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Investments (Mortgage Loans by Portfolio Segment) (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 | Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Mortgage Loans, Gross | $ 91,262 |  | $ 91,262 |  | $ 93,227 |
Allowance for Credit Loss | (847) | $ (705) | (847) | $ (705) | (721) | $ (527)
Total mortgage loans | $ 90,415 |  | $ 90,415 |  | $ 92,506 |
Percentage Of mortgage total recorded investment To Mortgage Loans On Real Estate Commercial And Consumer Net | 100.90% |  | 100.90% |  | 100.80% |
Percentage of Allowance for Credit Losses for Financing Receivables | (0.90%) |  | (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% |  | 100.00% |
Other Liabilities | $ 38,162 |  | $ 38,162 |  | $ 35,805 |
Investment Income, Investment Expense | 571 | 544 | 1,703 | 1,686 |  |
Loans Originated For Third Party |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Mortgage Loans, Gross | 7,700 |  | 7,700 |  | 8,500 |
Allowance for Credit Loss | (88) |  | (88) |  | (73) |
Other Liabilities | 7,700 |  | 7,700 |  | 8,500 |
Mortgage Income On Loans Originated For Third Party |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross Investment Income, Operating | 87 |  | 272 |  |  |
Mortgage Expense On Loans Originated For Third Party |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Investment Income, Investment Expense | 87 |  | 272 |  |  |
Commercial Mortgage Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Mortgage Loans, Gross | 57,949 |  | 57,949 |  | 60,326 |
Allowance for Credit Loss | $ (551) | (355) | $ (551) | (355) | $ (367) | (218)
Percentage Of Mortgage Loans, Gross | 64.10% |  | 64.10% |  | 65.20% |
Commercial Mortgage Loans | Loans Originated For Third Party |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Mortgage Loans, Gross | $ 7,500 |  | $ 7,500 |  | $ 8,200 |
Residential Mortgage Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Mortgage Loans, Gross | 13,844 |  | 13,844 |  | 13,096 |
Allowance for Credit Loss | $ (161) | (192) | $ (161) | (192) | $ (182) | (190)
Percentage Of Mortgage Loans, Gross | 15.30% |  | 15.30% |  | 14.20% |
Agricultural Mortgage Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Mortgage Loans, Gross | $ 19,469 |  | $ 19,469 |  | $ 19,805 |
Allowance for Credit Loss | $ (135) | $ (158) | $ (135) | $ (158) | $ (172) | $ (119)
Percentage Of Mortgage Loans, Gross | 21.50% |  | 21.50% |  | 21.40% |
Agricultural Mortgage Loans | Loans Originated For Third Party |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Mortgage Loans, Gross | $ 259 |  | $ 259 |  | $ 246 |

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