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Investments - Schedule of Investment in CMLs by Loan to Value and Debt Service Coverage Ratios (Details) - Commercial Mortgage Loans - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Schedule of Investments [Line Items]    
Loans $ 2,574 $ 2,528
% of Total 100.00% 100.00%
Credit Quality Indicator Current Year [Abstract]    
2024 $ 56 $ 213
2023 216 288
2022 289 1,256
2021 1,253 512
2020 515 0
Prior 245 259
Total 2,574 2,528
Credit Quality Indicator Prior Year [Abstract]    
2023 56 213
2022 216 288
2021 289 1,256
2020 1,253 512
2019 515 0
Prior 245 259
Total 2,574 2,528
Loans under development, amortized cost 22 22
Loans under development, fair value 22 22
Fair Value    
Schedule of Investments [Line Items]    
Loans $ 2,254 $ 2,231
% of Total 100.00% 100.00%
Credit Quality Indicator Current Year [Abstract]    
Total $ 2,254 $ 2,231
Credit Quality Indicator Prior Year [Abstract]    
Total 2,254 2,231
Less than 50.00%    
Schedule of Investments [Line Items]    
Loans $ 526 $ 533
% of Total 20.00% 21.00%
Credit Quality Indicator Current Year [Abstract]    
2024 $ 0 $ 85
2023 88 17
2022 18 77
2021 74 232
2020 235 0
Prior 111 122
Total 526 533
Credit Quality Indicator Prior Year [Abstract]    
2023 0 85
2022 88 17
2021 18 77
2020 74 232
2019 235 0
Prior 111 122
Total 526 533
Less than 50.00% | Fair Value    
Schedule of Investments [Line Items]    
Loans $ 507 $ 510
% of Total 22.00% 23.00%
Credit Quality Indicator Current Year [Abstract]    
Total $ 507 $ 510
Credit Quality Indicator Prior Year [Abstract]    
Total 507 510
50.00% to 59.99%    
Schedule of Investments [Line Items]    
Loans $ 817 $ 764
% of Total 32.00% 30.00%
Credit Quality Indicator Current Year [Abstract]    
2024 $ 56 $ 53
2023 53 149
2022 149 267
2021 267 158
2020 158 0
Prior 134 137
Total 817 764
Credit Quality Indicator Prior Year [Abstract]    
2023 56 53
2022 53 149
2021 149 267
2020 267 158
2019 158 0
Prior 134 137
Total 817 764
50.00% to 59.99% | Fair Value    
Schedule of Investments [Line Items]    
Loans $ 725 $ 679
% of Total 32.00% 30.00%
Credit Quality Indicator Current Year [Abstract]    
Total $ 725 $ 679
Credit Quality Indicator Prior Year [Abstract]    
Total 725 679
60.00% to 74.99%    
Schedule of Investments [Line Items]    
Loans $ 1,216 $ 1,216
% of Total 47.00% 48.00%
Credit Quality Indicator Current Year [Abstract]    
2024 $ 0 $ 69
2023 69 113
2022 113 912
2021 912 122
2020 122 0
Prior 0 0
Total 1,216 1,216
Credit Quality Indicator Prior Year [Abstract]    
2023 0 69
2022 69 113
2021 113 912
2020 912 122
2019 122 0
Prior 0 0
Total 1,216 1,216
60.00% to 74.99% | Fair Value    
Schedule of Investments [Line Items]    
Loans $ 1,007 $ 1,028
% of Total 45.00% 46.00%
Credit Quality Indicator Current Year [Abstract]    
Total $ 1,007 $ 1,028
Credit Quality Indicator Prior Year [Abstract]    
Total 1,007 1,028
75.00% to 84.99%    
Schedule of Investments [Line Items]    
Loans $ 15 $ 15
% of Total 1.00% 1.00%
Credit Quality Indicator Current Year [Abstract]    
2024 $ 0 $ 6
2023 6 9
2022 9 0
2021 0 0
2020 0 0
Prior 0 0
Total 15 15
Credit Quality Indicator Prior Year [Abstract]    
2023 0 6
2022 6 9
2021 9 0
2020 0 0
2019 0 0
Prior 0 0
Total 15 15
75.00% to 84.99% | Fair Value    
Schedule of Investments [Line Items]    
Loans $ 15 $ 14
% of Total 1.00% 1.00%
Credit Quality Indicator Current Year [Abstract]    
