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Investments (Mortgage Loans - Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums | $ (863) |  | $ (863) |  | $ (736)
Financing Receivable, Purchase | 753 | $ 221 | 1,500 | $ 1,200 |
Financing Receivable, Sale | $ 168 |  | 168 |  |
Mortgage Loans Contributed To Joint Ventures |  |  | $ 218 |  |
Percentage of Mortgage Loans Classified as Performing | 98.00% |  | 98.00% |  | 99.00%
Commercial Mortgage Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Interest Receivable | $ 269 |  | $ 269 |  | $ 277
Amortized Cost of Mortgage Loans Delinquent during the period |  |  | 182 |  |
Residential Mortgage Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Interest Receivable | 104 |  | 104 |  | 95
Agricultural Mortgage Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Interest Receivable | $ 189 |  | $ 189 |  | $ 204

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