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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
Mar. 31, 2024
Dec. 31, 2023
Schedule of Investments [Line Items]    
Total $ 2,563 $ 2,528
% of Total 100.00% 100.00%
Loans under development, amortized cost $ 22 $ 22
Loans under development, fair value 22 22
Credit Quality Indicator Current Year [Abstract]    
2024 35 213
2023 214 288
2022 288 1,256
2021 1,256 512
2020 513 0
Prior 257 259
Total 2,563 2,528
Credit Quality Indicator Prior Year [Abstract]    
2023 35 213
2022 214 288
2021 288 1,256
2020 1,256 512
2019 513 0
Prior 257 259
Total 2,563 2,528
Fair Value    
Schedule of Investments [Line Items]    
Total $ 2,229 $ 2,231
% of Total 100.00% 100.00%
Credit Quality Indicator Current Year [Abstract]    
Total $ 2,229 $ 2,231
Credit Quality Indicator Prior Year [Abstract]    
Total 2,229 2,231
Less than 50.00%    
Schedule of Investments [Line Items]    
Total $ 493 $ 533
% of Total 19.00% 21.00%
Credit Quality Indicator Current Year [Abstract]    
2024 $ 35 $ 85
2023 86 17
2022 17 77
2021 77 232
2020 156 0
Prior 122 122
Total 493 533
Credit Quality Indicator Prior Year [Abstract]    
2023 35 85
2022 86 17
2021 17 77
2020 77 232
2019 156 0
Prior 122 122
Total 493 533
Less than 50.00% | Fair Value    
Schedule of Investments [Line Items]    
Total $ 477 $ 510
% of Total 21.00% 23.00%
Credit Quality Indicator Current Year [Abstract]    
Total $ 477 $ 510
Credit Quality Indicator Prior Year [Abstract]    
Total 477 510
50.00% to 59.99%    
Schedule of Investments [Line Items]    
Total $ 864 $ 764
% of Total 34.00% 30.00%
Credit Quality Indicator Current Year [Abstract]    
2024 $ 0 $ 53
2023 53 149
2022 149 267
2021 292 158
2020 235 0
Prior 135 137
Total 864 764
Credit Quality Indicator Prior Year [Abstract]    
2023 0 53
2022 53 149
2021 149 267
2020 292 158
2019 235 0
Prior 135 137
Total 864 764
50.00% to 59.99% | Fair Value    
Schedule of Investments [Line Items]    
Total $ 754 $ 679
% of Total 34.00% 30.00%
Credit Quality Indicator Current Year [Abstract]    
Total $ 754 $ 679
Credit Quality Indicator Prior Year [Abstract]    
Total 754 679
60.00% to 74.99%    
Schedule of Investments [Line Items]    
Total $ 1,191 $ 1,216
% of Total 46.00% 48.00%
Credit Quality Indicator Current Year [Abstract]    
2024 $ 0 $ 69
2023 69 113
2022 113 912
2021 887 122
2020 122 0
Prior 0 0
Total 1,191 1,216
Credit Quality Indicator Prior Year [Abstract]    
2023 0 69
2022 69 113
2021 113 912
2020 887 122
2019 122 0
Prior 0 0
Total 1,191 1,216
60.00% to 74.99% | Fair Value    
Schedule of Investments [Line Items]    
Total $ 983 $ 1,028
% of Total 44.00% 46.00%
Credit Quality Indicator Current Year [Abstract]    
Total $ 983 $ 1,028
Credit Quality Indicator Prior Year [Abstract]    
Total 983 1,028
75.00% to 84.99%    
Schedule of Investments [Line Items]    
Total $ 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]    
Total $ 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]    
Total 2,477 2,443
Credit Quality Indicator Current Year [Abstract]    
2024 35 154
2023 154 276
2022 276 1,256
2021 1,256 512
2020 513 0
Prior 243 245
Total 2,477 2,443
Credit Quality Indicator Prior Year [Abstract]    
2023 35 154
2022 154 276
2021 276 1,256
2020 1,256 512
2019 513 0
Prior 243 245
Total 2,477 2,443
Greater than 1.25 | Less than 50.00%    
Schedule of Investments [Line Items]    
Total 479 519
Credit Quality Indicator Current Year [Abstract]    
Total 479 519
Credit Quality Indicator Prior Year [Abstract]    
Total 479 519
Greater than 1.25 | 50.00% to 59.99%    
Schedule of Investments [Line Items]    
Total 864 764
Credit Quality Indicator Current Year [Abstract]    
Total 864 764
Credit Quality Indicator Prior Year [Abstract]    
Total 864 764
Greater than 1.25 | 60.00% to 74.99%    
Schedule of Investments [Line Items]    
Total 1,134 1,160
Credit Quality Indicator Current Year [Abstract]    
Total 1,134 1,160
Credit Quality Indicator Prior Year [Abstract]    
Total 1,134 1,160
Greater than 1.25 | 75.00% to 84.99%    
Schedule of Investments [Line Items]    
Total 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]    
Total 63 66
Credit Quality Indicator Current Year [Abstract]    
2024 0 59
2023 60 3
2022 3 0
2021 0 0
2020 0 0
Prior 0 4
Total 63 66
Credit Quality Indicator Prior Year [Abstract]    
2023 0 59
2022 60 3
2021 3 0
2020 0 0
2019 0 0
Prior 0 4
Total 63 66
Greater than 1.00 but less than 1.25 | Less than 50.00%    
Schedule of Investments [Line Items]    
Total 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]    
Total 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 | 60.00% to 74.99%    
Schedule of Investments [Line Items]    
Total 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]    
Total 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]    
Total 23 19
Credit Quality Indicator Current Year [Abstract]    
2024 0 0
2023 0 9
2022 9 0
2021 0 0
2020 0 0
Prior 14 10
Total 23 19
Credit Quality Indicator Prior Year [Abstract]    
2023 0 0
2022 0 9
2021 9 0
2020 0 0
2019 0 0
Prior 14 10
Total 23 19
Less than 1.00 | Less than 50.00%    
Schedule of Investments [Line Items]    
Total 14 10
Credit Quality Indicator Current Year [Abstract]    
Total 14 10
Credit Quality Indicator Prior Year [Abstract]    
Total 14 10
Less than 1.00 | 50.00% to 59.99%    
Schedule of Investments [Line Items]    
Total 0 0
Credit Quality Indicator Current Year [Abstract]    
Total 0 0
Credit Quality Indicator Prior Year [Abstract]    
Total 0 0
Less than 1.00 | 60.00% to 74.99%    
Schedule of Investments [Line Items]    
Total 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]    
Total 9 9
Credit Quality Indicator Current Year [Abstract]    
Total 9 9
Credit Quality Indicator Prior Year [Abstract]    
Total $ 9 $ 9