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Investments - Schedule of Commercial Mortgage Loan Investment (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024 | Mar. 31, 2024 | Dec. 31, 2023
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Schedule of Investments [Line Items] |  |  |  |
Allowance for expected loan loss | $ (73) | $ (70) | $ (67) | $ (66)
Total CMLs, net of valuation allowance | 6,366 | 5,926 |  |
Commercial Mortgage |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Total CMLs, gross of valuation allowance | 2,805 | 2,722 |  |
Allowance for expected loan loss | (17) | (17) | $ (13) | $ (12)
Total CMLs, net of valuation allowance | $ 2,788 | $ 2,705 |  |
% of Total | 100.00% | 100.00% |  |
East North Central | Commercial Mortgage |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Total CMLs, gross of valuation allowance | $ 99 | $ 98 |  |
% of Total | 4.00% | 4.00% |  |
East South Central | Commercial Mortgage |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Total CMLs, gross of valuation allowance | $ 75 | $ 75 |  |
% of Total | 3.00% | 3.00% |  |
Middle Atlantic | Commercial Mortgage |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Total CMLs, gross of valuation allowance | $ 348 | $ 354 |  |
% of Total | 12.00% | 13.00% |  |
Mountain | Commercial Mortgage |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Total CMLs, gross of valuation allowance | $ 409 | $ 409 |  |
% of Total | 15.00% | 15.00% |  |
New England | Commercial Mortgage |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Total CMLs, gross of valuation allowance | $ 164 | $ 164 |  |
% of Total | 6.00% | 6.00% |  |
Pacific | Commercial Mortgage |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Total CMLs, gross of valuation allowance | $ 726 | $ 706 |  |
% of Total | 26.00% | 26.00% |  |
South Atlantic | Commercial Mortgage |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Total CMLs, gross of valuation allowance | $ 742 | $ 683 |  |
% of Total | 26.00% | 25.00% |  |
West North Central | Commercial Mortgage |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Total CMLs, gross of valuation allowance | $ 62 | $ 62 |  |
% of Total | 2.00% | 2.00% |  |
West South Central | Commercial Mortgage |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Total CMLs, gross of valuation allowance | $ 180 | $ 171 |  |
% of Total | 6.00% | 6.00% |  |
Hotel | Commercial Mortgage |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Total CMLs, gross of valuation allowance | $ 17 | $ 17 |  |
% of Total | 1.00% | 1.00% |  |
Industrial | Commercial Mortgage |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Total CMLs, gross of valuation allowance | $ 657 | $ 657 |  |
% of Total | 23.00% | 24.00% |  |
Mixed Use | Commercial Mortgage |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Total CMLs, gross of valuation allowance | $ 11 | $ 11 |  |
% of Total | 0.00% | 0.00% |  |
Multifamily | Commercial Mortgage |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Total CMLs, gross of valuation allowance | $ 1,024 | $ 1,006 |  |
% of Total | 37.00% | 37.00% |  |
Office | Commercial Mortgage |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Total CMLs, gross of valuation allowance | $ 349 | $ 349 |  |
% of Total | 12.00% | 13.00% |  |
Retail | Commercial Mortgage |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Total CMLs, gross of valuation allowance | $ 75 | $ 98 |  |
% of Total | 3.00% | 4.00% |  |
Student Housing | Commercial Mortgage |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Total CMLs, gross of valuation allowance | $ 83 | $ 83 |  |
% of Total | 3.00% | 3.00% |  |
Other | Commercial Mortgage |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Total CMLs, gross of valuation allowance | $ 589 | $ 501 |  |
% of Total | 21.00% | 18.00% |  |

X
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