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Investments (Mortgage Loans by Property Type) (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | --- | ---
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Recorded investment | $ 9,441 | $ 8,952 |
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums | (21) | (20) |
Allowance for Loan and Lease Losses, Real Estate | (89) | (93) | $ (67)
Mortgage loans on real estate (net of valuation allowances) | $ 9,331 | $ 8,839 |
Percentage of total | 100.00% | 100.00% |
Office building |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Recorded investment | $ 1,696 | $ 1,717 |
Percentage of total | 17.90% | 19.20% |
Retail |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Recorded investment | $ 2,944 | $ 2,925 |
Percentage of total | 31.20% | 32.70% |
Industrial |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Recorded investment | $ 2,963 | $ 2,714 |
Percentage of total | 31.40% | 30.30% |
Apartment |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Recorded investment | $ 1,213 | $ 1,121 |
Percentage of total | 12.80% | 12.50% |
Other commercial |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Recorded investment | $ 102 | $ 32 |
Percentage of total | 1.10% | 0.40% |
Hotel |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Recorded investment | $ 441 | $ 443 |
Percentage of total | 4.70% | 4.90% |
Commercial Real Estate |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Recorded investment | $ 9,359 | $ 8,952 |
Percentage of total | 99.10% | 100.00% |
Residential Mortgage |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Recorded investment | $ 82 | $ 0 |
Allowance for Loan and Lease Losses, Real Estate | $ (2) |  |
Percentage of total | 0.90% |  |

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