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Investments - Schedule of Commercial Mortgage Loan Investment (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021
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Schedule of Investments [Line Items] |  |  |  |  |  |
Allowance for credit loss | $ (64) | $ (60) | $ (42) | $ (35) | $ (32) | $ (31)
Total mortgage loans | 5,076 |  | 4,554 |  |  |
Commercial mortgage loans |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Amortized Cost | 2,470 |  | 2,416 |  |  |
Allowance for credit loss | (13) | $ (12) | (10) | $ (6) | $ (6) | $ (6)
Total mortgage loans | $ 2,457 |  | $ 2,406 |  |  |
% of Total | 100.00% |  | 100.00% |  |  |
East North Central | Commercial mortgage loans |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Amortized Cost | $ 150 |  | $ 151 |  |  |
% of Total | 6.00% |  | 6.00% |  |  |
East South Central | Commercial mortgage loans |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Amortized Cost | $ 76 |  | $ 76 |  |  |
% of Total | 3.00% |  | 3.00% |  |  |
Middle Atlantic | Commercial mortgage loans |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Amortized Cost | $ 325 |  | $ 326 |  |  |
% of Total | 13.00% |  | 13.00% |  |  |
Mountain | Commercial mortgage loans |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Amortized Cost | $ 353 |  | $ 355 |  |  |
% of Total | 14.00% |  | 15.00% |  |  |
New England | Commercial mortgage loans |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Amortized Cost | $ 166 |  | $ 158 |  |  |
% of Total | 7.00% |  | 7.00% |  |  |
Pacific | Commercial mortgage loans |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Amortized Cost | $ 726 |  | $ 708 |  |  |
% of Total | 29.00% |  | 28.00% |  |  |
South Atlantic | Commercial mortgage loans |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Amortized Cost | $ 553 |  | $ 521 |  |  |
% of Total | 22.00% |  | 22.00% |  |  |
West North Central | Commercial mortgage loans |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Amortized Cost | $ 4 |  | $ 4 |  |  |
% of Total | 1.00% |  | 1.00% |  |  |
West South Central | Commercial mortgage loans |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Amortized Cost | $ 117 |  | $ 117 |  |  |
% of Total | 5.00% |  | 5.00% |  |  |
Hotel | Commercial mortgage loans |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Amortized Cost | $ 18 |  | $ 18 |  |  |
% of Total | 1.00% |  | 1.00% |  |  |
Industrial | Commercial mortgage loans |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Amortized Cost | $ 538 |  | $ 520 |  |  |
% of Total | 22.00% |  | 22.00% |  |  |
Mixed Use Property | Commercial mortgage loans |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Amortized Cost | $ 12 |  | $ 12 |  |  |
% of Total | 1.00% |  | 1.00% |  |  |
Multifamily | Commercial mortgage loans |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Amortized Cost | $ 1,012 |  | $ 1,013 |  |  |
% of Total | 41.00% |  | 42.00% |  |  |
Office | Commercial mortgage loans |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Amortized Cost | $ 328 |  | $ 330 |  |  |
% of Total | 13.00% |  | 14.00% |  |  |
Retail | Commercial mortgage loans |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Amortized Cost | $ 103 |  | $ 105 |  |  |
% of Total | 4.00% |  | 4.00% |  |  |
Student Housing | Commercial mortgage loans |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Amortized Cost | $ 83 |  | $ 83 |  |  |
% of Total | 3.00% |  | 3.00% |  |  |
Other | Commercial mortgage loans |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Amortized Cost | $ 376 |  | $ 335 |  |  |
% of Total | 15.00% |  | 13.00% |  |  |

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