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Investments (Mortgage Loans - Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums | $ (736) | $ (744) |
Financing Receivable, Purchase | 1,500 | 3,100 | $ 1,800
Mortgage Loans Contributed To Joint Ventures | 15 | 489 |
Amortized Cost Of Mortgage Loans Foreclosed | 37 | 467 |
Gain On Mortgage Loans Foreclosure |  | 34 |
Mortgage Loans, Gross | $ 93,227 | $ 84,290 |
Percentage of mortgage loans with LTV ratio in excess of 100% | 2.00% |  |
Percentage of Mortgage Loans Classified as Performing | 99.00% | 99.00% |
Commercial Mortgage Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Interest Receivable | $ 277 | $ 219 |
Mortgage Loans, Gross | 60,326 | 52,502 |
Commercial Mortgage Loans | Reinsurance Risk Transfer Transaction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Sale | 254 |  |
Gain (Loss) on Sale of Financing Receivable | 58 |  |
Residential Mortgage Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Interest Receivable | 95 | 81 |
Mortgage Loans, Gross | 13,096 | 12,482 |
Agricultural Mortgage Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Interest Receivable | 204 | 176 |
Mortgage Loans, Gross | 19,805 | $ 19,306 |
Mortgage Loans with LTV ratio in excess of 100% [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Mortgage Loans, Gross | $ 1,600 |  |

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