Total $ 15 $ 14
Credit Quality Indicator Prior Year [Abstract]    
Total 15 14
Greater than 1.25    
Schedule of Investments [Line Items]    
Loans 2,425 2,443
Credit Quality Indicator Current Year [Abstract]    
2024 0 154
2023 156 276
2022 278 1,256
2021 1,241 512
2020 515 0
Prior 235 245
Total 2,425 2,443
Credit Quality Indicator Prior Year [Abstract]    
2023 0 154
2022 156 276
2021 278 1,256
2020 1,241 512
2019 515 0
Prior 235 245
Total 2,425 2,443
Greater than 1.25 | Less than 50.00%    
Schedule of Investments [Line Items]    
Loans 516 519
Credit Quality Indicator Current Year [Abstract]    
Total 516 519
Credit Quality Indicator Prior Year [Abstract]    
Total 516 519
Greater than 1.25 | 50.00% to 59.99%    
Schedule of Investments [Line Items]    
Loans 750 764
Credit Quality Indicator Current Year [Abstract]    
Total 750 764
Credit Quality Indicator Prior Year [Abstract]    
Total 750 764
Greater than 1.25 | 60.00% to 74.99%    
Schedule of Investments [Line Items]    
Loans 1,159 1,160
Credit Quality Indicator Current Year [Abstract]    
Total 1,159 1,160
Credit Quality Indicator Prior Year [Abstract]    
Total 1,159 1,160
Greater than 1.25 | 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    
Schedule of Investments [Line Items]    
Loans 119 66
Credit Quality Indicator Current Year [Abstract]    
2024 56 59
2023 60 3
2022 3 0
2021 0 0
2020 0 0
Prior 0 4
Total 119 66
Credit Quality Indicator Prior Year [Abstract]    
2023 56 59
2022 60 3
2021 3 0
2020 0 0
2019 0 0
Prior 0 4
Total 119 66
Greater than 1.00 but less than 1.25 | Less than 50.00%    
Schedule of Investments [Line Items]    
Loans 0 4
Credit Quality Indicator Current Year [Abstract]    
Total 0 4
Credit Quality Indicator Prior Year [Abstract]    
Total 0 4
Greater than 1.00 but less than 1.25 | 50.00% to 59.99%    
Schedule of Investments [Line Items]    
Loans 56 0
Credit Quality Indicator Current Year [Abstract]    
Total 56 0
Credit Quality Indicator Prior Year [Abstract]    
Total 56 0
Greater than 1.00 but less than 1.25 | 60.00% to 74.99%    
Schedule of Investments [Line Items]    
Loans 57 56
Credit Quality Indicator Current Year [Abstract]    
Total 57 56
Credit Quality Indicator Prior Year [Abstract]    
Total 57 56
Greater than 1.00 but less than 1.25 | 75.00% to 84.99%    
Schedule of Investments [Line Items]    
Loans 6 6
Credit Quality Indicator Current Year [Abstract]    
Total 6 6
Credit Quality Indicator Prior Year [Abstract]    
Total 6 6
Less than 1.00    
Schedule of Investments [Line Items]    
Loans 30 19
Credit Quality Indicator Current Year [Abstract]    
2024 0 0
2023 0 9
2022 8 0
2021 12 0
2020 0 0
Prior 10 10
Total 30 19
Credit Quality Indicator Prior Year [Abstract]    
2023 0 0
2022 0 9
2021 8 0
2020 12 0
2019 0 0
Prior 10 10
Total 30 19
Less than 1.00 | Less than 50.00%    
Schedule of Investments [Line Items]    
Loans 10 10
Credit Quality Indicator Current Year [Abstract]    
Total 10 10
Credit Quality Indicator Prior Year [Abstract]    
Total 10 10
Less than 1.00 | 50.00% to 59.99%    
Schedule of Investments [Line Items]    
Loans 11 0
Credit Quality Indicator Current Year [Abstract]    
Total 11 0
Credit Quality Indicator Prior Year [Abstract]    
Total 11 0
Less than 1.00 | 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
Less than 1.00 | 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