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Investments (Mortgage Loans by Property Type) (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Jun. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023
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SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Recorded investment | $ 10,652 |  | $ 8,952 |  |  |
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums | (32) |  | (20) |  |  |
Allowance for Loan and Lease Losses, Real Estate | (113) | $ (107) | (93) | $ (87) | $ (75) | $ (67)
Mortgage loans on real estate (net of valuation allowances) | $ 10,507 |  | $ 8,839 |  |  |
Percentage of total | 100.00% |  | 100.00% |  |  |
UNITED STATES |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Percentage of total | 90.90% |  |  |  |  |
CANADA |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Percentage of total | 7.00% |  |  |  |  |
UNITED KINGDOM |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Percentage of total | 2.10% |  |  |  |  |
CALIFORNIA |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Percentage of total | 12.30% |  |  |  |  |
TEXAS |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Percentage of total | 9.70% |  |  |  |  |
WASHINGTON |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Percentage of total | 5.40% |  |  |  |  |
Office building |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Recorded investment | $ 1,810 |  | $ 1,717 |  |  |
Percentage of total | 17.00% |  | 19.20% |  |  |
Retail |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Recorded investment | $ 3,207 |  | $ 2,925 |  |  |
Percentage of total | 30.10% |  | 32.70% |  |  |
Industrial |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Recorded investment | $ 3,499 |  | $ 2,714 |  |  |
Percentage of total | 32.90% |  | 30.30% |  |  |
Apartment |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Recorded investment | $ 1,341 |  | $ 1,121 |  |  |
Percentage of total | 12.60% |  | 12.50% |  |  |
Other commercial |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Recorded investment | $ 101 |  | $ 32 |  |  |
Percentage of total | 0.90% |  | 0.40% |  |  |
Hotel |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Recorded investment | $ 450 |  | $ 443 |  |  |
Percentage of total | 4.20% |  | 4.90% |  |  |
Commercial Real Estate |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Recorded investment | $ 10,408 |  | $ 8,952 |  |  |
Allowance for Loan and Lease Losses, Real Estate | $ (108) | $ (103) | $ (93) | $ (87) | $ (75) | $ (67)
Percentage of total | 97.70% |  | 100.00% |  |  |
Residential Mortgage |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Recorded investment | $ 244 |  | $ 0 |  |  |
Percentage of total | 2.30% |  | 0.00% |  |  |

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