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Investments (Mortgage Loans - Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums | $ (821) |  | $ (821) |  | $ (879)
Financing Receivable, Purchase | $ 797 | $ 263 | $ 1,700 | $ 747 |
Percentage of Mortgage Loans Classified as Performing | 98.00% |  | 98.00% |  | 98.00%
Mortgage Loans Exchanged for Real Estate Joint Venture | $ 172 |  | $ 172 |  |
Mortgage Loans Contributed To Real Estate Joint Ventures |  | 218 |  | 218 |
Commercial Mortgage Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Interest Receivable | 235 |  | 235 |  | $ 249
Commercial Mortgage Loans | Extended Maturity |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Amortized Cost of Mortgage Loans Foreclosed during the period |  | $ 182 |  |  |
Amortized Cost of Mortgage Loans Delinquent during the period |  |  |  | $ 182 |
Residential Mortgage Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Interest Receivable | 126 |  | 126 |  | 117
Agricultural Mortgage Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Interest Receivable | $ 189 |  | $ 189 |  | $ 199

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