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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, 2023
Dec. 31, 2022
Credit Quality Indicator Prior Year [Abstract]    
Loans under development, amortized cost   $ 9
Loans under development, fair value   9
Commercial Mortgage    
Schedule of Investments [Line Items]    
Loans $ 2,528 $ 2,407
% of Total 100.00% 100.00%
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
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 | Total Estimated Fair Value    
Schedule of Investments [Line Items]    
Loans $ 2,231 $ 2,074
% of Total 100.00% 100.00%
Credit Quality Indicator Current Year [Abstract]    
Total $ 2,231 $ 2,074
Credit Quality Indicator Prior Year [Abstract]    
Total 2,231 2,074
Commercial Mortgage | Less than 50.00%    
Schedule of Investments [Line Items]    
Loans $ 533 $ 526
% of Total 21.00% 22.00%
Credit Quality Indicator Current Year [Abstract]    
2023 $ 85 $ 70
2022 17 120
2021 77 207
2020 232 0
2019 0 0
Prior 122 129
Total 533 526
Credit Quality Indicator Prior Year [Abstract]    
2022 85 70
2021 17 120
2020 77 207
2019 232 0
2018 0 0
Prior 122 129
Total 533 526
Commercial Mortgage | Less than 50.00% | Total Estimated Fair Value    
Schedule of Investments [Line Items]    
Loans $ 510 $ 490
% of Total 23.00% 24.00%
Credit Quality Indicator Current Year [Abstract]    
Total $ 510 $ 490
Credit Quality Indicator Prior Year [Abstract]    
Total 510 490
Commercial Mortgage | 50.00% to 59.99%    
Schedule of Investments [Line Items]    
Loans $ 764 $ 706
% of Total 30.00% 29.00%
Credit Quality Indicator Current Year [Abstract]    
2023 $ 53 $ 149
2022 149 268
2021 267 158
2020 158 0
2019 0 0
Prior 137 131
Total 764 706
Credit Quality Indicator Prior Year [Abstract]    
2022 53 149
2021 149 268
2020 267 158
2019 158 0
2018 0 0
Prior 137 131
Total 764 706
Commercial Mortgage | 50.00% to 59.99% | Total Estimated Fair Value    
Schedule of Investments [Line Items]    
Loans $ 679 $ 615
% of Total 30.00% 30.00%
Credit Quality Indicator Current Year [Abstract]    
Total $ 679 $ 615
Credit Quality Indicator Prior Year [Abstract]    
Total 679 615
Commercial Mortgage | 60.00% to 74.99%    
Schedule of Investments [Line Items]    
Loans $ 1,216 $ 1,157
% of Total 48.00% 48.00%
Credit Quality Indicator Current Year [Abstract]    
2023 $ 69 $ 113
2022 113 912
2021 912 123
2020 122 0
2019 0 0
Prior 0 9
Total 1,216 1,157
Credit Quality Indicator Prior Year [Abstract]    
2022 69 113
2021 113 912
2020 912 123
2019 122 0
2018 0 0
Prior 0 9
Total 1,216 1,157
Commercial Mortgage | 60.00% to 74.99% | Total Estimated Fair Value    
Schedule of Investments [Line Items]    
Loans $ 1,028 $ 955
% of Total 46.00% 45.00%
Credit Quality Indicator Current Year [Abstract]    
Total $ 1,028 $ 955
Credit Quality Indicator Prior Year [Abstract]    
Total 1,028 955
Commercial Mortgage | 75.00% to 84.99%    
Schedule of Investments [Line Items]    
Loans $ 15 $ 18
% of Total 1.00% 1.00%
Credit Quality Indicator Current Year [Abstract]    
2023 $ 6 $ 9
2022 9 0
2021 0 0
2020 0 0
2019 0 0
Prior 0 9
Total 15 18
Credit Quality Indicator Prior Year [Abstract]    
2022 6 9
2021 9 0
2020 0 0
2019 0 0
2018 0 0
Prior 0 9
Total 15 18
Commercial Mortgage | 75.00% to 84.99% | Total Estimated Fair Value    
Schedule of Investments [Line Items]    
Loans $ 14 $ 14
% of Total 1.00% 1.00%
Credit Quality Indicator Current Year [Abstract]    
Total $ 14 $ 14
Credit Quality Indicator Prior Year [Abstract]    
Total 14 14
Greater than 1.25 | Commercial Mortgage    
