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Investments - Schedule of Commercial Mortgage Loan Investment (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Schedule of Investments [Line Items] |  |  |  |
Allowance for credit loss | $ (67) | $ (66) | $ (60) | $ (42)
Total mortgage loans | 5,440 | 5,336 |  |
Commercial mortgage loans |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized Cost | 2,563 | 2,550 |  |
Allowance for credit loss | (13) | (12) | $ (12) | $ (10)
Total mortgage loans | $ 2,550 | $ 2,538 |  |
% of Total | 100.00% | 100.00% |  |
East North Central | Commercial mortgage loans |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized Cost | $ 104 | $ 151 |  |
% of Total | 4.00% | 6.00% |  |
East South Central | Commercial mortgage loans |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized Cost | $ 75 | $ 75 |  |
% of Total | 3.00% | 3.00% |  |
Middle Atlantic | Commercial mortgage loans |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized Cost | $ 354 | $ 354 |  |
% of Total | 14.00% | 14.00% |  |
Mountain | Commercial mortgage loans |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized Cost | $ 386 | $ 352 |  |
% of Total | 15.00% | 14.00% |  |
New England | Commercial mortgage loans |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized Cost | $ 92 | $ 168 |  |
% of Total | 3.00% | 6.00% |  |
Pacific | Commercial mortgage loans |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized Cost | $ 765 | $ 766 |  |
% of Total | 30.00% | 30.00% |  |
South Atlantic | Commercial mortgage loans |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized Cost | $ 618 | $ 563 |  |
% of Total | 24.00% | 22.00% |  |
West North Central | Commercial mortgage loans |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized Cost | $ 21 | $ 4 |  |
% of Total | 1.00% | 0.00% |  |
West South Central | Commercial mortgage loans |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized Cost | $ 148 | $ 117 |  |
% of Total | 6.00% | 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 | $ 617 | $ 616 |  |
% of Total | 24.00% | 24.00% |  |
Mixed Use Property | Commercial mortgage loans |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized Cost | $ 11 | $ 11 |  |
% of Total | 0.00% | 0.00% |  |
Multifamily | Commercial mortgage loans |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized Cost | $ 1,012 | $ 1,012 |  |
% of Total | 39.00% | 40.00% |  |
Office | Commercial mortgage loans |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized Cost | $ 315 | $ 316 |  |
% of Total | 13.00% | 13.00% |  |
Retail | Commercial mortgage loans |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized Cost | $ 101 | $ 102 |  |
% of Total | 4.00% | 4.00% |  |
Student Housing | Commercial mortgage loans |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized Cost | $ 83 | $ 392 |  |
% of Total | 3.00% | 15.00% |  |
Other | Commercial mortgage loans |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized Cost | $ 406 | $ 83 |  |
% of Total | 16.00% | 3.00% |  |

X
- Definition Percentage, before allowance for credit loss, of financing receivable to total financing receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (c) -Publisher SEC + Details
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