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Investments (Mortgage Loans by Property Type) (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021
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SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Recorded investment | $ 7,320 |  | $ 6,653 |  |  |
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums | (15) |  | (12) |  |  |
Allowance for Loan and Lease Losses, Real Estate | (74) | $ (57) | (51) | $ (43) | $ (38) | $ (35)
Mortgage loans on real estate (net of valuation allowances) | $ 7,231 |  | $ 6,590 |  |  |
Percentage of total | 100.00% |  | 100.00% |  |  |
Office building |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Recorded investment | $ 1,716 |  | $ 1,706 |  |  |
Percentage of total | 23.40% |  | 25.60% |  |  |
Retail |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Recorded investment | $ 2,445 |  | $ 2,290 |  |  |
Percentage of total | 33.40% |  | 34.40% |  |  |
Industrial |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Recorded investment | $ 1,820 |  | $ 1,518 |  |  |
Percentage of total | 24.90% |  | 22.80% |  |  |
Apartment |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Recorded investment | $ 870 |  | $ 763 |  |  |
Percentage of total | 11.90% |  | 11.50% |  |  |
Other commercial |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Recorded investment | $ 469 |  | $ 376 |  |  |
Percentage of total | 6.40% |  | 5.70% |  |  |

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- Definition The amount represents the total percentage of each property type in comparison to the total of mortgage loans whose balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio. + References No definition available. + Details
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