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Investments (Mortgage Loans - Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021 | Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums | $ (695) |  | $ (695) |  | $ (759) |
Financing Receivable, Purchase | 868 | $ 532 | 1,700 | $ 986 |  |
Mortgage Loans, Gross | $ 82,408 |  | $ 82,408 |  | $ 79,860 |
Percentage of Mortgage Loans Classified as Performing | 99.00% |  | 99.00% |  | 99.00% |
Financing Receivable, Nonaccrual | $ 822 |  | $ 822 |  | $ 822 |
Commercial Mortgage Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Interest Receivable | 190 |  | 190 |  | 180 |
Mortgage Loans, Gross | 52,348 |  | 52,348 |  | 50,553 |
Financing Receivable, Nonaccrual | 180 |  | 180 |  | 155 | $ 317
Financing Receivable, Nonaccrual, No Allowance | 0 |  | 0 |  | 0 |
Residential Mortgage Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Interest Receivable | 81 |  | 81 |  | 86 |
Mortgage Loans, Gross | 11,497 |  | 11,497 |  | 11,196 |
Financing Receivable, Nonaccrual | 464 |  | 464 |  | 442 | 534
Financing Receivable, Nonaccrual, No Allowance | 0 |  | 0 |  | 0 |
Agricultural Mortgage Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Interest Receivable | 152 |  | 152 |  | 161 |
Mortgage Loans, Gross | 18,563 |  | 18,563 |  | 18,111 |
Financing Receivable, Nonaccrual | 178 |  | 178 |  | 225 | $ 266
Financing Receivable, Nonaccrual, No Allowance | $ 86 |  | $ 86 |  | $ 134 |
Maximum |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage of mortgage loans with LTV ratio in excess of 100% | 1.00% |  | 1.00% |  |  |
Mortgage Loans with LTV ratio in excess of 100% [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Mortgage Loans, Gross | $ 507 |  | $ 507 |  |  |

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