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Investments - Schedule of Investment in CMLs by Loan to Value and Debt Service Coverage Ratios (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Schedule of Investments [Line Items]    
Loans under development, amortized cost $ 21  
Loans under development, fair value 21  
Commercial mortgage loans    
Schedule of Investments [Line Items]    
Total $ 2,513 $ 2,407
% of Total 100.00% 100.00%
Loans under development, amortized cost $ 9 $ 9
Loans under development, fair value 9 9
Credit Quality Indicator Current Year [Abstract]    
2023 171 341
2022 327 1,300
2021 1,145 488
2020 599 0
2019 0 0
Prior 271 278
Total 2,513 2,407
Credit Quality Indicator Prior Year [Abstract]    
2022 171 341
2021 327 1,300
2020 1,145 488
2019 599 0
2018 0 0
Prior 271 278
Total 2,513 2,407
Commercial mortgage loans | Fair Value    
Schedule of Investments [Line Items]    
Total $ 2,127 $ 2,074
% of Total 100.00% 100.00%
Credit Quality Indicator Current Year [Abstract]    
Total $ 2,127 $ 2,074
Credit Quality Indicator Prior Year [Abstract]    
Total 2,127 2,074
Commercial mortgage loans | Less than 50.00%    
Schedule of Investments [Line Items]    
Total $ 541 $ 526
% of Total 22.00% 22.00%
Credit Quality Indicator Current Year [Abstract]    
2023 $ 52 $ 70
2022 111 120
2021 157 207
2020 97 0
2019 0 0
Prior 124 129
Total 541 526
Credit Quality Indicator Prior Year [Abstract]    
2022 52 70
2021 111 120
2020 157 207
2019 97 0
2018 0 0
Prior 124 129
Total 541 526
Commercial mortgage loans | Less than 50.00% | Fair Value    
Schedule of Investments [Line Items]    
Total $ 505 $ 490
% of Total 24.00% 24.00%
Credit Quality Indicator Current Year [Abstract]    
Total $ 505 $ 490
Credit Quality Indicator Prior Year [Abstract]    
Total 505 490
Commercial mortgage loans | 50.00% to 59.99%    
Schedule of Investments [Line Items]    
Total $ 765 $ 706
% of Total 31.00% 29.00%
Credit Quality Indicator Current Year [Abstract]    
2023 $ 78 $ 149
2022 126 268
2021 294 158
2020 129 0
2019 0 0
Prior 138 131
Total 765 706
Credit Quality Indicator Prior Year [Abstract]    
2022 78 149
2021 126 268
2020 294 158
2019 129 0
2018 0 0
Prior 138 131
Total 765 706
Commercial mortgage loans | 50.00% to 59.99% | Fair Value    
Schedule of Investments [Line Items]    
Total $ 654 $ 615
% of Total 31.00% 30.00%
Credit Quality Indicator Current Year [Abstract]    
Total $ 654 $ 615
Credit Quality Indicator Prior Year [Abstract]    
Total 654 615
Commercial mortgage loans | 60.00% to 74.99%    
Schedule of Investments [Line Items]    
Total $ 1,187 $ 1,157
% of Total 47.00% 48.00%
Credit Quality Indicator Current Year [Abstract]    
2023 $ 39 $ 113
2022 81 912
2021 694 123
2020 373 0
2019 0 0
Prior 0 9
Total 1,187 1,157
Credit Quality Indicator Prior Year [Abstract]    
2022 39 113
2021 81 912
2020 694 123
2019 373 0
2018 0 0
Prior 0 9
Total 1,187 1,157
Commercial mortgage loans | 60.00% to 74.99% | Fair Value    
Schedule of Investments [Line Items]    
Total $ 952 $ 955
% of Total 45.00% 45.00%
Credit Quality Indicator Current Year [Abstract]    
Total $ 952 $ 955
Credit Quality Indicator Prior Year [Abstract]    
Total 952 955
Commercial mortgage loans | 75.00% to 84.99%    
Schedule of Investments [Line Items]    
Total $ 11 $ 18
% of Total 0.00% 1.00%
Credit Quality Indicator Current Year [Abstract]    
2023 $ 2 $ 9
2022 9 0
2021 0 0
2020 0 0
2019 0 0
Prior 0 9
Total 11 18
Credit Quality Indicator Prior Year [Abstract]    
2022 2 9
2021 9 0
2020 0 0
