826 $ 679
% of Total 34.00% 30.00%
Credit Quality Indicator Current Year [Abstract]    
Total $ 826 $ 679
Credit Quality Indicator Prior Year [Abstract]    
Total 826 679
Commercial mortgage | 60.00% to 74.99%    
Schedule of Investments [Line Items]    
Loans $ 1,254 $ 1,216
% of Total 46.00% 48.00%
Credit Quality Indicator Current Year [Abstract]    
2024 $ 91 $ 69
2023 71 113
2022 113 912
2021 858 122
2020 121 0
Prior 0 0
Total 1,254 1,216
Credit Quality Indicator Prior Year [Abstract]    
2023 91 69
2022 71 113
2021 113 912
2020 858 122
2019 121 0
Prior 0 0
Total 1,254 1,216
Commercial mortgage | 60.00% to 74.99% | Total Estimated Fair Value    
Schedule of Investments [Line Items]    
Loans $ 1,060 $ 1,028
% of Total 44.00% 46.00%
Credit Quality Indicator Current Year [Abstract]    
Total $ 1,060 $ 1,028
Credit Quality Indicator Prior Year [Abstract]    
Total 1,060 1,028
Commercial mortgage | 75.00% to 84.99%    
Schedule of Investments [Line Items]    
Loans $ 17 $ 15
% of Total 1.00% 1.00%
Credit Quality Indicator Current Year [Abstract]    
2024 $ 4 $ 6
2023 4 9
2022 9 0
2021 0 0
2020 0 0
Prior 0 0
Total 17 15
Credit Quality Indicator Prior Year [Abstract]    
2023 4 6
2022 4 9
2021 9 0
2020 0 0
2019 0 0
Prior 0 0
Total 17 15
Commercial mortgage | 75.00% to 84.99% | Total Estimated Fair Value    
Schedule of Investments [Line Items]    
Loans $ 17 $ 14
% of Total 1.00% 1.00%
Credit Quality Indicator Current Year [Abstract]    
Total $ 17 $ 14
Credit Quality Indicator Prior Year [Abstract]    
Total 17 14
Greater than 1.25 | Commercial mortgage    
Schedule of Investments [Line Items]    
Loans 2,535 2,443
Credit Quality Indicator Current Year [Abstract]    
2024 140 154
2023 215 276
2022 278 1,256
2021 1,241 512
2020 469 0
Prior 192 245
Total 2,535 2,443
Credit Quality Indicator Prior Year [Abstract]    
2023 140 154
2022 215 276
2021 278 1,256
2020 1,241 512
2019 469 0
Prior 192 245
Total 2,535 2,443
Greater than 1.25 | Commercial mortgage | Less than 50.00%    
Schedule of Investments [Line Items]    
Loans 490 519
Credit Quality Indicator Current Year [Abstract]    
Total 490 519
Credit Quality Indicator Prior Year [Abstract]    
Total 490 519
Greater than 1.25 | Commercial mortgage | 50.00% to 59.99%    
Schedule of Investments [Line Items]    
Loans 803 764
Credit Quality Indicator Current Year [Abstract]    
Total 803 764
Credit Quality Indicator Prior Year [Abstract]    
Total 803 764
Greater than 1.25 | Commercial mortgage | 60.00% to 74.99%    
Schedule of Investments [Line Items]    
Loans 1,238 1,160
Credit Quality Indicator Current Year [Abstract]    
Total 1,238 1,160
Credit Quality Indicator Prior Year [Abstract]    
Total 1,238 1,160
Greater than 1.25 | Commercial mortgage | 75.00% to 84.99%    
Schedule of Investments [Line Items]    
Loans 4 0
Credit Quality Indicator Current Year [Abstract]    
Total 4 0
Credit Quality Indicator Prior Year [Abstract]    
Total 4 0
Greater than 1.00 but less than 1.25 | Commercial mortgage    
Schedule of Investments [Line Items]    
Loans 166 66
Credit Quality Indicator Current Year [Abstract]    
2024 133 59
2023 12 3
2022 3 0
2021 0 0
2020 0 0
Prior 18 4
Total 166 66
Credit Quality Indicator Prior Year [Abstract]    
2023 133 59
2022 12 3
2021 3 0
2020 0 0
2019 0 0
Prior 18 4
Total 166 66
Greater than 1.00 but less than 1.25 | Commercial mortgage | Less than 50.00%    
Schedule of Investments [Line Items]    
Loans 34 4
Credit Quality Indicator Current Year [Abstract]    
Total 34 4
Credit Quality Indicator Prior Year [Abstract]    
Total 34 4
Greater than 1.00 but less than 1.25 | Commercial mortgage | 50.00% to 59.99%    
Schedule of Investments [Line Items]    
Loans 112 0
Credit Quality Indicator Current Year [Abstract]    
Total 112 0
Credit Quality Indicator Prior Year [Abstract]    
Total 112 0
Greater than 1.00 but less than 1.25 | Commercial mortgage | 60.00% to 74.99%    
Schedule of Investments [Line Items]    
Loans 16 56
Credit Quality Indicator Current Year [Abstract]    
Total 16 56
Credit Quality Indicator Prior Year [Abstract]    
Total 16 56
Greater than 1.00 but less than 1.25 | Commercial mortgage | 75.00% to 84.99%    
Schedule of Investments [Line Items]    
Loans 4 6
Credit Quality Indicator Current Year [Abstract]    
Total 4 6
Credit Quality Indicator Prior Year [Abstract]    
Total 4 6
Greater than 1.00 | Commercial mortgage    
Schedule of Investments [Line Items]    
Loans 21 19
Credit Quality Indicator Current Year [Abstract]    
Total 21 19
Credit Quality Indicator Prior Year [Abstract]    
Total 21 19
Greater than 1.00 | Commercial mortgage | Less than 50.00%    
Schedule of Investments [Line Items]    
Loans 0 10
Credit Quality Indicator Current Year [Abstract]    
Total 0 10
Credit Quality Indicator Prior Year [Abstract]    
Total 0 10
Greater than 1.00 | Commercial mortgage | 50.00% to 59.99%    
Schedule of Investments [Line Items]    
Loans 12 0
Credit Quality Indicator Current Year [Abstract]    
Total 12 0
Credit Quality Indicator Prior Year [Abstract]    
Total 12 0
Greater than 1.00 | Commercial mortgage | 60.00% to 74.99%    
Schedule of Investments [Line Items]    
Loans 0 0
Credit Quality Indicator Current Year [Abstract]    
Total 0 0
Credit Quality Indicator Prior Year [Abstract]    
Total 0 0
Greater than 1.00 | Commercial mortgage | 75.00% to 84.99%    
Schedule of Investments [Line Items]    
Loans 9 9
Credit Quality Indicator Current Year [Abstract]    
Total 9 9
Credit Quality Indicator Prior Year [Abstract]    
Total 9 9
Less than 1.00 | Commercial mortgage    
Schedule of Investments [Line Items]    
Loans 21 19
Credit Quality Indicator Current Year [Abstract]    
2024 0 0
2023 0 9
2022 9 0
2021 12 0
2020 0 0
Prior 0 10
Total 21 19
Credit Quality Indicator Prior Year [Abstract]    
2023 0 0
2022 0 9
2021 9 0
2020 12 0
2019 0 0
Prior 0 10
Total $ 21 $ 19