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INVESTMENTS - Commercial Mortgage and Other Loans by Portfolio Segment (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | --- | --- | --- | --- | ---
Participating Mortgage Loans [Line Items] |  |  |  |  |  |
Commercial mortgage and other loans, gross | $ 13,641 |  | $ 11,960 |  |  |
Percent of total commercial mortgage and other loans | 100.00% |  | 100.00% |  |  |
Allowance for credit losses | $ (182) |  | $ (174) |  |  |
Total net commercial mortgage and other loans | 13,459 |  | 11,786 |  |  |
Transitional real estate loans |  |  |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |  |  |
Commercial mortgage and other loans, gross | $ 6,502 |  | $ 5,359 |  |  |
Percent of total commercial mortgage and other loans | 47.60% |  | 44.70% |  |  |
Allowance for credit losses | $ (55) | $ (53) | $ (68) | $ (59) | $ (41) | $ (63)
Commercial mortgage loans |  |  |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |  |  |
Commercial mortgage and other loans, gross | $ 2,027 |  | $ 1,904 |  |  |
Percent of total commercial mortgage and other loans | 14.90% |  | 15.90% |  |  |
Allowance for credit losses | $ (10) | (8) | $ (10) | (17) | (22) | (32)
Middle market loans |  |  |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |  |  |
Commercial mortgage and other loans, gross | $ 5,112 |  | $ 4,697 |  |  |
Percent of total commercial mortgage and other loans | 37.50% |  | 39.40% |  |  |
Allowance for credit losses | $ (117) | $ (109) | $ (96) | $ (89) | $ (76) | $ (85)
Office | Transitional real estate loans |  |  |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |  |  |
Commercial mortgage and other loans, gross | $ 2,121 |  | $ 2,001 |  |  |
Percent of total commercial mortgage and other loans | 15.50% |  | 16.70% |  |  |
Office | Commercial mortgage loans |  |  |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |  |  |
Commercial mortgage and other loans, gross | $ 390 |  | $ 398 |  |  |
Percent of total commercial mortgage and other loans | 2.90% |  | 3.30% |  |  |
Retail | Transitional real estate loans |  |  |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |  |  |
Commercial mortgage and other loans, gross | $ 485 |  | $ 267 |  |  |
Percent of total commercial mortgage and other loans | 3.60% |  | 2.20% |  |  |
Retail | Commercial mortgage loans |  |  |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |  |  |
Commercial mortgage and other loans, gross | $ 312 |  | $ 332 |  |  |
Percent of total commercial mortgage and other loans | 2.30% |  | 2.80% |  |  |
Apartment/Multi-Family | Transitional real estate loans |  |  |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |  |  |
Commercial mortgage and other loans, gross | $ 2,730 |  | $ 1,893 |  |  |
Percent of total commercial mortgage and other loans | 20.00% |  | 15.80% |  |  |
Apartment/Multi-Family | Commercial mortgage loans |  |  |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |  |  |
Commercial mortgage and other loans, gross | $ 634 |  | $ 649 |  |  |
Percent of total commercial mortgage and other loans | 4.60% |  | 5.40% |  |  |
Industrial | Transitional real estate loans |  |  |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |  |  |
Commercial mortgage and other loans, gross | $ 154 |  | $ 94 |  |  |
Percent of total commercial mortgage and other loans | 1.10% |  | 0.80% |  |  |
Industrial | Commercial mortgage loans |  |  |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |  |  |
Commercial mortgage and other loans, gross | $ 691 |  | $ 525 |  |  |
Percent of total commercial mortgage and other loans | 5.10% |  | 4.40% |  |  |
Hospitality | Transitional real estate loans |  |  |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |  |  |
Commercial mortgage and other loans, gross | $ 835 |  | $ 876 |  |  |
Percent of total commercial mortgage and other loans | 6.10% |  | 7.30% |  |  |
Other | Transitional real estate loans |  |  |  |  |  |
Participating Mortgage Loans [Line Items] |  |  |  |  |  |
Commercial mortgage and other loans, gross | $ 177 |  | $ 228 |  |  |
Percent of total commercial mortgage and other loans | 1.30% |  | 1.90% |  |  |

X
- Definition Percent of amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References No definition available. + Details
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