2019 0 0
2018 0 0
Prior 0 9
Total 11 18
Commercial mortgage loans | 75.00% to 84.99% | Fair Value    
Schedule of Investments [Line Items]    
Total $ 10 $ 14
% of Total 0.00% 1.00%
Credit Quality Indicator Current Year [Abstract]    
Total $ 10 $ 14
Credit Quality Indicator Prior Year [Abstract]    
Total 10 14
Greater than 1.25 | Commercial mortgage loans    
Schedule of Investments [Line Items]    
Total 2,452 2,371
Credit Quality Indicator Current Year [Abstract]    
2023 146 329
2022 315 1,300
2021 1,145 488
2020 599 0
2019 0 0
Prior 247 254
Total 2,452 2,371
Credit Quality Indicator Prior Year [Abstract]    
2022 146 329
2021 315 1,300
2020 1,145 488
2019 599 0
2018 0 0
Prior 247 254
Total 2,452 2,371
Greater than 1.25 | Commercial mortgage loans | Less than 50.00%    
Schedule of Investments [Line Items]    
Total 527 511
Credit Quality Indicator Current Year [Abstract]    
Total 527 511
Credit Quality Indicator Prior Year [Abstract]    
Total 527 511
Greater than 1.25 | Commercial mortgage loans | 50.00% to 59.99%    
Schedule of Investments [Line Items]    
Total 765 706
Credit Quality Indicator Current Year [Abstract]    
Total 765 706
Credit Quality Indicator Prior Year [Abstract]    
Total 765 706
Greater than 1.25 | Commercial mortgage loans | 60.00% to 74.99%    
Schedule of Investments [Line Items]    
Total 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 loans | 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 | Commercial mortgage loans    
Schedule of Investments [Line Items]    
Total 33 7
Credit Quality Indicator Current Year [Abstract]    
2023 25 3
2022 3 0
2021 0 0
2020 0 0
2019 0 0
Prior 5 4
Total 33 7
Credit Quality Indicator Prior Year [Abstract]    
2022 25 3
2021 3 0
2020 0 0
2019 0 0
2018 0 0
Prior 5 4
Total 33 7
Greater than 1.00 but less than 1.25 | Commercial mortgage loans | Less than 50.00%    
Schedule of Investments [Line Items]    
Total 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 loans | 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 | Commercial mortgage loans | 60.00% to 74.99%    
Schedule of Investments [Line Items]    
Total 27 3
Credit Quality Indicator Current Year [Abstract]    
Total 27 3
Credit Quality Indicator Prior Year [Abstract]    
Total 27 3
Greater than 1.00 but less than 1.25 | Commercial mortgage loans | 75.00% to 84.99%    
Schedule of Investments [Line Items]    
Total 2 0
Credit Quality Indicator Current Year [Abstract]    
Total 2 0
Credit Quality Indicator Prior Year [Abstract]    
Total 2 0
Less than 1.00 | Commercial mortgage loans    
Schedule of Investments [Line Items]    
Total 28 29
Credit Quality Indicator Current Year [Abstract]    
2023 0 9
2022 9 0
2021 0 0
2020 0 0
2019 0 0
Prior 19 20
Total 28 29
Credit Quality Indicator Prior Year [Abstract]    
2022 0 9
2021 9 0
2020 0 0
2019 0 0
2018 0 0
Prior 19 20
Total 28 29
Less than 1.00 | Commercial mortgage loans | Less than 50.00%    
Schedule of Investments [Line Items]    
Total 10 11
Credit Quality Indicator Current Year [Abstract]    
Total 10 11
Credit Quality Indicator Prior Year [Abstract]    
Total 10 11
Less than 1.00 | Commercial mortgage loans | 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 | Commercial mortgage loans | 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 | Commercial mortgage loans | 75.00% to 84.99%    
Schedule of Investments [Line Items]    
Total 9 18
Credit Quality Indicator Current Year [Abstract]    
Total 9 18
Credit Quality Indicator Prior Year [Abstract]    
Total $ 9 $ 18