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Mortgage Loans on Real Estate - Narrative (Details) | 12 Months Ended
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Dec. 31, 2024 USD ($) segment loan | Dec. 31, 2023 USD ($) loan | Dec. 31, 2022 USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Financing receivable, number of portfolio segments | segment | 2 |  |
Financing Receivable, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] | Accrued investment income |  |
Total, net of allowance | $ 99,000,000 | $ 27,000,000 |
Financing receivable, modified in period, amount | 260,000,000 | 219,000,000 |
Mortgage loans on real estate, net of allowance |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Commercial mortgage loans, carrying value | 12,117,000,000 | 5,658,000,000 |
Financing receivable, accrued interest, writeoff | $ 3,000,000 | $ 0 |
Financing receivable, threshold period, nonperforming | 90 days |  |
Financing receivable, nonaccrual, number of loans | loan | 263 | 3 |
Interest income recognized on loans in non-accrual status | $ 2,000,000 | $ 2,000,000 | $ 0
Mortgage loans on real estate, net of allowance | Residential Mortgage |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Commercial mortgage loans, carrying value | $ 2,687,000,000 | $ 0 |

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