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Investments (Mortgage Loans - Narrative) (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 USD ($) Contracts | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums | $ (744) | $ (759) |
Financing Receivable, Purchase | 3,100 | 1,800 | $ 3,300
Mortgage Loans, Gross | $ 84,290 | $ 79,860 |
Percentage of Mortgage Loans Classified as Performing | 99.00% | 99.00% |
Financing Receivable, Nonaccrual | $ 762 | $ 822 |
Mortgage Loans Contributed To Joint Ventures | 489 |  |
Amortized Cost Of Mortgage Loans Foreclosed | 467 |  |
Gain On Mortgage Loans Foreclosure | 34 |  |
Commercial Mortgage Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Interest Receivable | 219 | 180 |
Mortgage Loans, Gross | 52,502 | 50,553 |
Financing Receivable, Nonaccrual | 169 | 155 | 317
Financing Receivable, Nonaccrual, No Allowance | $ 0 | 0 |
Financing Receivable, Modifications, Number of Contracts | Contracts | 2 |  |
Financing Receivable, Troubled Debt Restructuring, Premodification | $ 162 |  |
Financing Receivable, Troubled Debt Restructuring, Postmodification | 162 |  |
Residential Mortgage Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Interest Receivable | 81 | 86 |
Mortgage Loans, Gross | 12,482 | 11,196 |
Financing Receivable, Nonaccrual | 462 | 442 | 534
Financing Receivable, Nonaccrual, No Allowance | 0 | 0 |
Agricultural Mortgage Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Interest Receivable | 176 | 161 |
Mortgage Loans, Gross | 19,306 | 18,111 |
Financing Receivable, Nonaccrual | 131 | 225 | $ 266
Financing Receivable, Nonaccrual, No Allowance | $ 7 | $ 134 |
Maximum |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Percentage of mortgage loans with LTV ratio in excess of 100% | 1.00% |  |
Mortgage Loans with LTV ratio in excess of 100% [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Mortgage Loans, Gross | $ 732 |  |

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