Schedule of Investments [Line Items]    
Loans 2,443 2,371
Credit Quality Indicator Current Year [Abstract]    
2023 154 329
2022 276 1,300
2021 1,256 488
2020 512 0
2019 0 0
Prior 245 254
Total 2,443 2,371
Credit Quality Indicator Prior Year [Abstract]    
2022 154 329
2021 276 1,300
2020 1,256 488
2019 512 0
2018 0 0
Prior 245 254
Total 2,443 2,371
Greater than 1.25 | Commercial Mortgage | Less than 50.00%    
Schedule of Investments [Line Items]    
Loans 519 511
Credit Quality Indicator Current Year [Abstract]    
Total 519 511
Credit Quality Indicator Prior Year [Abstract]    
Total 519 511
Greater than 1.25 | Commercial Mortgage | 50.00% to 59.99%    
Schedule of Investments [Line Items]    
Loans 764 706
Credit Quality Indicator Current Year [Abstract]    
Total 764 706
Credit Quality Indicator Prior Year [Abstract]    
Total 764 706
Greater than 1.25 | Commercial Mortgage | 60.00% to 74.99%    
Schedule of Investments [Line Items]    
Loans 1,160 1,154
Credit Quality Indicator Current Year [Abstract]    
Total 1,160 1,154
Credit Quality Indicator Prior Year [Abstract]    
Total 1,160 1,154
Greater than 1.25 | Commercial Mortgage | 75.00% to 84.99%    
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 but less than 1.25 | Commercial Mortgage    
Schedule of Investments [Line Items]    
Loans 66 7
Credit Quality Indicator Current Year [Abstract]    
2023 59 3
2022 3 0
2021 0 0
2020 0 0
2019 0 0
Prior 4 4
Total 66 7
Credit Quality Indicator Prior Year [Abstract]    
2022 59 3
2021 3 0
2020 0 0
2019 0 0
2018 0 0
Prior 4 4
Total 66 7
Greater than 1.00 but less than 1.25 | Commercial Mortgage | Less than 50.00%    
Schedule of Investments [Line Items]    
Loans 4 4
Credit Quality Indicator Current Year [Abstract]    
Total 4 4
Credit Quality Indicator Prior Year [Abstract]    
Total 4 4
Greater than 1.00 but less than 1.25 | Commercial Mortgage | 50.00% to 59.99%    
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 but less than 1.25 | Commercial Mortgage | 60.00% to 74.99%    
Schedule of Investments [Line Items]    
Loans 56 3
Credit Quality Indicator Current Year [Abstract]    
Total 56 3
Credit Quality Indicator Prior Year [Abstract]    
Total 56 3
Greater than 1.00 but less than 1.25 | Commercial Mortgage | 75.00% to 84.99%    
Schedule of Investments [Line Items]    
Loans 6 0
Credit Quality Indicator Current Year [Abstract]    
Total 6 0
Credit Quality Indicator Prior Year [Abstract]    
Total 6 0
Greater than 1.00 | Commercial Mortgage    
Schedule of Investments [Line Items]    
Loans 19 29
Credit Quality Indicator Current Year [Abstract]    
Total 19 29
Credit Quality Indicator Prior Year [Abstract]    
Total 19 29
Greater than 1.00 | Commercial Mortgage | Less than 50.00%    
Schedule of Investments [Line Items]    
Loans 10 11
Credit Quality Indicator Current Year [Abstract]    
Total 10 11
Credit Quality Indicator Prior Year [Abstract]    
Total 10 11
Greater than 1.00 | Commercial Mortgage | 50.00% to 59.99%    
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 | 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 18
Credit Quality Indicator Current Year [Abstract]    
Total 9 18
Credit Quality Indicator Prior Year [Abstract]    
Total 9 18
Less than 1.00 | Commercial Mortgage    
Schedule of Investments [Line Items]    
Loans 19 29
Credit Quality Indicator Current Year [Abstract]    
2023 0 9
2022 9 0
2021 0 0
2020 0 0
2019 0 0
Prior 10 20
Total 19 29
Credit Quality Indicator Prior Year [Abstract]    
2022 0 9
2021 9 0
2020 0 0
2019 0 0
2018 0 0
Prior 10 20
Total $ 19 $ 29