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Investments (Mortgage Loans by Portfolio Segment) (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Mortgage Loans, Gross | $ 92,272 |  | $ 93,227 |
Allowance for Credit Loss | (814) | $ (692) | (721) | $ (527)
Total mortgage loans | $ 91,458 |  | $ 92,506 |
Percentage Of mortgage total recorded investment To Mortgage Loans On Real Estate Commercial And Consumer Net | 100.90% |  | 100.80% |
Percentage of Allowance for Credit Losses for Financing Receivables | (0.90%) |  | (0.80%) |
Percentage Of Mortgage Loans On Real Estate To Mortgage Loans On Real Estate Commercial And Consumer Net | 100.00% |  | 100.00% |
Other liabilities | $ 36,158 |  | $ 35,805 |
Investment Income, Investment Expense | 568 | 461 |  |
Loans Originated For Third Party |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Mortgage Loans, Gross | 8,100 |  | 8,500 |
Allowance for Credit Loss | (77) |  | (73) |
Other liabilities | 8,100 |  | 8,500 |
Mortgage Income On Loans Originated For Third Party |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross Investment Income, Operating | 94 |  |  |
Mortgage Expense On Loans Originated For Third Party |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Investment Income, Investment Expense | 94 |  |  |
Commercial Mortgage Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Mortgage Loans, Gross | 59,359 |  | 60,326 |
Allowance for Credit Loss | $ (461) | (319) | $ (367) | (218)
Percentage Of Mortgage Loans, Gross | 64.90% |  | 65.20% |
Commercial Mortgage Loans | Loans Originated For Third Party |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Mortgage Loans, Gross | $ 7,800 |  | $ 8,200 |
Residential Mortgage Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Mortgage Loans, Gross | 13,201 |  | 13,096 |
Allowance for Credit Loss | $ (165) | (212) | $ (182) | (190)
Percentage Of Mortgage Loans, Gross | 14.40% |  | 14.20% |
Agricultural Mortgage Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Mortgage Loans, Gross | $ 19,712 |  | $ 19,805 |
Allowance for Credit Loss | $ (188) | $ (161) | $ (172) | $ (119)
Percentage Of Mortgage Loans, Gross | 21.60% |  | 21.40% |
Agricultural Mortgage Loans | Loans Originated For Third Party |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Mortgage Loans, Gross | $ 251 |  | $ 246 |

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